Positive Displacement Flow meter Technology

What is a Positive Displacement Flow meter?

Positive displacement flow meters are referred to as PD flow meters or PDF. They are the most accurate type in flow meters. Volumetric flow measurement uses a fixed small volume to repeatedly measure the volume of fluid passing through the flowmeter. It uses mechanical measuring elements to continuously divide the fluid into a single known volume part. The total flow volume is measured according to the number of times that the metering chamber is filled and discharged with the volume part of the fluid successively and repeatedly.

Positive Displacement Flow meter Technology

Positive Displacement Flow Meter Working Principle

In principle, PDF is a hydraulic engine that absorbs a small amount of energy from the fluid. This energy is used to overcome the frictional force of the flow detection element and the rotation of the accessories. At the same time, a pressure drop is formed at the inflow and outflow ends of the meter.

The working principle of a typical PDF (gear type) is shown in Figure 1.

The two shank round gears have a special shape that rolls to each other and rotates in contact.
P1 and p2 represent the inlet pressure and the outlet pressure respectively, obviously p1>p2.

Figure 1(a) The lower gear is under the action of the two pressure differences. Produce counterclockwise rotation, which is the driving wheel;
The upper gear has equal pressure on both sides. It does not produce a large rotating moment and is a driven wheel. Driven by the lower gear, it rotates clockwise.

In the position of Figure 1(b), both gears generate a rotational torque under the action of differential pressure and continue to rotate.

When rotating to the position in Figure 1(c), the upper gear becomes the driving wheel. The lower gear becomes the driven wheel. Continue to rotate to the same position as Figure 1(a) to complete a cycle.

One cycle action discharges the fluid volume of the four crescent-shaped cavities enclosed by the gear and the shell wall. This volume is called the “circulation volume” of the flow meter.

Suppose the circulation volume of the flow meter is u, and the number of gear rotations in a certain period of time is N. Then the volume of fluid flowing through the flowmeter during this time is V,

Then V=Nu(1)

The rotation of the Nanyuan gear is transmitted to the counter through the magnetic seal coupling and the transmission reduction mechanism to directly indicate the total amount flowing through the flowmeter.

If the sending device is attached and then equipped with an electric display instrument, it can realize that the remote transmission is only the instantaneous flow or the cumulative flow.

Although there are many segmentation methods to form various forms of PDF, most of them have similar basic characteristics.

The main reason for the PDF error is the leakage of the gap between the movable measuring piece and the static measuring chamber that divides a single fluid volume.

One of the reasons for leakage is to overcome the frictional resistance of moving parts. The second is the effect of pressure drop formed by the hydraulic resistance of the instrument.

Converter Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Positive displacement flow meter types Accuracy

PDF has high measurement accuracy, the basic error is generally ±1%R, and the special one can reach ±0.5%R or higher. Usually used in expensive media or where precise metering is required.

PDF has no effect on the metering accuracy when the flow velocity field of the rotating flow and the pipe blocker is distorted, and there is no requirement for the straight pipe section in front. This is of great significance in field use.

PDF can be used for the measurement of high viscosity fluids. The range is wide, generally 10:1 to 5:1, and special can reach 30:1 or more.

PDF is a direct-reading instrument that does not require external energy, and can directly obtain the cumulative total, which is clear and easy to operate.

Positive displacement flow meter types

There are many types of PDF, which can be classified according to different principles. According to the structure of the measuring element, there are the following types:
1) Rotor type
2) Scraper type
3) Rotating piston type
4) Membrane type, etc.

Read more about: Types of positive displacement flow meter

Positive displacement flow meter advantages and disadvantages

Advantages

PDF measurement accuracy is high, the basic error is generally ±0.5%R, and the special one can reach ±0.2%R or higher. Usually used inexpensive media or occasions requiring precise measurement.

PDF has no effect on the measurement accuracy when the flow velocity field of the rotating flow and the pipe choke is distorted, and there is no requirement for the front straight pipe section. This is of great significance in on-site use.

PDF can be used for the measurement of high-viscosity fluids.

The range is wide, generally 10:1 to 5:1, and special can reach 30:1 or more.

PDF is a direct-reading instrument without external energy. The cumulative total can be directly obtained, which is clear and easy to operate.

In the indirect mass flow measurement combined with volumetric flowmeters, PDF is compared with volumetric flowmeters derived from velocity equations. The volume is a direct geometrical quantity. The influencing factors of the volumetric quantity are simpler.

In the measurement of high-pressure natural gas that is not suitable for density meter measurement, the compression coefficient of difficult-to-handle gas can be obtained indirectly with PDF.

Disadvantages

The PDF structure is complex, bulky, and heavy, especially the larger-diameter PDF is bulky. Therefore, it is generally only suitable for small and medium-sized.

Compared with several other types of general flow meters (such as differential pressure, float, electromagnetic). PDF’s measured medium types, medium working conditions (temperature, pressure), and caliber limitations are larger, and the scope of application is narrow.

Due to the thermal expansion and deformation of parts at high temperatures, and the brittleness of materials at low temperatures, PDF is generally not suitable for high and low temperature applications. At present, the usable temperature range is roughly -30~+160℃, and the maximum pressure is 10MPa.

Most PDF instruments are only suitable for clean single-phase fluids. When particles and dirt are contained, a filter must be installed upstream, which will increase the pressure loss and increase maintenance work. For measuring liquids containing gas, a gas separator must be installed.

PDF security is poor. If the detection moving parts are stuck, the fluid cannot pass through, and the cut-off piping system cannot be used. However, some structural designs (such as Instromet’s waist wheel flowmeter) have a built-in bypass in the housing. When the detection moving element is stuck, the fluid can pass through the bypass.

Read more about Mass Flow Rate vs Volumetric Flow Rate

Use and Maintenance

  1. The volumetric flowmeter should be installed and used in accordance with the standard flow range, nominal pressure and flow direction marks on the nameplate.
  2. The positive displacement flowmeter should work under the condition that the fluid temperature is -20~+120℃ and the ambient temperature is -20~+55℃ and the relative humidity of the environment is not more than 80%.
  3. When the positive displacement flowmeter leaves the factory, it is calibrated with water at room temperature. If the measured fluid is different from the water at room temperature,the constant should be corrected or re-calibrated with the actual measured fluid, but for fluids with a viscosity less than 5×10-6m2/s (5Mpa.s), there is no need to re-calibrate.
  4. Under normal circumstances, the service life of positive displacement flowmeters is generally from six months to one year, depending on the severity of the working conditions. And should be removed and washed regularly. If the shaft or bearing is found to be severely worn, it should be replaced and re-calibrated.

Extended reading: Cylinder Gear flow meter for micro flow measurement.

The Sanitary Positive Displacement Flow Meter is made of stainless steel and is quickly connected by Tri-clamp. Can be used to measure viscous liquids in the food industry. Such as sweeteners, edible oil, palm oil, honey, fat, tallow, fat, syrup, molasses, etc.

Gas Roots flowmeter is an instrument that accurately measures gas flow, based on the principle of volumetric measurement. For accurate metering of gas flow through closed pipes.

The flowmeter is composed of two parts: Roots flow sensor and display instrument. It can be used to measure non-corrosive gases such as natural gas, city gas, propane, nitrogen, and industrial inert gases. Mainly used in gas business settlement in catering, hotel and other industries. Gas metering for transmission and distribution network, gas pressure regulating station metering, industrial and civil boilers and other gas metering. Can also be used as a standard flow meter.

Rotary positive displacement gas flow meter is mainly composed of flow meter body, rotating element, electronic display device or mechanical display device.

There is a metering chamber within the housing of the flowmeter. There are one or two pairs of rotating elements that can rotate tangentially.

A pair of drive gears are mounted coaxially with the two rotating elements outside the flowmeter housing. They mesh with each other. Thereby, the mutual linkage of the two rotating elements is realized.

For each revolution, a fixed amount of gas is expelled.

The number of revolutions of the rotating element is recorded, based on the volume of the metering chamber space (cycle volume). The volume of gas flowing through the flowmeter can be obtained.

Positive displacement flow meter vs turbine

A turbine flowmeter has the characteristics of simple structure, lightweight, simple maintenance, and adaptability to high parameters (high temperature, high pressure, and low temperature). Turbine flowmeters are currently mainly used in the measurement of natural gas, coal gas, petroleum, organic liquids, inorganic liquids, cryogenic fluids, liquefied gas, and other media.

So is the turbine flowmeter a positive displacement flowmeter?

A turbine flowmeter is not a positive displacement flowmeter, but a velocity flowmeter. Turbine flow meters, positive displacement flow meters and Coriolis mass flow meters are three types of flow meters with excellent repeatability and accuracy.

Read more about Turbine Flow Meters

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Mechanical Flow Meters

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Sino-Inst, Manufacturer for Positive Displacement Flow Meters. For example crude oil flow meter, diesel flow meter, gasoline flow meter.

Sino-Inst’s Positive Displacement Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Ultrasonic Liquid Level Measurement

The ultrasonic liquid level sensor is a non-contact measuring device. That can send and receive high-frequency sound waves to measure the distance to the surface of liquid-based materials.

The ultrasonic liquid level measurement uses the non-contact principle. It is most suitable for level measurement of hot, corrosive, and boiling liquids. It is used to measure liquid levels. Ultrasonic equipment that converts it into electrical signals to send to other instruments.

Sino-Inst offers a variety of ultrasonic liquid level sensors and transmitters for continuous, non-contact tank level measurement. If you have any questions, please contact our sales engineers.

Featured Ultrasonic Level Sensors

Extended reading: Guide to Ultrasonic Level Transmitters

The liquid level sensor is a pressure sensor that measures liquid level. The static pressure input type liquid level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. It uses an isolated diffused silicon sensor or a ceramic capacitive pressure sensitive sensor to convert the static pressure into an electrical signal. Temperature compensation and linear correction are converted into standard electrical signals (usually 4~20mA/1~5VDC)

Read more about: Differences! Static pressure vs dynamic pressure vs total pressure

The working principle of the ultrasonic level gauge: The high-frequency pulse sound wave emitted by the ultrasonic transducer is reflected on the surface of the measured level, and the reflected echo is received by the transducer and converted into an electrical signal. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object. The relationship between sound wave transmission distance S and sound speed C and sound transmission time T can be expressed by the formula: S=C×T/2.

According to the characteristics of ultrasound, it is actually more suitable for occasions where the accuracy requirements are not high and the working environment is not harsh.

  1. Water treatment industry.

Water treatment industry, including sewage treatment, tap water, pure water manufacturing and other occasions.

The measured medium is basically sewage and clean water, which does not require high measurement accuracy. And the working environment is basically not corrosive, there is no electromagnetic interference, and most of them work in the open air. At most, large waves are encountered where the water enters, or there is a small amount of foam on the water surface.

More about Application 3: Level Measurement In Waste Water Treatment Plants.

  1. Water conservancy and hydrology Water conservancy and hydrology industry.

In the early years, it was mainly used to measure water level changes at the gate. In recent years, because the state has increased its investment in the water conservancy industry. Flash flood warnings and water level and rainfall monitoring must be carried out in small and medium river basins.

These occasions basically need 24VDC power supply and RS485 output.

Because they are all measured on the water surface, there is no requirement for the launch angle of the ultrasonic level gauge. There will be no volatility and foam influence.

  1. Farmland Irrigation With the scarcity of water resources, farmland irrigation has begun to implement water level and flow monitoring.

It is generally carried out on a relatively wide channel. Small channels generally do not need to be measured.

The common channel width is more than 1 meter.

4. Chemical companies mainly need anti-corrosion and explosion-proof ultrasonic level gauges.

Liquids in chemical companies are measured by ultrasonic waves, which are basically in storage tanks.

For example: sulfuric acid, hydrochloric acid, liquid caustic soda, toluene, xylene, olefin, ammonia, acetone, etc. These occasions can be solved with an ultrasonic level gauge. If it is in the reactor, it will be affected by stirring.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

Advantages of ultrasonic level sensor:

  1. Simple structure. Convenient reading. Convenient installation and maintenance.
  2. Safe and clean. Long life. High precision. Stable and reliable.
  3. Non-contact measurement. It is less affected by the viscosity and density of the liquid.

Disadvantages of ultrasonic level sensor:

  1. There should be no obstacles under the sound wave. Because the ultrasonic level sensor uses the principle of sound wave reflection to achieve liquid level measurement. If there are obstacles, it will affect the ultrasonic emission. It will cause signal loss and affect the measurement effect.
  2. The measurement of ultrasonic level sensor is prone to blind spots. This is because in the ultrasonic pulse transmission process. Because the mechanical inertia occupies the transmission time. Therefore, the small area near the ultrasonic transducer cannot receive the sound wave. The area that cannot be measured is called the blind zone. The size of the blind zone is related to the ultrasonic measurement distance. The smaller the measuring distance, the smaller the blind zone. The larger the measuring distance, the larger the blind zone.
  3. The measurement of ultrasonic level sensor is easily affected by temperature. In actual measurement, changes in temperature will cause changes in the speed of sound. This will lead to errors in the measurement.
  4. It is not suitable to measure pressure vessels. Because the pressure mainly affects the probe. And there is a certain relationship between pressure and temperature. Pressure changes will affect the temperature changes, which in turn affects the speed of sound. The accuracy of the measurement is affected.

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

Extended reading: What is the difference between ultrasonic and radar level transmitters?

Radar Level Transmitter is an application of microwave (radar) positioning technology in level measuring instruments. It transmits energy waves through a device that can emit energy waves (usually pulse signals). The energy waves are reflected when they encounter obstacles, and the reflected signals are received by a receiving device.

Extended Reading: Silo/Bin material level measurement system

According to the time difference of the energy wave movement process, the level change can be determined. The microwave signal is processed by the electronic device. Finally, the microwave signal is converted into an electrical signal related to the level.

Extended reading: Liquid mass flow controller

Liquid Level Measurement Using Ultrasonic Method

The basic principle of ultrasonic measurement of liquid level is: the ultrasonic pulse signal sent by the ultrasonic probe propagates in the gas, and is reflected after encountering the interface of air and liquid. After receiving the echo signal, calculate the propagation time of the ultrasonic wave. Convert the distance or liquid level height.

Read more: Guide: Non-contact Ultrasonic Level Sensing transmitters

Common Applications for Ultrasonic Liquid Level Sensors

Ultrasonic liquid level sensor integrates three functions of non-contact switch, controller and transmitter. Suitable for small storage tanks. In integrated systems or replace float switches, conductivity switches and static pressure sensors. It is also suitable for integrated applications in fluid control and chemical supply systems. for machinery, brakes and other equipment The application of small storage tanks is also a good choice.

Extended reading: The Secret of Ultrasonic Level Measurement

Ultrasonic Liquid Level Measurement

Extended Reading: How to Measure Volume of Liquid

The Ultrasonic Liquid Level Measurement Also Has the Following Characteristics:

  • The range of the ultrasonic liquid level sensor is 1.25 meters
  • Ultrasonic liquid level sensor DL10 output 4~20mA
  • Ultrasonic liquid level sensor DX10 outputs 0-5V voltage signal
  • Ultrasonic liquid level sensor probe material PVDF, resistant to acid and alkali corrosion
  • Narrow beam angle of 0 degrees, support static tube technologyWebCal software calibration, protection grade IP67

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

List of Radar Level Sensors

Non-contact radar level sensor Radar level sensors are used for continuous non-contact level measurement of liquids or solids. And convert…

Capacitive Fuel Level Sensor

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Laser Level Transmitter

What is a laser level transmitter? A laser level transmitter is also called a laser level meter. Industrial Accurate, non-contact,…

Extended reading: Non-Contact Level Measurement

Sino-Inst offers over 10 Ultrasonic Level Sensing sensors and transmitters for level measurement. About 50% of these are float liquid level meters, 40% is the level switches.

