The Myth of Ceramic Pressure Sensor

What is a ceramic pressure sensor?

Ceramic pressure sensors are sensor diaphragms made of ceramic alumina (Al2O3). Ceramic is a material with high elasticity, corrosion resistance, wear resistance, impact, and vibration resistance. Ceramic has good thermal stability characteristics. High-temperature sintering process for the thick film. The working temperature range of the ceramic pressure sensor is as high as -40~125℃. The high elasticity and creep resistance of ceramics. The ceramic pressure sensor has good long-term stability. Besides, the corrosion resistance of ceramics. It has advantages in the fields of refrigeration, chemical industry, and environmental protection.

The Myth of Ceramic Pressure Sensor

The Basic Structure of Ceramic Pressure Sensor

The ceramic pressure sensor is mainly composed of a ceramic ring, a ceramic diaphragm and a ceramic cover plate.
The ceramic diaphragm acts as a sensitive elastic body. It is made of 95% AL2O3 porcelain. It is required to be flat, uniform and dense. Its thickness and effective radius depend on the design range.

The porcelain ring is shaped by high-temperature firing using a hot die-casting process. High-temperature glass slurry is used between the ceramic diaphragm and the ceramic ring. It is fired together by thick film printing and thermal firing technology. It forms a cup-shaped elastic body with a fixed peripheral edge. That is, a non-creep rigid structure should be formed in the fixed support part of the ceramic periphery.

On the upper surface of the ceramic diaphragm, which is the bottom of the porcelain cup. The circuit of the sensor is made with thick film technology. The circular groove at the lower part of the ceramic cover creates a certain gap between the cover and the diaphragm. The limit can prevent the diaphragm from rupturing due to excessive bending when it is overloaded. Form the anti-overload protection of the sensor.

Extended reading: Common Pressure Sensor Applications

Featured SI-338 Ceramic Pressure Sensor

SI-338 Ceramic pressure sensor uses ceramic or diffused silicon core. All stainless steel package, small and beautiful appearance. Suitable for occasions with limited installation space. Wide range temperature compensation, high accuracy, small size, no adjustment, wide range coverage. Support OEM processing. Ceramic pressure transmitter is used in compressor, air conditioning and other pressure measurement.

Extended reading: What Is Flush Diaphragm Pressure Sensor?

Features of Ceramic Pressure Sensor

Ceramic is a recognized material with high elasticity, corrosion resistance, wear resistance, impact and vibration resistance. The thermal stability of ceramics and its thick film resistors can make its operating temperature range as high as -40 to 135°C. It also has high accuracy and high stability for measurement. Electrical insulation degree>2kV. Strong output signal. Good long-term stability.

Ceramic sensors with high characteristics and low prices will be the development direction of pressure sensors. In Europe and the United States, there is a trend to completely replace other types of sensors. In China, more and more users use ceramic sensors to replace diffused silicon pressure sensors.

  • Ceramic sensitive diaphragm with high overload capacity;
  • Zero point and full scale laser calibration;
  • Excellent anti-corrosion and anti-wear performance;
  • Anti-shock and anti-vibration;
  • High precision and high stability;
  • Wide operating temperature range;
  • Small size, easy to package;
  • Environmental friendly;

Extended reading: What is a pressure sensor?

Ceramic Pressure Sensor Working Principle

The corrosion-resistant ceramic pressure sensor has no liquid transmission. The pressure directly acts on the front surface of the ceramic diaphragm, causing the diaphragm to produce a small deformation.

The thick film resistor is printed on the back of the ceramic diaphragm. Connected to form a Wheatstone bridge (closed bridge).

Due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3 mV/V according to the pressure range. Etc. Compatible with strain gauge sensors.

Calibration by laser. The sensor has high temperature stability and time stability. The sensor comes with a temperature compensation of 0~70℃. It can be in direct contact with most media.

Extended Reading: Up to 800°C High Temperature Pressure Sensor

Ceramic Pressure Sensor Types

The base material of ceramic pressure sensor is Al2O3 ceramic. According to the principle of realization, it can be divided into capacitive pressure sensor and piezoresistive pressure sensor.

The ceramic substrate and diaphragm are plated with metal and used as electrodes. The two ceramic parts are connected together by a glass seal. Maintain a controllable gap. So that the two metal electrodes form a capacitor.