A wide variety of Ultrasonic Level Sensing sensors and transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Ultrasonic Level Sensing sensors and transmitters instrumentation, located in China.

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MEMS Pressure Sensors

MEMS pressure sensors are pressure sensors manufactured using MEMS technology. MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors.

MEMS pressure sensors are the earliest developed miniature sensors with a large market share. MEMS pressure sensors can be divided into piezoresistive and capacitive types. Both are micromechanical electronic sensors generated on silicon chips. MEMS pressure sensors can use high-precision, low-cost mass production with integrated circuit-like design techniques and manufacturing processes. This makes pressure control simple, easy to use, and intelligent. Compared with traditional mechanical quantity sensors, the size of MEMS pressure sensors is smaller, and the largest is no more than one centimeter. Compared with traditional “mechanical” manufacturing technology, its cost performance is greatly improved.

Sino-Inst offers a variety of MEMS pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Industrial Pressure Sensor for OEM applications
High Temperature Pressure Sensor
Combined Pressure and Temperature Sensor-Dual function
High Pressure Sensor
Gauge Pressure Transmitter/Transducer
Hydrostatic Pressure Sensor/Transmitter
Piezoresistive Differential Pressure Transmitter
Differential pressure(DP) level transmitter

Features of MEMS Pressure Sensors

  • Single crystal silicon sensor using German MEMS technology
  • Integrated sensor design using patented technology
  • Two-wire system. 4 ~ 20mA analog output. HART® digital communication or four-wire system. RS485 output (MODBUS protocol)

Read more about: What is a pressure sensor and how it works? 

Specifications of MEMS Pressure Sensors

RangeMinimum rangeDPRange and sensor limit (kPa)Minimum rangeGPRange and sensor limit (kPa)Minimum rangeAPRange and sensor limit (kPa)
Code(kPa)Upper range (URL)Lower limit of range (URL)(kPa)Upper range (URL)Lower limit of range (URL)(kPa)Upper range (URL)Lower limit of range (URL)
10.11-1//////
20.25-5//////
30.220-200.220-20///
40.550-500.550-500.5500
52200-2002200-10022000
65500-5005500-100///
7202000-500202000-1002020000
810010000-50010010000-100100100000
9///40040000-100///
Measuring range of MEMS pressure sensor
  1. Sensor type: German MEMS technology single crystal silicon sensor
  2. Range ratio: 100: 01: 00
  3. Accuracy grade: 0.075, 0.1, 0.2
  4. Stability: 36 months error is ± 0.2% of maximum range
  5. Temperature effect:
    1. “0.075 level: zero point or range error is ± 0.15% / 28 ℃ of maximum range
    2. 0.1 level: Zero point or range error is ± 0.2% / 28 ℃ of maximum range
    3. Level 0.2: Zero point or range error is ± 0.25% of maximum range / 28 ℃ “
  6. Output signal: “Two-wire system, 4 ~ 20mA DC, HAR T® protocol digital signal. Or four-wire system, RS485 output (MODBU S protocol)”
  7. Metrology certification: CMC
  8. Explosion-proof certification: “Explosion-proof type: Exd IIC T6 Gb
                 Intrinsically safe type: Exia IIC T6 Ga or Exib IIC T4 Gb “
  9. Protection grade: IP67

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What does MEMS mean?

MEMS is the abbreviation of Micro-Electro-Mechanical Systems. MEMS is the name of the United States. In Japan, it is called micromachine. In Europe, it is called microsystem. MEMS refers to mass production, which integrates micro-mechanisms, micro-sensors, micro-actuators, signal processing and control circuits, and interfaces. , Communication and power supply are equal to a micro device or system. MEMS is developed with the development of 1653 technology for semiconductor integrated circuit micromachining and internal ultra-precision mechanical processing technology. Currently MEMS processing technology is also widely used in microfluidic chips and synthetic biology. Chip integration of the technical process of the actual volume laboratory.

What is a MEMS pressure sensor?

MEMS pressure sensor is a pressure sensor manufactured by MEMS technology.
MEMS pressure sensors are the earliest developed miniature sensors with a large market share. The current application field has been greatly expanded, far beyond the traditional applications in industrial transmitters and other fields. Generally, MEMS pressure sensors are made by bulk silicon processing technology, and some are made by surface silicon processing technology. MEMS pressure sensors can be divided into piezoresistive and capacitive. Similar to other sensors, the MEMS pressure sensor converts the pressure into an electrical signal output during operation.

Extended Reading: Digital Pressure Sensor-RS485

Piezoresistive MEMS pressure sensor

The piezoresistive MEMS pressure sensor uses a high-precision semiconductor resistance strain gauge to form a Wheatstone bridge as a force-electric conversion measurement circuit. It has high measurement accuracy, low power consumption, and extremely low cost.

Capacitive MEMS pressure sensor

Capacitive pressure sensors use MEMS technology to produce a diaphragm grid on the silicon wafer. The upper and lower diaphragms become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure and changes the upper and lower diaphragms. The spacing of the grids also changes the capacitance between the plates, that is, △ pressure = △ capacitance

Read more about: Capacitive pressure transducer

How does a MEMS pressure sensor work?

The MEMS piezoresistive pressure sensor uses a circular stress cup silicon film inner wall fixed around the periphery. MEMS technology is used to directly engrave four high-precision semiconductor strain gauges on the surface with the highest stress. Make up the Wheatstone measuring bridge. As a force-electricity conversion measurement circuit. The physical quantity of pressure is directly converted into electricity. The measurement accuracy can reach 0.01% ~ 0.03% FS.

You may like: How does a pressure transmitter work?

The MEMS capacitive pressure sensor uses MEMS technology to produce a diaphragm grid on the silicon chip. The two upper and lower diaphragms become a group of capacitive pressure sensors. The upper MEMS capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The two upper and lower transverse barriers become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure. Changed the spacing between the upper and lower two horizontal barriers. It also changes the size of the capacitance between the boards.

Video on How MEMS Pressure Sensor Operation:

Video source: https://www.youtube.com/watch?v=juf4d3sgOJw

Applications of MEMS Pressure Sensors

  1. Applied in the automotive industry
    A new application of MEMS pressure sensors in automobiles is the transmission system pressure sensing. It is usually used in automatic devices. But it is also used in new dual clutch transmission systems. German manufacturers have introduced a MEMS solution that uses oil to protect the silicon film so that it can withstand pressures up to 70 bar. Bosch also brought huge changes to MEMS pressure sensors a few years ago. At that time, porous silicon was used to bring highly reliable MEMS devices. These devices have been used in current side airbag applications.
  2. Applied to the medical market
    The pressure sensor mainly serves as a disposable low-cost catheter for surgical operations. But they are also used in expensive equipment. Sensing pressure and differential flow in continuous positive airway pressure (CPAC) machines.
  3. Applied in the industrial field
    The main applications of MEMS pressure sensors include heating, ventilation and air conditioning (HVAC), water level measurement, and various industrial process and control applications. For example, in addition to accurate altitude and barometric pressure measurements, aircraft use sensors to monitor engines, flaps, and other components.

Extended reading: What is a pressure sensor?

Frequently
Asked
Questions

Depending on the type of pressure to be measured:
Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures.
According to the working principle of the pressure transmitter:
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

First of all, the parameters that must be seen when purchasing a pressure transmitter are:
Pressure range. Range. Measurement medium. Installation method-threaded flange clamps, etc. Installation dimensions. Temperature. Whether with display. Whether with HART protocol. Output type. Current output or voltage output. Explosion-proof level, protection level. Accessories. Mounting bracket.
The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of pressure transmitter, offer you with the best price.

At present, there are mainly two types of MEMS pressure sensors: silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both of these are micro-mechanical electronic sensors produced on silicon chips.

The first type: silicon piezoresistive pressure sensor

The silicon piezoresistive pressure sensor uses a Wheatstone bridge composed of high-precision semiconductor resistance strain gauges as the measurement circuit for electromechanical conversion. It has the advantages of high measurement accuracy, low power consumption, and low cost. The output of the piezoresistive sensor in the wheatstone bridge is zero. If there is no pressure change, there is almost no power consumption.

The MEMS silicon piezoresistive pressure sensor is the inner wall of a silicon membrane with a circular stress cup fixed around it. Using MEMS technology, four high-precision semiconductor strain gauges are directly engraved on the place with the largest surface stress to form a Wheatstone measurement bridge. As an electromechanical conversion measurement circuit, it directly converts the physical quantity of pressure into electrical energy. Its measurement accuracy can reach 0.01-0.03%FS.

The second type: capacitive pressure sensor

The capacitive pressure sensor uses MEMS technology to make a horizontal grid shape on a silicon wafer. The upper and lower horizontal grids form a set of capacitive pressure sensors. The upper horizontal grid moves downward under pressure to change the distance between the upper and lower horizontal grids and the capacitance between the plates, that is Pressure = Capacitance.

MEMS pressure sensors can adopt the design technology and manufacturing process similar to integrated circuits, so as to carry out high-precision, low-cost mass production, and have a wide range of applications in ventilators, automobiles, earphones, mobile phones and other fields.

More Pressure Measurement Solutions

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High Accuracy Pressure Transducers

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Sino-Inst offers over 20 MEMS Pressure Sensors. About 50% of these are 4-20ma Low-Pressure Transducers, 40% are Differential Pressure Gauge, and 20% are Diaphragm Seal Pressure transmitters, 20% are 4-20ma differential pressure transmitters.

A wide variety of MEMS Pressure Sensors options are available to you, such as free samples, paid samples. Sino-Inst is a globally recognized supplier and manufacturer of Pressure Transducers, located in China.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

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Magnetostrictive Level Sensor in Storage Tank Level Measurement

Tank Level Measurement is important for industry storage tank. For example, level measurement of fuel oil tanks and the interface measurement of chemical storage tanks. The liquid level sensor is a kind of level instrument. Hydrostatic, Ultrasonic, Magnetostrictive, Radar, Differential Pressure are commonly choices for tank level measurement. Here, we mainly analyze the magnetostrictive liquid level sensor in the tank applications.

Liquefied petroleum gas is one of the most widely used fuels in civil and industrial production. During the storage and transportation of liquefied petroleum gas, liquid level measurement is an important task of the project. It is required not only to have high accuracy for liquid level measurement. It must also be able to adapt well to the working conditions of closed pressure vessels. At the same time, in order to meet the needs of remote monitoring and management. It must also require the measurement data to have the function of long-distance transmission.

Featured Level Sensors for Tank Level Measurement

Rigid Probe Magnetostrictive Level Transmitter
Integral flange Magnetostrictive level sensor
Digital Display Magnetostrictive liquid level sensor

Comparison of the common detection methods for the Tank Level Measurement

Instrument nameAccuracyMeasuring principleLiquid level, interface, temperature measurementRegular maintenanceOn-site installationoverall costsService life
Magnetostrictive liquid level sensor0.5mmMagnetostrictionYes (integrated)Maintenance-freeSimpleLow20 years
Servo level sensor1mm
mechanical
Yes (split)
Regular maintenance
Complicated
High
short
Guided wave radar level senosr 1mm
RadarnoMaintenanceComplicatedHighLonger

Liquid level measurement methods for Tanks

There are 7 main types of level transmitters that Sino-Inst offers for Tank Level Measurement. Each type of transmitter works in a different way, and makes it useful for different types of processes.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

Analysis and comparison with other level sensors

(1) Optical fiber level gauge
Based on optical technology. Use optical fiber as the sensor unit. Take out the sensitive state as an optical signal. Then photoelectric conversion. So it is easy to match with highly developed electronic control devices.

Compared with other conventional sensors, optical fiber sensors have high sensitivity, fast response speed, and strong resistance to electromagnetic interference. Corrosion resistance, good electrical insulation, small size and easy to form a remote monitoring network with optical fiber transmission system. Especially in the harsh environment of flammable and explosive, it is widely used.

(2) Differential pressure level gauge.Differential pressure level gauges use the principle of liquid pressure. At the bottom of the liquid, check the pressure difference between the liquid pressure and the standard atmospheric pressure. It deforms the semiconductor diffusion silicon film through the pressure of the liquid bottom.

Cause the bridge to be unbalanced. The circuit outputs a voltage corresponding to the liquid level height. In order to obtain the liquid level signal. It has the characteristics of high precision (0.7%), small drift and strong anti-overload capability.

But when the density of the medium changes with the temperature, pressure and composition of the medium, the differential pressure level gauge will produce a false level.

Extended reading: Hydrostatic Level Measurement

(3) Servo level gauge.
The servo liquid level gauge controls the float to follow the liquid level or interface changes through the servo motor. The servo float level gauge is subjected to different buoyancy forces on the liquid surface, in the liquid and on the interface through the float.

The gravity sensor is used to measure the weight of the float. It can send out long-distance signals at the same time. Use microcomputer for remote control. Its dynamic tracking error can reach 0.1mm.

At the same time, it can also compensate for the additional weight error caused by the low liquid level. The measurement accuracy of the liquid level can reach 0.7mm. The sensitivity can reach 0.1mm.

In addition, it also has self-diagnosis and communication functions. The level gauge has high reliability. But the price is relatively high.

(4) Radar level gaugeThe use of radar waves to measure the liquid level is a technology that has been paid close attention at home and abroad in recent years. It uses a horn-shaped waveguide to emit low-power microwaves (tens of microwatts).

Extended reading: Radar Oil Tank Level Sensor

After encountering the tested interface, part of the microwave is reflected back. Received by the transmitter and receiver combination level gauge system. Indirectly measure the liquid level by measuring the time difference between transmission and reception.

The biggest feature of the radar level gauge is that it is suitable for the environment where the application effect of the ultrasonic level gauge is not ideal.

Its maximum range can reach 35m, and the measurement accuracy can reach millimeter level. But its disadvantage is that the price is too high. Can not withstand high temperature and high pressure.

Read more about: 7 Level Senors for Tank Level Measurement

We can learn more about Fluid Level Measurement Techniques: https://www.azosensors.com/article.aspx?ArticleID=1097

Advantages of stainless steel magnetostrictive level sensor for oil Tank Level Measurement:

  1. High precision: the magnetostrictive liquid level gauge uses waveguide pulse to work. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse. Therefore, its measurement accuracy is high. The resolution is better than 0.01% FS. This is an accuracy that is difficult to achieve with other sensors.
  2. Good safety: the magnetostrictive liquid level gauge has high explosion-proof performance. Safer to use. Especially suitable for the measurement of chemical raw materials and flammable liquids. It is not necessary to open the tank lid during measurement. There is no insecurity for manual measurement.
  3. Strong reliability: Because the magnetostrictive liquid level gauge uses the waveguide principle. There are no mechanically movable parts. So there is no friction and no wear. The entire converter is enclosed in a stainless steel tube and does not contact the measuring medium. The sensor works more reliably and has a longer life.
  4. Facilitate system automation: The secondary instrument of the magnetostrictive liquid level gauge adopts standard output signal. Help the computer to process the signal. It is easy to work on the Internet. Improve the automation of the entire measurement system.
  5. Simple installation and maintenance: the magnetostrictive liquid level gauge is usually installed through the existing nozzle on the tank top. It is especially suitable for the installation of underground storage tanks and already put into operation. And will not affect normal production during the installation process.

Extended reading: Types of Fuel-Diesel Level Sensors

What is tank level measurement

Tank level measurement is a general term for measuring the static storage of liquid products in large storage tanks. It can be used for inventory measurement, which is to determine the total amount of products in the storage tank.

It can also be used for transmission and transfer measurement, that is, as a basis for product purchase, sale and tax payment. There are two main methods: volume-based and mass-based measurement.

Tank level measurement devices

Extended reading: ultrasonic level sensor for diesel tank

Tank level measurement using pressure

Pressure level sensors can be used to establish levels in rivers, tanks, wells or other liquids. The pressure at the bottom of the liquid-filled container is directly related to the height of the liquid.

The transmitter measures this hydrostatic head and provides a final level. In order to obtain an accurate reading, the measuring device must be located at the lower point where you want to measure; it is usually installed or placed at the bottom of the container.

When measuring the liquid level, the specific gravity must be considered. Consider the following equation:

     H = P / SG or P = SG? H

H-the height of the measured liquid. It is usually measured in inches, centimeters, meters, feet, etc.
P-Hydrostatic head at the bottom of the tank. Usually in inches of water column, feet of water column, horizontal bar, psi, Pascal’s, etc.
SG-the proportion of the medium. The dimensionless number is calculated from: measured medium density ÷ water density at 4 ° C. For example, the density of kerosene is equal to 0.82 g / cm 3. Therefore, the kerosene of SG is 0.82g / cm 3 · 1.00g / cm 3 = 0.82.

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Radar tank level measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy.

These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Radar Level Sensor Features

  • Non-contact, continuous level measurement over larger ranges
  • Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
  • Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
  • Simple mounting and push-button calibration

More about Radar level measurement

FAQ

How do you measure the depth of water in a tank?

The water level sensor of your water tank is an essential component. If not repaired or replaced, a sensor can become damaged over time and fail entirely. Too much water can cause a malfunction and too little water means inadequate water pressure. Either way, repairing or replacing holding tanks is an expensive task you shouldn’t have to undertake because of sub-par sensors.
With Sino-Inst’s water tank level sensors, there’s nothing to break down or rust and our models have a 99% success rate!
In the high unlikely event that you experience any issues with your product, call us and we’ll replace or repair it immediately at no charge.

How do I test my water level?

Water pressure transducers also called a water pressure sensor,
are pressure transmitters that can measure water pipe pressure.
For the water level/water depth measurement,
in the tank, or in the well, we can use electrical transmitters,
stainless steel body, IP65-IP6, 4-20ma output.

Sino-Instrument offers over 10 level transmitters for tank level measurement. About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

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Application Analysis of Intelligent Pressure Transmitter

Intelligent Pressure Transmitter is also called smart pressure transmitter.

Current intelligent pressure transmitters are generally hybrid intelligent pressure transmitters that have both digital and analog signals. Communication with DCS is mainly based on passing 4-20mA analog signals. Then superimpose digital signals on them for remote Set the zero point, range, and calibration, configuration, and diagnostics of the transmitter. It is only designed to be compatible with the existing DCS. Smart pressure transmitter is a transition product of true all-digital smart pressure transmitter (such as field bus type intelligent pressure transmitter).

As far as the composition structure of intelligent pressure transmitters widely used in the market is concerned, it mainly includes devices such as microprocessors, sensors, digital-to-analog converters, and memories. Different devices play different automatic control functions. The sensors are mainly aimed at The measured signal is detected. There are some differences in the materials designed in the specific application. As the core part of the entire device, the microprocessor is mainly used for comprehensive analysis and calculation of the relevant data collected by the device. Unit conversion, fault diagnosis, range adjustment, function calculation, etc. are performed for the detection signal. The function of the memory is to implement the configuration for the relevant data and programs in the microprocessor. At present, most of the memory used by people have the function of rewriting and adjusting. Related converters are mainly responsible for the interchange of digital signals related to analog signal machines. Smart pressure transmitters can communicate with DCS by outputting a series of digital signals. A reserve power supply is also set in the transmitter, which can prevent the memory data from being lost in the event of a power failure. According to the different types of sensors used in smart pressure transmitters, the transmitters can also be classified into capacitive, diffused silicon strain, and diffused silicon resonant types.

Featured Smart Pressure Transmitters

Diffused silicon Gauge Pressure Transmitter
A gauge pressure (GP) transmitter compares a process pressure against local ambient air pressure. Gauge pressure transmitters have ports to sample the ambient air pressure in real-time.
High-Temperature Pressure Transmitter
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 700 °C and is not pyroelectric.
Explosion-proof Pressure Transmitter
Explosion-proof Pressure transmitter, or explosion-proof pressure transducer, with the explosion-proof enclosure.
For applications in hazardous areas.
Diaphragm Seal Pressure Transmitter
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used for pressure measurement.
Hygienic / Sanitary Pressure Transmitter
Also called Hygienic pressure Transmitters, or tri clamp pressure transmitter. Sanitary pressure Transmitters is used to food &beverage or pharmaceutical application.
Capacitive Gauge Pressure Transmitter
Gauge pressure (GP) transmitters compare process pressure with local ambient air pressure. Gauge pressure transmitters have ports for real-time sampling of ambient air pressure.
Absolute Pressure Transmitter
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.
Hydrostatic pressure transmitter
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .

Function of Smart Pressure Transmitters

  • Type: Pressure- Differential(DPIT), Gauge/ Absolute(PIT), Level(LIT), High Static Pressure, Flow Pressure(FIT)
  • Certificate: SIL2 (TUV, FMEDA), Ex d, Ex ia, FM, ATEX, TR CU(EAC), INMETRO, CE, Rohs, BV, LR, KR, DNV, ABS, KCs, IP66/67, NEMA 4X
  • Feature: 4 to 20mA, HART, Loop Powered
  • Accuracy: ± 0.075% (option ± 0.04%) of CS* 3 lines LCD display, Self Diagnostic Function, External Buttons, DAC, Zero Trim, Eng mode
  • Application: Pressure, Flow, Level measurement for Oil & Gas, Liquid, Water, Maine & offshore, Vessel, Power, Chemical Plants and Refinery

More about: Absolute Pressure Vs Gauge Pressure.

Hydrostatic pressure for level measurement:

SI-151 Hydrostatic Level Sensor
SI-PCM260 Deep Well Water Level Sensor
SMT3151TR Hydrostatic level transmitter-Rod Type

Main Features of Smart Pressure Transmitters

Compared with conventional analog transmitters, smart pressure transmitters have many characteristics. Take Rostman smart pressure transmitters as an example. The characteristics of this pressure transmitter are mainly concentrated on the following points:

1. Wide range and large range ratio

Intelligent pressure transmitters generally have a wide measuring range. The measuring range ratio is large, from 30: 1 to 100: 1, and some even reach 400: 1. The measuring range ratio of the transmitter refers to the maximum measurement range (URV) and the minimum measurement Range (LRV) ratio. Because the intelligent pressure transmitter has a wide measuring range, compared with conventional analog pressure transmitters, the biggest advantage is that it can reduce the inventory. At the same time, according to the process requirements, the measuring range can be changed at any time without following the meter change, without having to change the meter. Don’t worry about exceeding the range.

2.Simple and convenient maintenance

The handheld communicator can be used to communicate with the intelligent pressure transmitter at the terminal of the field transmitter or at the terminal in the control room of the main control room. In this way, the instrument maintenance personnel can perform range modification, parameter setting, and instrument maintenance on the transmitter in a relatively safe and relatively good control room.

3.With high and low voltage side conversion function

Intelligent pressure transmitters generally have high- and low-pressure side conversion functions of the sensor, and the internal parameters can be adjusted with a handheld communicator. I encountered such a problem in production. Because the meter has been running for many years, the pressure guiding tube connected to the transmitter needs to be replaced due to leakage. When the meter is put into operation after replacement, it is found that the positive and negative phase pressure guiding tubes are reversed (because the pressure guiding tube is long , And there is a heat tracing tube together, the positive and negative phases are easily reversed). The intelligent pressure transmitter has high and low pressure side conversion functions, as long as the parameter items in the table are changed from NORMOAL (high pressure on the right side, low pressure on the left side) to REVERSE (low pressure on the right side, high pressure on the left side). After reconfiguring the table, Everything works fine, saving time and effort.

4. With fixed output function

This function is more convenient to use in the following situations: When the transmitter fails, in order to ensure the safety of production equipment and personnel, or to ensure product quality, the transmitter output needs to be a fixed value. After the annual overhaul, due to the meter All links in the control circuit have been overhauled. The entire circuit needs to be co-calibrated before driving. At this time, the fixed output function of the intelligent transmitter can be used by the hand programmer. Generally, any value between 3.8-21.6mA can be set, and the whole circuit where it is located is cascaded.

In addition, the intelligent pressure transmitter has the characteristics of high accuracy, good stability and high reliability.

Extended Reading: Selection of pressure transmitter

Application Analysis of Intelligent Pressure Transmitter

Used as a reminder of impulse pipeline problems

In general, the intelligent pressure transmitter is connected to the process through a small-diameter pipe, and this management is the impulse pipeline. In some applications, such impulse lines may be blocked by materials or frozen due to cold weather. These blockages may cause difficulties in transmitting pressure signals. In this case, the use of conventional pressure transmitters cannot be used to understand this clogging problem. The main reason is that in the case of a blockage problem, there is a certain difference between the signal indicated by the transmitter and the signal provided before the blockage occurred. It must be ensured that the output of the transmitter does not change with the actual flow rate change before it can be found The problem. It has been found in practice that if one or two impulse lines are blocked during some flow measurement processes, the standard deviation at a specific flow will change greatly. The intelligent pressure transmitter can effectively detect such changes. In this way, the blocking position of the impulse pipeline can be controlled in time, which facilitates fault finding and avoids increasing problems.

For flame instability detection in refining furnaces

In many chemical fields, refining furnaces are important equipment. Incineration of different chemical production waste gases is required. Because many BTUs coexist, the flame stability is not very good, which is also an important sign that the refining furnace is out. The application of intelligent pressure transmitter can measure the noise of the fire control pressure in the room. The transmitter can be used to detect the flame stability. The general measurement accuracy is relatively high, and it can detect the abnormal signal in the refining furnace. . Convenient staff to correct equipment problems in time to avoid flameout.At present, smart pressure transmitters are also used in related fields to a certain extent, which belongs to the category of precision instruments. In many fields of application, smart pressure transmitters can accurately detect related signals and data information, find abnormalities in time, and facilitate Find and repair the corresponding faults. It is helpful to reduce system failures and improve system operation efficiency.

Q&A

What is smart pressure transmitter?

Digital smart pressure transmitter is pressure sensor with a 12-bit or higher microprocessor. Smart pressure transmitters are high performance microprocessor-based transmitters with flexibility. Pressure calibration and output, automatic compensation.
Smart pressure transmitter also called intelligent pressure transmitter.
The intelligent pressure transmitter consists of two parts: a smart sensor and a smart electronic board.
The smart sensor part includes: a capacitive sensor. A measuring diaphragm detection circuit. A temperature sensor, and a temperature compensation circuit.
The smart electronic board includes: a microcomputer controller. And the peripheral circuit, complete the pressure signal to 4 ~ 20mA dc conversion.
Smart Pressure Transmitter is used to measure the pressure of liquid, gas or steam. And then convert the pressure signal into 4 ~ 20mA DC signal output. The intelligent pressure transmitter produced by Sino-Inst can communicate with the HART communicator. It is widely used in weakly corrosive liquids in industrial pipelines, Gas and steam measurement and control systems.
Extended reading: How to calibrate HART pressure transmitters

What is the principle of pressure transmitter?

Like other transmitters, a pressure transmitter consists of electronics connected to a sensor. We can find transmitters with many types of pressure sensors on the market – capacitive, piezoelectric, resonant silicon, and more.
So pressure applied to capacitive cells will produce a change in the capacitance of the sensor. This change will affect the oscillator frequency, and the pressure transmitter will detect this change. Then the transmitter translates this data into a standard output signal that we can read.
Using a local setup or a handheld, you can adjust the transmitter, changing information like the unit, measuring range, and output.
More: How does a pressure transmitter work

How do you calibrate a smart transmitter?

To perform the test:
1. Isolate the transmitter from the process being measure and its loop wiring. If measuring the mA signal across the transmitter test diode leave the wires intact, but note this method does not give the best mA measurement accuracy.
2. Connect the mA measurement jacks of the 754 to the transmitter.
3. Connect the pressure module cable to the 754 and connect the transmitter test hose from the hand pump to the transmitter.
4. Press the HART button on the calibrator to see the configuration of the transmitter.
5. Press HART again and the calibrator will offer the correct measure/source combination for the test. If documenting the calibration press As-Found, input the test tolerance and follow the prompts. If the measured mA signal at the test points is found within tolerance the test is complete. If not, adjustment is required.
6. Select, adjust, and trim the pressure zero, mA output signal and input sensor.
7. After adjustment select As-Left, document the condition of the transmitter and after adjustment and if the test passes, it is complete.
More: Pressure Transmitter Calibration

How do you calibrate a pressure transmitter with HART Communicator PDF?

The basic procedure for calibration
1. Isolate the Pressure Transmitter from the Process.
2. Slowly open the vent plug and the vent valve to release the pressure.
3. Connect the multimeter with the transmitter and ensure that output is 4ma when 0 pressures are applied.
4. Connect the handheld test pump (pressure source) to the transmitter.
5. Ensure there is no leak.
6. Apply pressure range at 0%, 25%, 50%, 75%, 100% and check there is any error.
7. If there is any error calibration should be done.
Extended reading: Smart Differential Pressure Transmitter

Amazing Solutions for Continuous Liquid Level Measurement

Looking for a specific type or a custom continuous liquid level sensor? Sino-Inst offers High quality Liquid level sensors for continuous level measurement.

Level sensors are used in process control in many industries and they fall into two categories. Continuous level measurement sensors and Point level measurement sensors.

The point level measurement sensor is used to indicate a single discrete level, that is, to indicate a preset level. The function of this type of sensor is the upper limit alarm, which indicates the overfill condition, or the lower limit alarm condition.

Continuous level sensors are more complex, allowing level monitoring of the entire system. They measure the level of the liquid level in a range, not the level of a point. Continuous level sensors produce an analog output that is directly related to the liquid level in the container. To build a level measurement system, this output signal is transmitted to the process control loop and visual indicators.

Sino-Inst offers a variety of Level senors for Continuous level measurement. If you have any questions, please contact our sales engineers.

Featured Continuous Level Sensors


SI-LT Magnetostrictive level transmitter with Local Digital Display
SI-100 Magnetostrictive Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch

SI-U01 Float Level Sensor
ULT-200 Ultrasonic Level Detector
ULT-100A Ultrasonic Level Transducer
SMT3151TR Submersible Level Transmitter–2Mpa,200m
SI-80 Radar Level Sensors
SIRD90 Radar Level Transmitters, Non-Contact

SIRD70 Guided Wave Radar (GWR) Level Transmitters
RF Capacitance Level Transmitter

What is a Continuous Liquid Level Sensor?

Continuous level sensor definition

Continuous level sensors are transmitters that measure liquids within a specified range. Level sensors determine the exact amount of liquid that provides a continuous analog signal. The level signal can be displayed directly on site or integrated into a process control or management system. These products can be installed vertically and horizontally. They are ideal for monitoring liquids in confined or restricted areas.

Wikipedia: Level sensor

Difference between a point level sensor and a continuous level sensor?

Point level sensor

A sensor designed for point detection will detect liquid at a certain point in the tank or chamber. Generally, this applies to processes that require high-level or low-level management.

In most cases, they act as switches when the tank level rises or falls to a certain level. This could be an alarm or a bonding device. Essentially, the sensor detects when the liquid has reached the desired point, and it acts as a switch to activate the necessary response.

Continuous level sensor

The continuous level sensor is designed to detect the level through every point in the tank or chamber. This means that it provides feedback regardless of the level and the entire container range. This is great for processes where level is always important, and for applications that require increased accuracy.

Read more about: Ultrasonic Level Sensors for Liquids Applications

Extended Reading: How to Measure Volume of Liquid

A point level sensor is a device that can detect the presence or absence of almost any liquid medium. Typically, these sensors are used in processes that need to detect high or low levels.

Generally, common applications requiring point sensors fall into two categories:
Leak detection – to prevent costly damage or service interruption to equipment or level measurement – to prevent spillage or dry conditions.

The technology works like a switch. When the level of a tank or container reaches or falls below a certain threshold. It drives an action.

A wide range of point level sensors are available for many applications and materials.

The float level sensor is a common point level sensor.
The float level switch consists of a fixed rod and a float.
The float has a built-in permanent magnet, which moves freely along the fixed rod with the rise and fall of the liquid level. The magnetic field of the permanent magnet acts on the reed switch, and the closer it is to the reed switch, the stronger the force. When the threshold is reached, the reed switch is closed.
The float level sensor has a robust structure and a measurement deviation of less than 1%.

For point level detection applications requiring no moving parts. Optical liquid level sensors are a good option.
Optical liquid level sensors are suitable for high, medium and low liquid level detection. and fits almost any installation. It has no moving parts, emits infrared light through LEDs, and calculates liquid level changes based on the amount of reflected light.
Optical level sensors are available in custom high temperature models and in different sizes to meet the needs of different applications.

Capacitive level sensors are suitable for reflective, viscous or viscous fluids. According to their principle, capacitive sensors enable non-invasive measurements. Internal level changes can be measured without drilling holes in the vessel under test.

Ultrasonic liquid level sensors work by emitting and measuring reflected high-frequency sound waves, which can withstand high pressure, high temperature and vibration. It is suitable for measuring liquids without foam and air bubbles. Ideal for applications in agriculture, mining, construction, printing, and specialty vehicles.

Extended reading: How does a Radar Corrosive Liquid Chemical Level Sensor work?

Continuous level sensor 4-20 ma

Sino-Inst provides signal output for all continuous level sensors. Analog signal output, 4-20mA output, 0-5V, RS485, HART optional.

Advantages of current signal (4 ~ 20mA signal)

  1. The current signal is suitable for long-distance transmission. Because the current signal is not affected by the resistance of the wire. And the voltage signal will be divided when the wire itself has resistance, resulting in inaccurate measurement. Generally, the maximum transmission distance of 4 ~ 20mA is controlled within 100m, and it is recommended to use digital signals (485 communication)
  2. The current signal generally uses a two-wire system, and the voltage signal generally uses a three-wire system. In contrast, the two-wire system saves materials and reduces costs than the three-wire system.
  3. Compared with the on-site working conditions, the anti-interference ability of the current signal is stronger than the voltage signal. In the case of interference, it is recommended that the user select a 4 ~ 20mA signal.
  4. The current signal can appropriately exceed the range of the range and output inaccurate signals. For example, a pressure transmitter with a range of 1MPa and an output of 4-20mA can output 24mA when it exceeds the range. The voltage signal is slightly different depending on the power supply. For example, a pressure transmitter with a range of 1 MPa and an output of 0 to 10 V cannot output signals above 9 V when the power supply is 9 V.
  5. When the wire materials are not the same (such as copper, nickel), a magnetic field will generally be generated. And the voltage signal will have an error, and the current signal will not be required in the case of higher accuracy requirements.

Continuous Level Sensor can also be used with paperless recorder.

Measuring techniques for continuous level measurement

1. Ultrasonic Level Sensors

Ultrasonic Level Transmitters provide non-contact and maintenance-free level measurement, (Like the Radar ) for fluids, pastes, sludges and powdery to coarse bulk materials.

Ultrasonic level measurement, easy installation, wireless, portable and can be explosion-proof.Sonic is the sound we can hear. Ultrasonic is the sound above the human hearing range.

A human can hear maximum up to a frequency of 20 KHz. Ultrasonic frequencies are above 20 KHz. Ultrasonic waves are used to measure the level of liquids and solid objects in industries.

Ultrasonic level measurement is the contactless principle and most suitable for level measurements of hot, corrosive and boiling liquids.

The normal frequency range used for ultrasonic level measurements is within a range of 40-200 KHz.

Extended reading: Ultrasonic liquid level sensors

2. Hydrostatic (Pressure) Level Transmitters

Hydrostatic level transmitters, also called submersible level transmitter, or pressure level transmitters. For Hydrostatic level measurement, Continuous level measurement in liquid applications with pressure sensors. These transmitters help in determining fluid level of a container. By measuring the pressure of resting body of the fluid within it.

3. Continuous Level Radar Sensors

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors

Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy. These transmitters work on the principle of radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid.

The transmitter sends a radar signal into the liquid and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

4. Guided Wave Radar Level Sensors

Guided Wave Radar (GWR) Level Transmitters, also called wave guided radar level transmitter. Using guided wave radar technology, GWR level transmittershave no moving parts. They can measure both level and the interface between two media.

Continuous level measurement in liquids and solids with guided wave radar sensors. These transmitters work by sending a microwave pulse through a sensor cable or rod. The signal hits the surface of the liquid, and travels back to the sensor, and then to the transmitter housing.

Based on the time taken by the signal to travel down the sensor and back up again. The electronics integrated in the transmitter housing determine the filling level.

Extended Reading: Silo/Bin material level measurement system

5. Capacitance level detectors

Capacitance level detectors, also known as Capacitance level transmitter. RF Capacitance Level Transmitter offers continuous and point level detection. In liquids and solids with capacitance probes.

These transmitters use liquid stored in a tank or container as a dielectric medium between two or more electrodes. The energy capacity of the capacitor circuit increases when there is more liquid, and decreases if there is less liquid. Measuring the variations in the capacitance value, capacitance level transmitters calculate level of the tank.

Read more about: Capacitive Level Measurement Principle.

6. Magnetostrictive level transmitter

Magnetostrictive level transmitter, in-tank liquid level transmitter, is a continuous magnetic level gauge. The magnetostrictive level sensor, measure the level of fluid in the vessel.

By detecting the level of the magnets contained within the float and then transmits the measurement back to the control system.

7. Magnetic Float level sensors

Magnetic Float level sensors are continuous level sensors featuring a magnetic float that rises and falls as liquid levels change.

The movement of the float creates a magnetic field that actuates a hermetically sealed reed switch located in the stem of the level sensor, triggering the switch to open or close.

Comparative analysis – 7 Tank Level Measurement Sensors

Applications

Continuous level sensors are versatile in monitoring liquid level needs. They can monitor water, diesel, lube oils and fuels, as well as various chemical and petrochemical liquids. And compatible with corrosive and non-corrosive substances.

Continuous level sensors are and used by industries including:

  • Food and Beverage
  • HVAC
  • Medical
  • Printing
  • Off-Highway Vehicles
  • Semiconductor
  • Oil and Gas
  • Agriculture
  • Wastewater Treatment
  • Concrete/Aggregate
  • Plastic/Vinyl
  • Marine
  • Chemical

Extended reading: Sludge Blanket Level Detector Appliactions

The Silo/Bin level measurement and control system solves the problem of frequent dumping accidents in the powder silo of the mixing station during the feeding process. It avoids the problems of dust flying, waste of cement, and environmental pollution. It reduces the equipment damage caused by the collapse of the dust removal hood of the mixing station Other issues and prevents the safety issues of the workers present.

Extended Reading: Silo/Bin material level measurement system

Generally, we can use radar level sensors, ultrasonic, or guided wave radar to measure.

Tank level senor is a level sensor used to measure the tank level. The liquid level is the level of the liquid in a sealed container (such as a water tank) or an open container (water tank). The instrument that measures the liquid level is called a liquid level sensor, a liquid level gauge or a liquid level transmitter. The liquid level sensor is a kind of level instrument. Hydrostatic, Ultrasonic, Magnetostrictive, Radar, Differential Pressure are commonly choices for tank level measurement. Liquid level sensors have been around for decades for leak detection or level measurement. Common measured medium are: Water, Fuel, Diesel, Gasoline, diesel, liquefied gas, liquid ammonia, etc.

Read more about: Level Senors for Tank Level Measurement

To measure the powder level, most of the radar level gauges and ultrasonics are used. Or heavy hammer level gauge.

High-frequency radar level gauge application: powdery solids, or environments with a lot of dust
① coal bunker, cement bunker, clinker bunker,
② Flour, corn flour, rice flour, sorghum flour, etc.
③Iron powder, aluminum powder, etc.

Ultrasonic level meter (ultrasonic level sensor) is used to measure the level of solid materials such as coal, ore, corn, wheat, glass, straw, garbage, wooden boards, automobiles, plastic particles, etc. It is used in metallurgy, mining, grain processing, storage, security and other industries.

Extended reading: Non Contact Liquid Level Sensor Working Principle

A laser level transmitter is also called a laser level meter. Industrial Accurate, non-contact, and uninterrupted real-time monitoring of material height. Designed for material level and liquid level. A laser level transmitter is a continuous or high-speed pulsed laser beam emitted by a semiconductor laser.

The laser beam meets the surface of the object to be measured and reflects. The light return is received by the laser receiver. And accurately record the time difference between laser emission and reception. In order to determine the distance from the laser radar to the measured object. Laser level transmitter is similar to radar/ultrasonic level sensor.

Read more about: Laser Level Transmitter

There are many types of liquid level sensors that can measure water. From our personal experience, hydrostatic submersible level sensors are the easiest to use and relatively low cost.

Extended reading: Hydrostatic Level Measurement

But,

Sometimes, due to the limitation of measurement conditions, it is necessary to select the external water tank level indicator.
Our Sino-inst external water tank level indicator is based on ultrasonic principle.
When measuring with External Tank Level Indicator, install the ultrasonic probe just below the outer wall (bottom) of the container under test. No need to cut holes, easy to install. Does not affect on-site production. It can realize accurate measurement of various toxic substances and various pure liquids in high temperature and high pressure airtight containers.

Read more about: External Tank Level Indicator

How to select a continuous level sensor?

Selection of level measurement sensor.

Issues to consider before selecting a level measurement sensor include:

  1. Measure liquid or solid?
  2. What is the temperature and pressure range of the application environment?
  3. Need point level measurement or continuous measurement?
  4. What is the level measurement range required?
  5. Is the measured material conductive?
  6. Will the measured material cover or accumulate on the surface?
  7. Will there be turbulence, foam or steam on the liquid surface?
  8. Do you need contact or non-contact level measurement?
  9. What kind of output is required, analog, relay, digital display or other?

Frequently
Asked
Questions

In continuous level measurement, the level of a medium in a tank or silo is detected with the help of different measuring methods and converted into an electronic signal. 

Continuous level sensors are more complex, allowing level monitoring of the entire system. They measure the level of the liquid level in a range, not the level of a point, and therefore produce an analog output that is directly related to the liquid level in the container. To build a level measurement system, this output signal is transmitted to the process control loop and visual indicators.

There are 7 main types of level transmitters that Sino-Instrument offers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

The point level measurement sensor is used to indicate a single discrete level, that is, to indicate a preset level. Normally, the function of this type of sensor is the upper limit alarm, which indicates the overfill condition, or the lower limit alarm condition.

What are the common types of oil level sensors?

  • Magnetic float sensor: Developed according to the principle of buoyancy and magnetic coupling, with good visibility of characteristics and direct reading of values;
  • Pressure sensor: Use liquid pressure to measure liquid depth, suitable for measuring water depth in river channels;
  • Capacitive sensor: Utilize the principle that the capacitance formed between the probe and the container changes linearly with the liquid (material) level. There is no moving or elastic component. Impact resistance, easy installation, high accuracy, high reliability;
  • Magnetostrictive sensor: The principle of the sensor is to generate a longitudinal magnetic field through a permanent magnet and another magnetic field through an electric current. When the two magnetic fields intersect the waveguide, the waveguide generates a “magnetostrictive” phenomenon, and a strain pulse is generated instantly. Features It is fast and accurate. It is mostly used for liquid measurement in tank trucks;
  • Float sensor (reed switch): It is more common. Nowadays, the automatic oil level sensors of automobiles belong to this category. The working principle is to use the buoyancy of liquid on magnetic floating ball, and the dry spring of floating ball level gauge is magnetically attracted to change the liquid level position into an electrical signal. The reed switch is connected in sections, and the length of each section is the test accuracy of the level gauge.

The working principle of the oil level sensor device is through the continuous acquisition of the relative percentage signal of the oil level sensor. With the calibration algorithm, it is converted into the corresponding volume information. The fuel quantity of the fuel tank is monitored. Combined with the GPS system, the vehicle is known Driving status.

Point-level switches are used as high-level and spill-prevention alarms, low-level and pump-protection alarms, and to turn pumps on and off. Continuous level (proportional) measurement, on the other hand, indicates the level in a vessel over the full span of measurement.

Point level measurement is different from Continuous Level Measurement. Used to detect material levels in tanks or silos.

There are high levels (with material) and low levels (without material).

High level measurement allows containers to be filled to full capacity while preventing overflow situations.

Low level measurement alerts facilities to the need for replenishment, preventing process and/or plant downtime.

Technical Support

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Sino-Inst offers over 40 Continuous Level Measurement Sensors. About 50% of these are liquid level meters, 40% is the tank level sensor.
A wide variety of Continuous Level Measurement Sensors options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Continuous Level Measurement Sensors instrumentation, located in China.

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The Secret of Ultrasonic Level Measurement

Ultrasonic level measurement is a contactless principle and is most suitable for level measurements of hot, corrosive, and boiling liquids.

Ultrasonic level measurement provides a Continuous level measurement in liquids and solids with ultrasonic level sensors。 Non-contact, and maintenance-free level measurement of fluids, pastes, sludges, and powdery to coarse bulk materials. The measurement is unaffected by dielectric constant, density, or humidity. And also unaffected by build-up due to the self-cleaning effect of the sensors.

If you need to measure liquid levels, an ultrasonic level sensor is a good choice.

In the article “Level Senors for Tank Level Measurement“, we introduced a variety of level sensors that can be used to measure the tank level. Here, we will introduce the ultrasonic level sensor in detail.

Featured Sensors for Ultrasonic Level Measurement:

Features of Ultrasonic liquid level sensors

Ultrasonic liquid level sensors are non-contact level measurement devices. In the measurement, the ultrasonic pulse is sent by the sensor (transducer). The sound wave is reflected by the liquid surface and received by the same sensor or ultrasonic receiver. It is converted into an electrical signal by a piezoelectric crystal or a magnetostrictive device. It is transmitted and received by the sound wave. The time between the sensor and the surface of the liquid is measured. Due to non-contact measurement, the measured medium is almost unlimited. It can be widely used for measuring the height of various liquid and solid materials. Like: water level, fuel level, oil level, petrol tank level, and so on.

  • Accurate and reliable sensing method
  • Ultrasonic level sensor technology is ideal for difficult fluids where contact with the media is not desirable 
  • An ultrasonic liquid level transmitter is ideally sized and priced for most applications
  • Easy to install– simple to use
  • There are no moving parts
  • Temperature-compensated signal for improved accuracy
  • Self-cleaning sensor face
  • Unaffected by the target material’s color, shape or physical composition
  • Bench- or field-calibrated through communications with a PC or a push button on the sensor
  • Non-contact measurement, high performance, low cost, maintenance-free, high precision, long life;
  • Intelligent signal processing technology, the instrument adapts to various working conditions;
  • Two-wire system, three-wire system, isolated four-wire system
  • 24VDC, 220VAC power supply optional
  • Over-voltage, over-current, lightning protection
  • Photoelectric isolation 4-20mA current output

Extended Reading: How to Measure Volume of Liquid

Advantages of Ultrasonic Level Transmitter

  1. No media contact for vertically mounted type, so flexibility for use on different corrosive media, thick fluids, slurries, wastewater
  2. Ultrasonic level transmitter has no moving parts. And it can measure level without making physical contact with the object.
  3. High temperature fluid compatibility for vertically mounted types, since no sensitive components make contact with the fluid
  4. High accuracy due to high frequency pulse wave and precise transit time time measurement
  5. The accuracy of the reading remains unaffected even after changes in the chemical composition or the dielectric constant of the materials in the process fluids.
  6. Operates with conductive or non-conductive fluids
  7. Sealed pressurised vessel will not affect performance
  8. Shorter blocking distance than radar
  9. Useful for measuring levels in tanks with corrosive, boiling and hazardous chemicals.

Disadvantages of Ultrasonic Level Transmitter

  1. Foaming, splashing, vapour and humidity can affect measurement performance
  2. High cost compared to other technologies
  3. Minimal blocking distance limits operation when in proximity to liquid level
  4. Temperature compensation required to compensate for speed of sound variation with air temperature
  5. Sound waves cannot be transmitted through a vacuum
  6. Shorter range than radar.
  7. It is not so convenient if the tank depth is high or the echo is absorbed or dispersed.
  8. The object should not be sound absorbing type.
  9. It is also unsuitable for tanks with too much smoke or high density moisture.

More about The Difference Between Ultrasonic Depth Sensor And Ultrasonic Level Sensor.

Extended reading: Guide to Ultrasonic Level Transmitters

What Is the Principle of Ultrasonic Level Measurement ?

Ultrasonic waves detect an object in the same way as Radar does it. Ultrasonic uses sound waves, and Radar uses radio waves. When the ultrasonic pulse signal is targeted towards an object, it is reflected by the object, and the echo returns to the sender.

The time traveled by the ultrasonic pulse is calculated, and the distance of the object is found.

Bats use a well-known method to measure the distance while traveling.

The ultrasonic level measurement principle is also used to find out fish positions in the ocean, locate submarines below water level, also the position of a scuba diver in the sea.

We will refer to Fig-1 and make an effort to understand the technicalities of the ultrasonic level transmitter.

An ultrasonic level transmitter is fixed at the top of a tank half filled with liquid.

The reference level for all measurements is the bottom of the tank.

The level to be detected is marked as “C”, and “B” is the distance of the ultrasonic sensor from the liquid level.

Ultrasonic pulse signals are transmitted from the transmitter, and it is reflected back to the sensor.

The travel time of the ultrasonic pulse from the sensor to the target and back is calculated.

Level “C” can be found by multiplying half of this time with the speed of sound in the air.

The measuring unit’s final result can be centimeters, feet, inches, etc.

Level = Speed of sound in air x Time delay / 2

Ultrasonic Level Measurement
TipYou can see our range of Ultrasonic Level Transmitters here.

Practical System Design Problems of Ultrasonic Level Transmitter:

The above principle of measurement looks quite straightforward and true only in theory.

In practice, there are some technical difficulties that are to be taken care of to get the correct level of reading.

  1. The velocity of sound changes due to the variation of air temperature.
    • An integrated temperature sensor is used to compensate for changes in the velocity of sound due to temperature variations.
  2. There are some interference echoes developed by the edges, welded joints, etc.
    • This is taken care of by the software of the transmitter and called interference echo suppression.
  3. Calibration of the transmitter is crucial.
    • Accuracy of measurement depends on the accuracy of the calibration.
    • The Empty distance “A” and measurement span “D” is to be ascertained correctly for inclusion in the calibration of the transmitter.
  4. The transient characteristics of the sensor will develop a Blocking distance as shown in Fig-1. Span “D” should never extend to the blocking distance.

The Basic Structure of an Ultrasonic Transducer:

structure of an Ultrasonic Transducer

An ultrasonic sensor is the heart of the ultrasonic level Transmitter instrument.

This sensor will translate electrical energy into ultrasound waves.

Piezoelectric crystals are used for this conversion process.

Piezoelectric crystals will oscillate at high frequencies when electric energy is applied to it.

The reverse is also true.

These piezoelectric crystals will generate electrical signals on receipt of ultrasound.

These sensors are capable of sending ultrasound to an object and receiving the echo developed by the object.

The echo is converted into electrical energy for onward processing by the control circuit.

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

Functional Block Diagram of a Typical Ultrasonic Level Transmitter:

We will refer to Fig-3 Functional Block Diagram to clarify the physical structures of an Ultrasonic Level Transmitter.

A micro-controller-based Control Circuit monitors all the activities of the ultrasonic level transmitter.

There are two Pulse Transmission Circuits, one for transmitter pulse and the other one for receiver pulse.

The pulse generated by the transmitter pulse is converted to Ultrasound pulses, by the Ultrasonic Sensor(Transmitter) and targeted towards the object.

This ultrasound pulse is reflected back as an echo pulse to the Ultrasonic Sensor (Receiver). The receiver converts this Ultrasonic pulse to an electrical signal pulse through the pulse generator.

The time elapsed, or the reflection time is measured by the counter. This elapsed time has relation to the level to be measured. This elapsed time is converted to level by the Control Circuit. There is a Timing Generator Circuit which is used to synchronize all functions, in the ultrasonic level measurement system.

The level is finally converted to a 4-20mA signal. 4mA is 0% level, and 20mA is the 100% level (see Fig-1).

This 4-20mA output signal carrying the level data can be transmitted to long distance to Process Control Instruments.

Functional Block Diagram for clarify physical structures of an Ultrasonic Level Transmitter.

Common Applications for Ultrasonic Liquid Level Sensors

Ultrasonic liquid level sensors are used for liquid level, solid material level, the tank body, and open channel flow. Their performance is very good. Ultrasonic level sensors are also ideal for applications where continuous level measurement is required.

The most popular application of ultrasonic level sensors is to measure the level of liquid in tanks, wells, pits or lakes.If the container is linear, extrapolating the volume measurement is easy. In a non-linear container, a strapping table is usually used to adjust the reading to a certain volume as the level increases and decreases. Most of our ultrasounds are specifically designed for level measurement.Find the right sensor for you. Since ultrasonic sensors work without the need to touch the medium, they are ideal for difficult or corrosive liquids. Such as acids, wastewater, and others.

Read more about: Ultrasonic Level Sensors for Liquids Applications

Typical Media:

  • Acids
  • Wastewater
  • Inks and Paints
  • Slurries
  • Food and Beverage
  • Semiconductor Process Chemicals
  • Oils and Petroleum Distillates

Another very popular application of ultrasonic sensors is solid level detection. The trick is actually to use a sensor with twice the required distance. This gives you a stronger signal, which in turn provides a better echo for the sensor’s measurements. You may also need to tilt the sensor mount so that it is perpendicular to the angle of repose.
Measuring solids has always been difficult. But ultrasound will still be the main condition for continuous non-contact measurement.

Open channels are the main means of transporting, filtering, and metering water. Open channel flow monitoring is used in water treatment plants, environmental monitoring, and irrigation canals. Ultrasonic sensors are an excellent choice for open channel flow.

Extended reading: Case Study: Automatic Sludge Blanket Level Detector

Read more about: Top 5 Ultrasonic Level Sensor Applications

Liquid Level Measurement with Ultrasonic Sensors

Tank level sensor

Tank level senor is a level sensor used to measure the tank level. The liquid level is the level of the liquid in a sealed container (such as a water tank) or an open container (water tank). The instrument that measures the liquid level is called a liquid level sensor, a liquid level gauge or a liquid level transmitter. The liquid level sensor is a kind of level instrument. Hydrostatic, Ultrasonic, Magnetostrictive, Radar, Differential Pressure are commonly choices for tank level measurement. Liquid level sensors have been around for decades for leak detection or level measurement. Common measured medium are: Water, Fuel, Diesel, Gasoline, diesel, liquefied gas, liquid ammonia, etc.

Ultrasonic level sensor wastewater

The ultrasonic level gauge is widely used in water level meter measurement projects in: Water plants. Wastewater treatment plants. Chemical reagent plants. Dye factories. Pulp mills and other factories. And is one of the main level measurement methods in modern intelligent automation industry. Ultrasonic technology has been used in the wastewater industry for more than 30 years for its high cost performance. Level gauges are widely used in industrial wastewater treatment plants and municipal wastewater treatment plants. Ultrasonic level gauges have the most applications, but their installation and measurement are limited by space.

In addition, since the propagation time of sound waves is affected by temperature, the ultrasonic sensor must be equipped with a temperature sensor. Ultrasonic level gauges are more accurate when used indoors or at groundwater levels.

Outdoors, the ultrasonic sensor generates heat due to sunlight. This will lead to inaccurate compensation for the propagation time of the sound waves, which will cause measurement errors. In chemical plants, there are a lot of high-concentration gases over chemical liquids, which will also change the propagation time of sound waves and even absorb sound waves. The shortest distance that an ultrasonic sensor can measure is usually 10-50cm. When installing, consider the “blind zone” that cannot be measured.

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Ultrasonic Level Sensor for Solids

Liquid level and material level measurement is a problem often encountered in the industry. Ultrasonic positioning technology has many advantages. It can not only locate and continuously locate but also conveniently provide the signals required by telemetry or remote control. Compared with radioactive positioning technology, ultrasonic technology does not require protection. Compared with laser-ranging technology, it has the advantages of simplicity and economy. At the same time, ultrasonic technology generally does not require moving parts, so it is relatively convenient to install and maintain. .The ultrasonic level meter can be widely used in: Petroleum, mining, power plants. Chemical plants, water treatment plants. Sewage treatment stations. Agricultural water. Environmental monitoring. Food (wine industry, beverage industry, additives, edible oil, dairy products). Flood resistance Flood control, hydrological monitoring. Open channels, spatial positioning, and many other industries. There are two main installation methods for ultrasonic level gauges, one is top installation and the other is bottom installation. The ultrasonic level gauge also uses liquid sound guidance. The ultrasonic probe is installed outside the bottom of the tank. The measuring liquid is transmitted to the liquid surface and then reflected back to the probe. The propagation time is directly proportional to the level of the liquid.

Common Questions for Level Measurement Applications:

Sino-Inst offers a variety of tank level measurement solutions. If you have any questions, please contact our sales engineers. CONTACT US

Sino-Inst’s Tank level sensors easily handle these liquids. Rugged construction. Corrosion resistant materials. A wide environmental operating range and a liquid-tight IP68 ingress rating make them ideal for indoor and outdoor use. Even in salt water and hydrogen sulfide (H2S) environments.
Products are offered in a variety of distance ranges to accommodate tanks. Ranging from 6 in (15 cm) to 50 feet (15.2m), with various mounting threads and accessories available.

More

Ultrasonic level gauges work well outdoors. But we also need to protect the ultrasonic level gauge.

Ultrasonic level gauge outdoor requirements:
     1. It is recommended to install a sun visor to extend the service life of the meter.
     2. Wire and cable protection pipes should be sealed to prevent water accumulation.
     3. Although the instrument has its own lightning protection device, it is recommended to install a special lightning protection device at the inlet and outlet of the instrument when the instrument is used in a lightning-resistant area.
     4. The instrument is used in particularly hot and cold places, that is, when the ambient temperature may exceed the working requirements of the instrument, it is recommended to add high and low temperature devices around the level gauge.

Yes, Sino-Inst offer explosion-proof ultrasonic level sensors for Hazardous locations.

Explosion-proof ultrasonic level gauge has built-in temperature compensation, self-adaptive power. And can have signal processing technology, which improves the measurement accuracy of the instrument. It has obvious suppression function for interference echo. The explosion-proof ultrasonic level gauge uses a metal-aluminum alloy die-casting housing. Which has a beautiful appearance and good protection ability. The instrument uses industrial isolated power supply. And all input and output lines have lightning protection, overvoltage, and overcurrent protection circuits.Explosion-proof ultrasonic level gauge is suitable for measuring corrosive mud or sewage, hydrochloric acid, sulfuric acid, hydroxide and other corrosive media. Ultrasonic level gauge can be applied to process tanks, daily tanks, pools, etc. The position meter is mainly used in oilfield, chemical, power, metallurgy and other industries.

Ultrasonic level sensor is a digital level instrument controlled by a microprocessor. In the measurement, the pulsed ultrasonic wave is sent by the sensor (transducer). And the sound wave is reflected by the surface of the object and received by the same sensor, which is converted into an electrical signal. The distance between the sensor and the measured object is calculated from the time between the transmission and reception of the sound wave. Due to non-contact measurement, the measured medium is almost unlimited. And it can be widely used for measuring the height of various liquid and solid materials.

Sure. Ultrasonic liquid level sensors can detect water level. Like wastewater, in tank, in river.

Sino-Instrument offers over 10 level transmitters for level measurement.

About 50% of these are liquid level meters,

40% is the tank level sensor.

A wide variety of level meters options are available to you,

such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

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7 Type Tank Level Senors For Liquid and Solid

Sino-Inst produces many types of tank level sensors. Whatever your media, tank depth, and profile, Sino-Inst can always provide you with the right tank level sensors.

Tank Level Senors are also called Tank level indicators, tank level gauge, tank level meters, or tank level transmitters. Specifically refer to a type of sensor that can be used to measure tank level. The measured medium can be liquid or solid powder. Such as water, hydrochloric acid, Fuel, Diesel, Gasoline, liquefied gas, liquid ammonia, flour, cement, etc.

Featured Tanks Level Sensors

Tank Level Sensors Types:

Ultrasonic fuel tank level sensor, also called non-contact fuel meter. Ultrasonic level sensor measure continuous liquid level, fluid level, or oil level.

Ultrasonic level sensors measure the distance between the transducer and the surface. Using the time required for an ultrasound pulse to travel from a transducer to the fluid surface and back (TOF).  These sensors use frequencies in the tens of kilohertz range; transit times are ~6 ms/m.  The speed of sound (340 m/s in air at 15 degrees C, 1115 fps at 60 degrees F) depends on the mixture of gases in the headspace and their temperature.

Ultrasonic sensors work without the need to touch the medium being measured. Ultrasonic sensors are ideal for difficult or corrosive liquids such as acids, wastewater, and others. Ultrasonic level sensors are also ideal for continuous level measurement. While float switches and other sensors are adept at measuring when liquid levels are above or below a certain point. The nature of ultrasonic level measurement is such that levels can be sensed and displayed in real-time.

More about Ultrasonic level measurement

Features of Ultrasonic Tank Level Sensor

  • Non-contact – nothing touches the liquid
  • Easy to install at the top of the tank into standard fittings
  • Use indoors or outside, in metal or plastic tanks
  • Connects to other industrial equipment
  • Measures a wide variety of liquids and liquid environments
  • Accessories to display, alarm, and control liquid levels
  • Wireless option sends tank levels to a LAN or the cloud
  • MRO & OEM tank setup duplication without re-calibration

Read more about: Ultrasonic Tank Level Sensor-External Mounted

Magnetostrictive level transmitter, in-tank liquid level transmitter, is a continuous magnetic level gauge. The magnetostrictive level sensor measure the level of fluid in the vessel. By detecting the level of the magnets contained within the float and then transmits the measurement back to the control system.

Magnetostrictive liquid level transmitter is a kind of liquid level sensor. But it uses the principle of magnetostrictive operation internally. And combines modern electronic technology to measure the time value between pulse waves to achieve the purpose of accurately measuring the liquid level . The magnetostrictive liquid level meter works with waveguide pulses. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high.

Features of Magnetostrictive Level Transmitters:

  • High Accuracy
  • High Reliability
  • No calibration required
  • No Maintenance
  • Simultaneous Measurement of Multiple Process Conditions:
    -Product Level
    -Interface Level
    -Temperature
    -Volume
  • No Scheduled Maintenance or Recalibration
  • Field Repairable
  • Inherent Accuracy ±0.039” (±1 mm)
  • 200 Point Strap Table
  • API Temperature Corrected Volumes
  • Integral Display
  • Hazardous Area Certified
  • Intrinsically Safe

More about Magnetostrictive liquid level tmeasurement

Submersible level sensor, Pressure and DP level transmitter are all hydrostatic measurement devices.

Also known as pressure level transmitters, these transmitters help in determining fluid contents of a container, by measuring the pressure of the resting body of the fluid within it. The greater the force of liquid, the greater the volume of fluid.

Extended reading: Hydrostatic Level Measurement

The pressure type liquid level gauge is a pressure sensor that measures the liquid level. Including static pressure level gauge, liquid level transmitter, pressure transmitter and so on. The measured static pressure of a liquid is proportional to the height of the liquid. And the static pressure is converted into an electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal (4-20mA / 1 ~ 5VDC). Hydrostatic liquid level sensor is suitable for liquid level measurement of various media in systems and industries. Such as petrochemical, pharmaceutical, water supply and drainage, environmental protection and other systems. The exquisite structure, simple adjustment and flexible installation methods provide convenience to use.

Read more about: Submersible Level Transmitter-Straight Rod Insertion

The differential pressure level gauge is a meter that calculates the liquid level (differential pressure) in a tank. By measuring the pressure difference at two different points of the container. For example, a 500 mm water column corresponds to a pressure of 500 mmH20. In many applications, however, there is additional vapor pressure above the liquid. Vapor pressure is not part of the level measurement. So impulse tubes and capillaries with seals are needed to counteract its presence.Capillary columns and sealing systems solve many installation problems with impulse tubes. These systems include an external sensing diaphragm. This diaphgram connected to a differential pressure transmitter via an oil-filled capillary column. The change in pressure causes a displacement of the diaphragm. So that the pressure is transmitted to the transmitter through the oil-filled capillary. The oil-filled capillary system is carefully welded and manufactured. So it is a reliable sealing system. This type of structure eliminates leak points and blockages that may occur in the impulse tube.

More about Hydrostatic pressure level measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy. These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Radar Level Sensor Features

  • Non-contact, continuous level measurement over larger ranges
  • Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
  • Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
  • Simple mounting and push-button calibration

More about Radar level measurement

Capacitance level detectors, also known as Capacitance level transmitter. RF Capacitance Level Transmitter offers continuous and point level detection. In liquids and solids with capacitance probes. These transmitters use liquid stored in a tank or container as a dielectric medium between two or more electrodes. The energy capacity of the capacitor circuit increases when there is more liquid, and decreases if there is less liquid. Measuring the variations in the capacitance value, capacitance level transmitters calculate level of the tank.

Features of SI700 RF capacitance level transmitter:

  • Capacitive level measurement enables measurement without blind spots over the entire sensor length
  • Fully insulated capacitive sensors also measure aggressive liquids
  • Cost-effective measurement for trouble-free and maintenance-free operation

More about capacitance level measurement

These gauges are the preferred replacement for the sight glasses. They are similar to float devices, but they communicate the liquid surface location magnetically.  The float, carrying a set of strong permanent magnets, rides in an auxiliary column (float chamber) attached to the vessel by means of two process connections.  This column confines the float laterally so that it is always close to the chamber’s side wall. As the float rides up and down the fluid level a magnetized shuttle or bar graph indication moves with it. Showing the position of the float and thereby providing the level indication.  The system can work only if the auxiliary column and chamber walls are made of non-magnetic material.    

Sino-Inst provides float designs optimized for the specific gravity of the fluid being measured. Whether butane, propane, oil, acid, water, or interfaces between two fluids, as well as a large selection of float materials. This means the gauges can handle high temperatures, high pressures and corrosives fluids. Oversized float chambers and high-buoyancy floats are available for applications where buildup is anticipated.

Chambers, flanges and process connections can be made from engineered plastics. such as Kynar or exotic alloys such as Hastelloy C-276.  Special chamber configurations can handle extreme conditions. Such as steam jacketing for liquid asphalt, oversized chambers for flashing applications, temperature designs for liquid nitrogen and refrigerants. Numerous metals and alloys ( titanium, Incoloy and Monel ) are available for varying combinations. Like high-temperature, high-pressure, low-specific-gravity and corrosive-fluid applications.  Magnetic level gauges can also be outfitted with magnetostrictive and guided-wave radar transmitters. This allow the gauge’s local indication to be converted into 4-20 mA outputs and digital communication. That can be sent to a controller or control system.

Float level gauge is mainly composed of magnetic float, sensor and transmitter. When the magnetic float ball changes with the liquid level and floats up and down along the catheter. The magnetic steel in the float ball attracts the reed switch at the corresponding position in the sensor. Which changes the total resistance (or voltage) of the sensor. The transmitter then converts the changed resistance (or voltage) signal into a 4-20mA current signal output.
The float ball level gauge uses a magnetic float ball as a measuring element. Which makes the resistance in the sensor change linearly through magnetic coupling. The smart converter converts the resistance change into a 4-20mA standard current signal. It can display the percentage of liquid level, the current of 4 ~ 20mA and the value of liquid level. Remote transmission control room can realize automatic detection, control and recording of liquid level. The instrument is suitable for the sewage treatment of petroleum, chemical, power, light industry and pharmaceutical industries. And the measurement of the medium level in various atmospheric and pressure vessels. It is especially ideal for the liquid level measurement of underground storage tanks and storage tanks.

Features of Float level transmitters:

  • Suitable for the measurement of the liquid level and interface of the liquid medium in the container. In addition to on-site instructions, it can be equipped with remote transmitters, alarm switches and complete detection functions.
  • Innovative indication, intuitive reading, eye-catching, observing the direction of the indicator can be according to user needsChange the angle.
  • Large measuring range, not limited by the height of the storage tank.
  • The indicating mechanism is completely isolated from the measured medium, with good sealing, high reliability and safe use.
  • Simple structure, easy installation, easy maintenance, corrosion resistance, no power supply required, explosion-proof. At the lower limit, the float floats upright on the water.

Extended reading: Diesel fuel tank level gauges & indicators

After understanding these 7 types of Tank Level Senors, if you are experienced, you can purchase Tank Level Senors on the product details page. If you are new to this, then perhaps you need to continue to consider the measurement medium and monitoring requirements.

The following content is based on our many years of experience in liquid level measurement services. We at Sino-Inst have long been providing users with various tank level measurement solutions.

First, we recommend that you consider the measuring medium. For example, the most common measurement is the liquid level of water and diesel.

Water Tank Level Sensor

The water level sensor of your water tank is an essential component. If not repaired or replaced, a sensor can become damaged over time and fail entirely. Too much water can cause a malfunction and too little water means inadequate water pressure. Either way, repairing or replacing holding tanks is an expensive task you shouldn’t have to undertake because of sub-par sensors.
With Sino-Inst’s water tank level sensors, there’s nothing to break down or rust and our models have a 99% success rate!

In the high unlikely event that you experience any issues with your product, call us and we’ll replace or repair it immediately at no charge.

Read more about our water tank level sensors and control systems.

Hydrostatic pressure for Water level measurement

SI-151 Hydrostatic Level Sensor
SMT3151TR Hydrostatic level transmitter-Rod Type
SI-PCM260 Deep Well Water Level Sensor

Extended reading: Hydrostatic Pressure Transmitter

Diesel storage tanks -Explosion Proof level sensors

For diesel, gasoline, or other oils that require explosion-proof storage tanks. Liquid level measurement requires level sensors to meet explosion-proof requirements.

For example, explosion-proof ultrasonic level meter, explosion-proof radar level meter, etc.

non-contact tank level sensors

Of course, there are many cases where we need to measure chemical liquids, such as hydrochloric acid, liquid ammonia, etc.

Chemical Tank Level Measurement

Sino-Inst Tank level sensors expand the range of environments in which our sensors operate. Some common chemicals can damage or corrode sensor materials, even 316 stainless steel. Transducer elements and bonding adhesives are also susceptible. Our tank level sensors avoid these problems by using a continuous injection molded housing of Polyvinylidene fluoride (PVDF), a highly non-reactive thermoplastic that resists solvents, acids and hydrocarbons.

Tank level sensors have both top and bottom mounting threads and include a potted-in, PUR-jacketed, UV resistant cable. Verify your chemicals and operating temperatures with this compatibility chart. All ToughSonic sensors include analog, switch and data interfaces and compatible setup software, included at no charge.

Extended reading: Corrosive Liquid Chemical Level Sensor in Chemical Processing

OK. Once you know your measuring medium. Then you need to identify your monitoring needs. For example, you need to transmit the liquid level signal to the PLC system through 4-20mA.

All tank level sensors mentioned in this article can output 4-20mA.

The 4-20 mA current loop is the prevailing process control signal in many industries.It is an ideal method of transferring process information. Because the current does not change as it travels from the transmitter to receiver. It is also much simpler and cost-effective.However, voltage drops and the number of process variables,that need to be monitored can impact its cost and complexity.By knowing these fundamentals you will be able to make more informed decisions about process control in your facility. Which could affect your bottom line.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

An analog signal refers to information represented by a continuously changing physical quantity. The amplitude, frequency, or phase of the signal changes continuously over time, or the characteristic amount of the representative information can be presented at any instant as a continuous time interval. Any value signal.

Sino-Inst’s tank level gauge provides multiple output modes, including analog voltage and current, digital, RS485, etc. The output signal can provide a position, multiple positions, or a position plus a temperature output. The detailed multi-function output mode provides customers with more choices.

Extended Reading: How to Measure Volume of Liquid

Continuous level sensors provide level monitoring of an entire system. They measure liquid level in a range, rather than at a single point, outputting an analog signal that correlates to the liquid level inside your tank or vessel.

Extended reading: What is a capacitive liquid level sensor?

If you do not have a monitoring system similar to a PLC, but you need to monitor the tank level in the office, you can configure our level-volume recorder.

Extended reading: GWR Solid Level Sensor-Cement silo-Ash powder measure

Featured Continuous level sensors

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch

Tank Level Sensor Industries & Applications

Continuous level transmitters are versatile in monitoring liquid level needs. They can monitor water, diesel, lube oils and fuels, as well as various chemical and petrochemical liquids.

Storage tanks are widely used in the fluid industry to store raw materials, finished products, and intermediate products. They have an irreplaceable role in ensuring the safe production of equipment, energy-saving and emission reduction and improving the overall management level. National strategic reserves are also inseparable from various types of Storage tanks. 

Industrial storage tanks are generally steel storage tanks. Carbon steel, low-temperature steel, stainless steel, and other materials are selected according to the characteristics of the storage medium, storage temperature, pressure, and other parameters. Other materials such as FRP and plastic are not considered due to fire and pressure resistance.

Common liquid level sensor application tank level monitoring:

  • Chemical injection
  • Hydraulic and lube oil tanks
  • Drilling fluid (mud) tank monitoring
  • Liquid level monitoring during transfer
  • Food and Beverage
  • HVAC
  • Medical
  • Printing (Ink Handling Systems)
  • Off-Highway Vehicles
  • Semiconductor

Extended reading: Types of Fuel-Diesel Level Sensors

How Tank Level Sensors Work?

The level of the liquid medium in the container is called the liquid level. And the instrument that measures the liquid level is called the liquid level transmitter. Level transmitter is a kind of level instrument.

There are two types of level transmitters, one is continuous and the other is point-off. The continuous level transmitter is a real-time monitor of the height of the liquid in the container. The point type, which generally takes two points, high and low, and outputs an alarm signal when the medium in the container reaches these two points. The types of liquid level transmitters are very wide. Specific include magnetic flap liquid level gauge, tuning fork vibration type, differential pressure type, pressure type. Ultrasonic, magnetostrictive liquid level gauge, magnetic flap, radar, and so on.

Levels of media such as: water, viscous fluids, and fuels, or dry media such as bulk solids and powders can be measured using the transmitter.

Level measurement transmitters are used in a myriad of applications that require level measurement within containers or tanks. These transmitters often find their application in material handling, food and beverage, power, chemical, and water treatment industries.

About Level Sensor Types and how they work, OMEGA Engineering has a good explanation. Video source

Technical Support


Q&A

Fluid level sensors are termed as the sensors used for detecting liquid levels or interfaces between liquids. Such as water and oil or solids and liquids. These sensors can also be defined as transducers or as integrated systems with instrumentation and control capabilities. This type of fluid level sensor is one of the most important sensors. Fluid level sensor plays a vital role in a variety of industrial and applications.

Industrial applications include fluid-level sensing in transport tanks, storage tanks and water treatment tanks. And also in the petrochemical industries for sensing liquids. Such as petrol, diesel and other fuels. Liquid level measurement is significant in household applications. Including electronic devices. Such as, water dispensers, water evaporators, steamers.

The monitoring system of boilers, heating systems. Washing machines, steam irons, juice squeezers, automated coffee machines, etc.

Fluid Level sensors are designed for specific applications compared to general applications.

Extended reading: Diesel Tank Level Monitoring System

Point level sensors are devices that detect variation in liquid levels. And the levels are based on the presence or absence of liquid media at various points in a vessel or tank. Most often, the function of point level sensors is: High level or low-level alarms. Spill-prevention sensors. Pump protection alarms. Or pump control components.

In the simplest terms, point level sensors operate in either an on or off state. And point level sensors are used to control external devices that share an on/off functionality.
Examples of liquid level sensors that can work as point-level sensors:

Fuel tank level measurement can be achieved by using fuel level sensors. These Fuel level sensors work on a hydrostatic pressure principle. By installing a sensor at the base of the fuel tank can associate the pressure created by the level of fuel above the device. And this has a direct relationship to the level by a simple calculation. This calculation can be seen by using the Impress conversion software here.

The things to consider when selecting a fuel level sensor is that the materials used are compatible with the type of fuel you have so for instance on the submersible devices you must make sure that the pressure diaphragm, O ring seals, housing material and Cable sheath are all suitable for complete submersion in the fuel.

Typically we would suggest using a PTFE or FEP cable sheath but for petrol or gasoline although a specially made Hytrel cable may be necessary.

If the installation is a screw-type fitting in the base of the tank then just the housing, O ring seal, and diaphragm are of concern. Ceramic pressure sensor or stainless steel silicon pressure sensors are fine and a stainless steel housing are recommended.

Ultrasonic Sensors are good choice for Water Level Measurement.

The water and wastewater industry has many requirements for measuring the level of water. In applications such as flumes, weirs, pipes, tanks, wells, basins, and cooling towers. Ultrasonic sensors are reliable, cost-effective instruments for these applications. In operation, the sensor is mounted over the water. To determine the distance to the water, it transmits a sound pulse that reflects from the surface of the water. And measures the time it takes for the echo to return.

Sometimes structural components, such as a small pipe, are located in the acoustic path between the ultrasonic sensor and the water. They can reflect a portion of the sound and produce a false echo that interferes with the ability of the sensor to properly detect the echo from the surface of the water. Advanced ultrasonic sensors can be adjusted to ignore these false echoes, which therefore enables them to provide accurate water level measurements.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

There are 7 main types of level transmitters that Sino-Instrument offers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

  • Capacitance Level Transmitters
  • Hydrostatic Level Transmitters
  • Magnetic Level Transmitters
  • Radar Fill Level Transmitters
  • Ultrasonic Level Transmitter
  • Guided Microwave Level Transmitters
  • Liquid Level Transmitters

Let’s take a closer look at how different types of level transmitters work.

Read more: What is level transmitter working principle?

Sino-Inst offers over 10 level transmitters for level measurement.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

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Hydraulic Oil Flow Meters

The hydraulic flow meter is mainly for inline hydraulic system instantaneous flow test and high-pressure test. Industrial Hydraulic oil flow meter, also called hydraulic flow gauge.

Sino-Inst offers Turbine, Mass flow, Oval gear, V-cone, Target, and Orifice flow meters for inline hydraulic oil flow. Features like: bidirectional, high pressure, analog, can be customized as customer need.

Sino-Inst offers a variety of hydraulic oil flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Hydraulic oil flow meters measure the flow of oil in machines. They are important in many industries. These meters help machines work well, last longer, and avoid breaking down. Industries like car-making, mining, and oil & gas use them. Hydraulic oil flow meters are needed for accurate measurements and to keep machines running smoothly.

Featured Hydraulic Flow Meters for Sale

Sino-Inst offers great prices for hydraulic oil flow meters. For example, a turbine flow meter for hydraulic oil:

  • Size: DN50
  • Max pressure: 16 bar
  • Signal output: 4-20mA
  • FOB Price: USD 585.00/set

Please note, this price is just an example. The actual price depends on the user’s specific measurement needs.

Hydraulic oil is the hydraulic medium.

Hydraulic oil is used in hydraulic systems that utilize fluid pressure energy.

Its role is Energy transfer, anti-wear, system lubrication, Anti-corrosion, anti-rust, cooling, etc.

1. Hydraulic systems for automobiles and construction machinery use hydraulic oil as the working medium. In this type of hydraulic system, the fluid velocity is not large and the pressure is high, so it is called static pressure transmission.

2. Hydraulic oil is widely used, and it is the most used product in industrial oil. Hydraulic components are developing in the direction of small size and high power. The system pressure is getting higher and higher, and some have exceeded 50 MPa.

More:

  1. Hydraulic pressure is a term for the machinery industry and electromechanical industry. Hydraulic power can be powered by hydraulic power. Hydraulic pressure can also be used as a control method, which is called hydraulic pressure control.
  2. Hydraulic principle In certain mechanical and electronic systems, the static pressure of the liquid medium is used to complete the backlog, transfer and amplification of energy. Achieve lightweight, scientific, and maximized mechanical functions.
  3. In the hydraulic system, due to some reason, the liquid pressure suddenly rises suddenly at a certain moment, and a high-pressure peak is formed. This phenomenon is called hydraulic shock.
  4. Select the type of hydraulic oil according to the working environment and working conditions. When selecting the hydraulic oil used in hydraulic equipment. It should be comprehensively considered and judged from several aspects such as working pressure, temperature, working environment, hydraulic system and component structure and material, and economy.

Extended reading: High Temperature Flow Meter

The hydraulic flow meter is a flowmeter that can measure hydraulic oil. The hydraulic flow meter is a name called according to the measurement medium in the industry.

There is no hydraulic oil flow meter in the strict sense. It is not accurate to say which flowmeter is a hydraulic flow meter. Which one to use depends on the specific flow measurement conditions.

For example, the hydraulic oil is also labeled, 40 #, 46 #, or other viscosity properties. Then choose a suitable flow meter according to the relevant information such as flow, pressure, viscosity, and so on.

Read more about: What is a Flow Meter? Types and how does it work?

Here are some common types of hydraulic oil flow meters and what they do:

  • Gear Flow Meters: These meters have gears that rotate to measure oil flow. They work well with thick fluids.
  • Turbine Flow Meters: These meters use a spinning part to measure flow. They work with different flow rates and clean fluids.
  • Variable Area Flow Meters: Also called rotameters, these meters use a tube and a moving float to measure flow. They’re simple and work with many fluid types.
  • Positive Displacement Flow Meters: These meters measure fluid flow by trapping and counting fluid. They’re accurate and good for thick fluids like hydraulic oil.
  • Mass Flow Meters: These meters measure the mass of fluid flowing through a system instead of volume. They are useful in situations where fluid density changes can impact the accuracy of volumetric flow meters.
  • Ultrasonic Flow Meters: These meters use sound waves to measure flow without touching the fluid. They’re good when you want to avoid fluid contamination or pressure loss.

Knowing the different types of hydraulic oil flow meters helps you pick the best one for your needs.

High-Pressure Turbine Flow Meter series of turbine flow meters is ideal when measuring the flow of fluids under high pressure, such as in hydraulic testing. 

It is also perfect for chemical injection systems, as it withstands pressures up to 20,000 psi and is available in a variety of flow ranges (0.08 to 32 gallons/minute).

High Pressure Hydraulic Flow Meter
DiameterDN200~DN3000mm
Accuracy0.5% to 2.0% of reading
Temp. range-20~+150℃
Pressure40 MPa
Flow rate0.5~6m/s
Straight pipe requiredUp stream≥5DN, down stream≥3DN

The wireless flow meter is integrated with the instrument and control part on the basis of accurate measurement. Realize automatic cut-off and connection operation of the pipeline.

The wireless flowmeter avoids the liquid flowing too fast and causing damage to the instrument itself. Prevent dangerous accidents.

Wireless flow meter realizes the operation of automatic two-way flow measurement. Instantaneous flow on site. Total forward and reverse total display. Self-diagnostic fault alarm. Full use of GSM / GPRS data wireless remote transmission and other functions to realize wireless remote transmission of flow data, Storage and other functions.

GSM / GPRS remote monitoring and management software system is matched with wireless remote transmission flowmeter with remote transmission function.

This system can query, statistics, analyze and display the water consumption situation and pipeline pressure of each measurement point in the form of charts or curves.

Users can easily manage water consumption at each measurement point. When abnormal water conditions occur at the measurement point or the battery capacity of the on-site flow meter is insufficient. The system can issue an alarm message.

  • Can display the meter’s flow rate, flow rate, cumulative quantity, pressure, working status, and other data.
  • Can print all the data of the query directly.
  • Can directly export the data of all meters to the computer.
  • Can directly see the flow curve of the query meter. Directly print out the flow curve graph.
  • You can check the working status of the field instrument and whether the instrument has an alarm condition.
  • Can display the annual, monthly, and daily water consumption of all the instruments in the form of a report. You can directly print the report.
  • You can directly export the report to the computer. All meter data can be backed up directly to the computer.

Extended Reading: Insertion Flowmeter Types

You may like: High-Temperature Oval Gear Heating oil Flow Meter

How to use a hydraulic flow meter?

  • A flow meter can be placed in any location of the hydraulic line to detect the flow rate. Flow meters with variable port sizes are available that are suitable for different hydraulic systems.
  • When the hydraulic system operates, the fluid is passed towards the flow meter.
  • A flow meter mainly contains 3 parts; the primary device, a transducer and a transmitter. The transducer senses the hydraulic fluid passing through the primary device.
  • And a usable flow signal is generated by the transmitter when the sensed signal is sent by the transducer.
  • The volume is calculated based on the principle that the volume of fluid passing is directly proportional to the cross-sectional area and the fluid velocity.
  • Also, the mass flow is directly proportional to fluid density and volume.
  • Then, this calculated hydraulic measurement is displayed on the hydraulic flow meter gauge.
  • All standard hydraulic oil flow meters supports unidirectional flow.
  • But, reverse flow by-pass options are also available with some selected flow meters.
  • Selecting a hydraulic flow meter is a difficult procedure. A wrong selection will cause errors in the diagnosed result.
  • The factors that need to be considered while selecting a hydraulic flow meter are:
    • the hydraulic fluid properties.
    • operating condition of the hydraulic system.
    • the need for measuring flow.
    • the level of accuracy required.
    • the effect of fluid on flow meter and vice-versa.
    • and finally the budget.

More about inline oil flow meter

Digital inline oil flow meter

What is an inline flow meter?

The online flow meter is actually a flow meter displayed on the spot. At present, all integrated flow meters are online flow meters. All have local display function.

For example, the split-type flowmeter has no local display function. Its meter head and sensor are connected through conduction, and the online flowmeter is the mainstream measuring instrument in current flow measurement.

What are the advantages of online flow meters in the flow measurement process? In some measurements with a control system, the advantage of the online flowmeter is not great. Because the size of the flow can be monitored through the PLC system. And there is no PLC system in the working condition. The online flowmeter can show its advantages, and it can display the accumulated flow and instantaneous flow online.

Read more about: Find your suitable industrial oil flow meter with best price

Inline hydraulic oil flow meter

Inline hydraulic oil flow meter measures the hydraulic oil flow directly on the pipeline, and then displays the flow on the meter.

Hydraulic oil flowmeter is a flowmeter that can measure hydraulic oil. It is the name given by the industry based on the measurement medium. There is no hydraulic oil flow meter in the strict sense.

It is foolish to say which flowmeter is the hydraulic oil flowmeter.

Which one to use depends on the specific working conditions. For example, hydraulic oil also has a label, is it 40#, 46# or other viscosity properties. It is necessary to see clearly, and then select an appropriate flow meter based on the flow, pressure and other related information.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

Oil Flow Meter Types

At present, the following types of flow meters can be used to measure oil:

Turbine flow meters. Gear flow meter. Vortex flowmeter. Ultrasonic flow meter. Mass flowmeter. Differential pressure flow meters.

Read more: Top 8 petroleum flow meters for Measuring Oil and Gas

Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

How to Select Hydraulic flow Meter?

When searching for a flow meter for use in a particular hydraulic application, these five questions can help:

  1. What are the fluid properties?
  2. What is the hydraulic system operating condition
  3. Why is flow being measured; how accurately does the flow measurement need to be?
  4. What effect might the flow meter have on the fluid and vice-versa?
  5. How important is it to measure flow;
  6. What is your budget?

Extended Reading: Mechanical oil flow meter

Technical Support

The D represents the diameter of the pipe. For the orifice plate in the orifice plate flowmeter, the minimum requirements for the front and rear straight pipe sections are 10D Upstream and 5D Downstream. If there is a pump or regulating valve in front of the orifice plate, then the requirements for the straight pipe section are greater.

There are many types of flow meters.

According to the different structural principles of the flowmeter, it is divided into:

  1. Differential pressure flowmeter: orifice plate, bar type such as Annubar, V cone, wedge type, elbow, nozzle, target type, etc.
  2. Variable area flowmeter: rotor, open channel, etc.
  3. Velocity flowmeter: electromagnetic, ultrasonic, turbine, vortex street, precession vortex, rotor, etc.
  4. Positive displacement flowmeter: waist wheel, oval gear, piston, scraper, etc.
  5. Mass flowmeter: Coriolis, thermal, etc.

Extended reading: Metal Tube Flow Meter-Variable Area Flow Meters Principle

Flow is the amount of fluid that passes through a pipe or device at a cross-section in a unit of time. This quantity is expressed by mass and is called mass flow. Expressed by volume, called volume flow. Expressed by weight, called weight flow.

Because the density of a fluid changes with changes in the state parameters of the fluid, the volume state must be given while specifying the state of the fluid.

Especially for gas, its density varies significantly with pressure and temperature. In order to facilitate the comparison of the volume flow rate, the volume flow rate in the working state is often converted to the volume flow rate in the standard state (temperature is 20 ° C and absolute pressure is 101325Pa).

Commonly used flow measurement methods include speed-type flow measurement methods, volumetric flow measurement methods, and direct or indirect methods to measure the mass of fluid flowing through the cross section of the pipe per unit time.

In the above method, more speed-type flow measurement method instruments are applied.

Except for the standard throttling device which does not need to be tested for the current flowmeter, almost all other flowmeters need to be calibrated when leaving the factory. During the use of the flowmeter, it should also be calibrated frequently.

The volume method is most commonly used. This is a method of measuring the volume of fluid flowing into a constant volume container within a measurement time to obtain the flow rate.

The mass method is a method of weighing the mass of a fluid flowing into a container within a measurement time to obtain a flow rate.

During calibration, a pump is used to draw the test fluid from the liquid storage container through the calibrated flowmeter and enter the liquid container.

The temperature of the fluid is measured while the weight is weighed to determine the density of the measured fluid at that temperature.

Divide the weight of the measured fluid by the density of the fluid at the measured temperature to obtain the volume of the fluid.

Comparing it with the meter’s volume indication (accumulated pulse number), the meter constant and accuracy of the calibrated flowmeter can be determined. The accuracy of this system can reach 0.1%.

The working principle of the standard volume tube method is based on the volumetric method (standard volumetric method), but it is a dynamic measurement.

The standard flowmeter comparison method is to connect the calibrated flowmeter and the standard flowmeter in series to the pipeline flowing through the test fluid, and compare the two measured values ​​to find the error. The accuracy of the standard flowmeter is 2 to 3 times higher than that of the calibrated flowmeter.

Where are flow meters used? Or, What does a flow meter measure?

At industrial sites, meters that measure fluid flow are referred to as flow meters or flow sensors.

It is one of the most important instruments in industrial measurement.

With the development of industry, the accuracy and range of flow measurement requirements are getting higher and higher.

In order to adapt to various purposes, various types of flowmeters have been successively launched,

widely used in oil and gas, petrochemical, water treatment, food and beverage.

Industries such as pharmaceuticals, energy, metallurgy, pulp and paper, and building materials.

  1. Measurement of gas mass flow in industrial pipelines
  2. Smoke flow rate measurement from the chimney
  3. Calciner flue gas flow measurement
  4. Air flow measurement during gas process
  5. Compressed air flow measurement
  6. Gas flow measurement during semiconductor chip manufacturing process
  7. Gas flow measurement in sewage treatment
  8. Gas flow measurement in heating ventilation and air conditioning systems
  9. Flux recovery system gas flow measurement
  10. Measurement of combustion gas flow in a combustion boiler
  11. Gas flow measurement of natural gas, flare gas, hydrogen, etc.
  12. Measurement of carbon dioxide gas flow during beer production
  13. Measurement of gas mass flow in the production process of cement, cigarette and glass factory
  14. Open channel

Flowmeters are devices that measure the rate of liquid, gas or vapor that passes through them.

Some flowmeters measure flow as the amount of fluid passing through the flowmeter during a time period (such as 100 liters per minute).

Other flowmeters measure the totalized amount of fluid that has passed through the flowmeter (such as 100 liters).

Flow measurement can be described by :
Q = A x v

Q is flow rate, A is the crosssectional area of the pipe, and v is the average fluid velocity in the pipe.

Putting this equation into action, the flow of a fluid traveling at an average velocity of a 1 meter per second,

through a pipe with a 1 square meter cross-sectional area is 1 cubic meter per second.

Note that Q is a volume per unit time, so Q is commonly denoted as the “volumetric” flow rate.

Now consider the following equation:
W = rho x Q

Where W is flow rate (again – read on), and rho is the fluid density.

Putting this equation into action, the flow rate will be 1 kilogram per second,

when 1 cubic meter per second of a fluid with a density of 1 kilogram per cubic meter is flowing.

(The same can be done for the commonly-used “pounds”. Without getting into details — a pound is assumed to be a mass unit.)

Note that W is a mass per unit time, so W is commonly denoted as the “mass” flow rate.

Now — which flow do you want to measure? Not sure? In some applications, measuring the volumetric flow is the thing to do.

Consider filling a tank.

Volumetric flow may be of interest to avoid overflowing a tank,

where liquids of differing densities can be added.

(Then again, a level transmitter and high level switch/shutoff may obviate the need for a flowmeter.)

Consider controlling fluid flow into a process that can only accept a limited volume per unit time.

Volumetric flow measurement would seem applicable.

In other processes, mass flow is important.

Consider chemical reactions,where it is desirable to react substances A, B and C.

Of interest is the number of molecules present (its mass), not its volume.

Similarly, when buying and selling products (custody transfer) the mass is important, not its volume.

In recent years, flow measurement technology has developed rapidly. Most of the steam flow measurement uses differential pressure flowmeters and vortex flowmeters.

In practical applications, the maximum diameter of the high temperature vortex flowmeter can only be 300mm and the maximum temperature is 450℃. Therefore, in the measurement of high temperature and high pressure large-diameter steam flow, the differential pressure flowmeter still has unique advantages. For example, Annubar flowmeter, differential pressure orifice flowmeter, etc.

Differential pressure flowmeter manufacturing technology and national and international standards are quite mature. With the introduction of the multivariable transmitter dynamic full compensation intelligent technology, the accuracy of high temperature pressure and large diameter steam flow measurement has been greatly improved, and the installation and maintenance workload has been reduced.

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Sino-Inst is Manufacturer of Hydraulic Oil Flow Meters. We supply more than 20 kinds of Hydraulic Flow Meters. 50% turbine flowmeters, 20% oval gear flow meters, 20% DP flow meters and other types of flowmeters.

Hydraulic Oil Flow Meters are mainly used for flow measurement of various oils.
It can measure even liquids such as crude oil, lubricating oil, gasoline, diesel etc.

Hydraulic Oil Flow Meters enable stable flow measurement. This greatly meets the measurement needs of many applications. Can be used from small to large tubes.

Sino-Inst’s Hydraulic Oil Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a Hydraulic Flow Meters, level sensor, or other device, give us a call.

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Diesel Fuel Flow Meters

Diesel Fuel flow meters are digital flow meters for liquid fuel consumption measurement.

Most widely used types are mechanical and digital inline fuel meters. Differential flow sensors are avilable. Like: the turbine, positive displacement (oval gear), Coriolis, and differential pressure flow meters.

Sino-Inst offers a variety of fuel flow meters for most fuels. Including diesel, bio-diesel, kerosene, gasonline, oil, heating oil, grease and certain chemicals.Sino-Instrument offers diesel fuel flow measurement solutions and free technical support. If you have any question for diesel fuel flow measurement, please contact us.

Featured Inline Diesel Fuel Flow Meters

Features of Diesel Fuel Flow Meters

Turbine flow meter for Diesel Fuel

  • High performance ±1%R, ±0.5%R, high precision ±0.2%R;
  • Good repeatability, short-term repeatability of 0.05% to 0.2%
  • Output pulse frequency signal
    A very high frequency signal (3~4kHz) can be obtained, and the signal resolution is strong;
  • The medium and large caliber can reach 1:20 and the small diameter is 1:10.
  • Easy installation and maintenance, and large circulation capacity;
  • Suitable for high pressure measurement
  • Can be made into insert type for large diameter measurement
  • Low pressure loss and low price

More

Mass flow meter for Diesel Fuel

  • Double-U or double-C flow tube ensures high accuracy and customer’s requirement. 
  • Provides integrated mass flow, volum flow, density, temperature measurement and relative calculated parameter. 
  • Easy on Installation, do not need rectifier and filter parts. 
  • Fixed parts, maintenace free. High stability, no need for frequent disassembly calibration. 
  • Allow low-range operation, reducing pressure loss and energy consumption waste. 
  • Integrated installation, low installation costs. 
  • Extremely high accuray and long-term stability, could be used for business transaction. 
  • Ultra-wide measure range, could measure gas accurately (gas mass flow meter). 
  • Transmitter can be exchanged, and will not be influenced by area temperature.

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Annubar Flow Meter for Diesel Fuel

  • Honeycomb hexagonal stable structure,increasing the range ratio.
  • Suitable for square or rectangular pipes.
  • For the unavoidable clogging problem of similar products in measuring dirty media, achieve non-stop production maintenance.
  • Average speed tube + three valve group + temperature pressure compensation + transmitter, form an integrated structure, easy to use.
  • No flow coefficient drift, long-term stability.
  • Exclusively provide intuitive resonance check to ensure long-term stable operation.
  • Low pressure loss, low energy consumption, significant energy saving effect.
  • Easy to install and save labor, low price and fast delivery (1 week)

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Orifice Flow Meter for Diesel Fuel

  • The Orifice meter is very cheap as compared to other types of flow meters.
  • Less space is required to Install and hence ideal for space-constrained applications
  • The operational response can be designed with perfection.
  • Installation direction possibilities: Vertical / Horizontal / Inclined.

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Venturi Flow Meter for Diesel Fuel

  • Less head loss than an orifice or nozzle meter, due to the streamlined design
  • Ideal for clear gas, liquid or steam applications
  • Available in many materials and end arrangements
  • Can be equipped with fittings to accept secondary instrumentation packages

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You may like: Digital Flow Meters Guide| Liquid and Gas

Diesel Fuel Flow Meters Applications

Diesel, bio-diesel, kerosene, gasoline.

Petroleum, organic liquid, inorganic liquid.

Liquefied gas, natural gas, coal gas.

Oil, DEF, heating oil, grease and certain chemicals, low temperature fluid flow measurement.

Extended reading: More Inline Digital Diesel Fuel Flow Meters

Fuel flowmeter refers to the flowmeter used to measure the flow rate of fuel. Commonly referred to as turbine flow meters and oval gear flow meters.

A flow meter is used to measure the quantity of fluid that has been moved during the transfer process. They have a visual display, which can be either mechanical or digital, for the user to read off the measurement. Flow meters are used within a variety of fluid transfer applications. And therefore whilst they are always used to measure the fluid, the ways in which they work are slightly different.
Of course, the fuel flow meter also has some characteristics of its own, such as:
Explosion proof
Pulse output
Unaffected by changes in fluid density, viscosity, temperature, pressure, and conductivity.

If you need more accurate measurement, you can choose a mass flow meterCoriolis mass flowmeters have zero drift but the impact is relatively small. Higher operating costs. Mass flow meters can measure temperature and density online. Oval gears are relatively stable for mechanical flow meters.

Turbine Flow Meters are the most widely used diesel fuel flow meters. Measure your diesel fuel or oil consumption with our fuel flow meter.

Diesel Flow Meter Working Principle

The working principle of the turbine flow meter:

Fluid flows through the sensor housing.Because the blade of the impeller has a certain angle with the flow direction, the impulse of the fluid causes the blade to have a rotating moment.

Blades rotate after overcoming frictional torque and fluid resistance.After the torque is balanced, the speed is stable.Under certain conditions, the speed is directly proportional to the flow rate.

Because the blade is magnetically permeable, it is in the magnetic field of a signal detector (made of permanent magnetic steel and coils).

The rotating blade cuts the magnetic field lines and periodically changes the magnetic flux of the coil.

Thereby, an electric pulse signal is induced at both ends of the coil.This signal is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude.

Remotely transmitted to the display instrument, show the instantaneous flow rate and cumulative amount of the fluid.In a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor.

In addition to supplying diesel flowmeters, Sino-Inst also supplies various diesel level sensors.

A flow meter is an instrument that indicates the flow rate to be measured and/or the total amount of fluid in a selected time interval. Simply put, it is a meter used to measure the flow of fluid in a pipe or open channel.

Flowmeters are devices that measure the rate of liquid, gas or vapor that passes through them.

Some flowmeters measure flow as the amount of fluid passing through the flowmeter during a time period (such as 100 liters per minute).

Other flowmeters measure the totalized amount of fluid that has passed through the flowmeter (such as 100 liters).

Flow measurement can be described by :
Q = A x v

Q is flow rate, A is the crosssectional area of the pipe, and v is the average fluid velocity in the pipe.

Putting this equation into action, the flow of a fluid traveling at an average velocity of a 1 meter per second, through a pipe with a 1 square meter cross-sectional area is 1 cubic meter per second.

Note that Q is a volume per unit time, so Q is commonly denoted as the “volumetric” flow rate.

Now consider the following equation:
W = rho x Q

Where W is flow rate (again – read on), and rho is the fluid density.

Putting this equation into action, the flow rate will be 1 kilogram per second, when 1 cubic meter per second of a fluid with a density of 1 kilogram per cubic meter is flowing.

(The same can be done for the commonly-used “pounds”. Without getting into details — a pound is assumed to be a mass unit.)

Note that W is a mass per unit time, so W is commonly denoted as the “mass” flow rate.

Now — which flow do you want to measure? Not sure? In some applications, measuring the volumetric flow is the thing to do.

Consider filling a tank.

Volumetric flow may be of interest to avoid overflowing a tank, where liquids of differing densities can be added.

(Then again, a level transmitter and high level switch/shutoff may obviate the need for a flowmeter.)

Consider controlling fluid flow into a process that can only accept a limited volume per unit time.

Volumetric flow measurement would seem applicable.

In other processes, mass flow is important.

Consider chemical reactions,where it is desirable to react substances A, B and C.

Of interest is the number of molecules present (its mass), not its volume.

Similarly, when buying and selling products (custody transfer) the mass is important, not its volume.

You may like: Industrial flow meters

Extended Reading: Petroleum Flow Meter

Flow Meters Pulse Output

The signal output by the flowmeter is generally a pulse signal or a 4-20mA current signal. Both types of signals output instantaneous flow (also used by relays to output cumulative signals. The principle is the same, and will not be repeated).

Our purpose is to PLC Calculate and display the instantaneous flow value and calculate the cumulative value. When the input signal is a pulse signal. When calculating the instantaneous flow rate, you must follow a strict time interval to ensure the accuracy of the instantaneous flow rate.

So, when calculating the instantaneous flow rate, This must be done using timed interrupts. Moreover, only one interrupt program can be run in a PLC system. No other interrupts are allowed (even low priority interrupts are not allowed to run).

Prevents interference with the accuracy of timed intervals. Calculating the instantaneous flow rate is to convert the accumulated pulse number of this time period into the accumulated flow rate. Divided by time is the instantaneous flow.

For the 4-20mA input, the instantaneous flow rate can be directly obtained by simply converting according to its corresponding range. The cumulative flow is the cumulative flow accumulated in each time period is the cumulative flow.

Flow meters with a pulse output essentially use pulses per litre to measure the amount of fluid being dispensed. And then send a signal to an external piece of equipment to tell them this information.

A fuel pulse meter for example is often connected to a remote display or a fuel management system.

Our range of fuel pulse meters include models suitable for different fluids and are compatible with pumps with differing flow rates. Ensure that when selecting your meter, its flow range meets your pump’s flow capabilities.

Of course, in addition to measuring Diesel Fuel flow meters. Other flow meters can also output pulses or 4-20mA signals.

For example, if you need to measure the waste water flow of a 2-inch pipe, then you can refer to: Magnetic Flow Meters Guides.

How much is a 2 inch water flow meter? Let’s find out.

Fuel Flow Meters for Diesel Engine Fuel Consumption

For generators, boats, trains to hydraulic packs applications. Diesel engines are becoming increasingly popular.

Fuel consumption and efficiency are generally not monitored in Diesel Engines. And the unit’s performance has to be gauged from the manufacturer’s test figures and often never checked again.

With increases in fuel prices, the possibility of theft from remote installations along with many other factors. So the monitoring the fuel consumption of diesel engines has become increasingly important with the transport industries in particular taking a lot more interest in their vehicles fuel consumption.

This chart approximates the fuel consumption of a diesel generator. Based on the size of the generator and the load at which the generator is operating at. Please note that this table is intended to be used as an estimate of how much fuel a generator uses during operation. And is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed.

Extended reading: Fuel Flow Meter for Boat-Selection & Application

Ddiesel engine fuel consumption chart

Generator Size (kW)2030406075100125135150175200230250300350400500600750100012501500175020002250
1/4 Load (gal/hr)0.61.31.61.82.42.63.13.33.64.14.75.35.76.87.98.91113.216.321.626.932.237.542.848.1
1/2 Load (gal/hr)0.91.82.32.93.44.155.45.96.87.78.89.511.313.114.918.52227.436.445.354.363.272.281.1
3/4 Load (gal/hr)1.32.43.23.84.65.87.17.68.49.71112.513.616.118.721.326.431.539.352.16577.890.7103.5116.4
Full Load (gal/hr)1.62.944.86.17.49.19.810.912.714.416.61821.525.128.635.742.853.471.188.8106.5124.2141.9159.6

Learn more about Diesel fuel tank level gauges & Indicators

Fuel flow meter aircraft

A fuel flowmeter for plane indicates an engine’s fuel use in real time. This can be useful to the pilot for ascertaining engine performance and for flight planning calculations.

The types of fuel flow meter used on an aircraft depends primarily on the powerplant being used and the associated fuel system. Not every plane or associated system uses the same kind of flow meter to get the job done.

In most cases, many flow meters perform tasks related to maintaining a single plane. Some of the more common flow meters in use include:

https://www.aircraftsystemstech.com/2017/06/fuel-system-indicators.html

Every flow meter must be properly maintained and calibrated. All flow meters become inaccurate over time through regular use. Regular re-calibrations and general standards to ensure proper operation.

Flow meters designed for the aviation industry are made of the highest quality materials and to specific industry standards. That way, everyone working in the industry and flying the skies can be in the safest environment possible at all times.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

Marine diesel fuel flow meter

  • How much fuel is consumed onboard a ship, is directly related to the performance. The better the performance, the lower the fuel consumption during operation. In this equation, accuracy is not negligible.
  • An offset of 1% in measurement on a vessel operating 200 days a year consuming an average of 100 tons a day equals an offset of 200 tons a year. Depending on the price of HFO or MGO used, this misread has the potential to range up to USD 100,000.
  • The Coriolis Mass Flow Meters used in our Fuel Consumption System has an accuracy better than 0,2% of nominal flow directly measured in mass. Whereas most volumetric flow meters are in the range 0,5% to 2,0%. And they rely on volumetric conversion which depends on the temperature to calculate a mass flow.
  • By installing one or more mass flow meters (depending on engine supply line layout and desired insight) fuel consumption can be monitored closely in real-time.
  • The main principle is to measure the flow of fuel before and after the engine and/or generators. When you compare the consumption data with measurements of actual speed and position (based on speed log and GPS signals). You are able to directly measure the fuel efficiency.
  • If you require more detailed readings, for example, one set of meters per consumer or one set for the ship’s entire consumption. Additional flow meters can be installed.

Read more about: Large-diameter Oval Gear-Marine Fuel Flow Meter

More Technical Supprots

Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

What is a fuel flow meter? Fuel flow meter is an instrument that can monitor fuel flow. Industrail Fuel is an important energy source. For example, diesel, marine fuel, gasoline, etc.

Industrail Fuel is an important energy source for production and manufacturing. For example, diesel, marine fuel, gasoline, etc. It is very necessary to accurately measure industrial fuel. Commonly used industrial fuel flow meters, such as turbine flow meters, gear flow meters, mass flow meters, ultrasonic flow meters, etc.

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If you are interested in fuel flow sensor, Sino-Instrument has over 100 flow meters related, so you can compare and shop! Try finding the one that is right for you by choosing the price range, applications, or specifications that meet your needs. You will find a high quality fuel flow sensor at an affordable price from Sino-Instrument.

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