If pressure is applied. Then the gap between the substrate and the diaphragm will be changed. Thereby changing the capacitance of the sensing element. The pressure-related signal output is formed by the subsequent processing circuit.

Because the edge of the ceramic diaphragm is fixed on the ceramic base. Peripheral support. When the force is applied, the middle deformation becomes larger, and the edge becomes smaller. The capacitance produces nonlinearity and reduces sensitivity.

In order to reduce temperature effects and edge effects. In the design, a circular single electrode is set on the ceramic diaphragm as the common electrode. Two electrodes are arranged on the ceramic cover plate to equalize the area. It forms a coaxial ring-shaped dual-capacitance sensor.

Extended Reading: MEMS Pressure Sensors

The center is the measurement capacitance Cp. The edge ring is the reference capacitor Cr. The outside of Cr is the fixed side. The subsequent signal conditioning circuit deals with the voltage difference between the two capacitors. The change of Cp and Cr is converted into DC voltage output by using square wave excitation signal. The magnitude of the applied pressure is measured by the difference signal of the two output voltages.

The dual-capacitor structure greatly reduces the nonlinear error of the sensor system. At the same time, when the ambient temperature changes, the two capacitors experience the same temperature change. The temperature effect of temperature on them is consistent. This offsets the measurement error caused by temperature changes. Realize the function of temperature self-compensation.

Extended reading: Featured Diaphragm Seal Pressure Transmitters

The piezoresistive pressure sensor is mainly composed of a ceramic ring, a ceramic diaphragm and a ceramic cover plate.

The ceramic diaphragm acts as a sensitive elastic body. On it, a thick film process technology is used to form a Wheatstone bridge as the sensor circuit. Due to the piezoresistive (deformation) effect of the resistor, a voltage signal is generated.

The thick film resistor is printed on the back of the ceramic diaphragm. Connected as a Wheatstone bridge (closed bridge).

When the pressure is zero. The bridge is in a balanced state, and the output voltage is zero.

When pressure is applied to the bridge. The deformation of the diaphragm causes the resistance of the four resistors of the bridge to change. The bridge is in an unbalanced state. Generate a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage.

Due to the piezoresistive (deformation) effect of the resistor, a voltage signal is generated.

The standard signal is calibrated to 2.0 / 3.0 / 3.3 mV/V etc. according to the pressure range. Compatible with strain gauge sensors.

Calibration by laser. The sensor has high temperature stability and time stability. The sensor comes with a temperature compensation of 0~70℃. And can be in direct contact with most media.

Extended reading: Silicon Pressure Sensor

Frequently
Asked
Questions

There are many types of pressure sensors. Such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors, etc.

Extended reading: wireless pressure transmitter working principle

Currently, the most widely used pressure sensors include:

  • Diffused silicon piezoresistive pressure sensor,
  • Ceramic piezoresistive pressure sensor,
  • Sputtering thin film pressure sensor,
  • Capacitive pressure sensor,
  • Sapphire pressure sensor with high temperature resistance.
  • But the most widely used is the piezoresistive pressure sensor, which has a very low price, high accuracy and good linearity.

Extended Reading: Electronic Pressure Switch for Air Compressor

The piezoresistive pressure sensor is constructed using the piezoresistive effect of single crystal silicon. A single crystal silicon wafer is used as an elastic element, and an integrated circuit process is used on the single crystal silicon membrane. A group of equivalent resistors are diffused in a specific direction of the single crystal silicon, and the resistors are connected into a bridge circuit. The single crystal silicon wafer is placed on Sensor cavity. When the pressure changes, the single crystal silicon produces strain, so that the strain resistance directly diffused thereon changes proportional to the measured pressure. Then the bridge circuit obtains the corresponding voltage output signal.

Extended reading: How do you calibrate a smart pressure transmitter?

Differential pressure sensor, as the name suggests, is a kind of sensor. But it is used to transmit pressure difference. So it is called differential pressure sensor.

Generally speaking, its function is mainly to measure the difference between two different pressures. And it is displayed by the sensor. The differential pressure sensor is often used to measure the pressure of the two end points before and after a certain part of a device Difference.

Extended reading: Miniature Pressure Switch

Extended Reading: Selection of pressure transmitter

Ceramic Pressure Sensor Cost

Ceramic Pressure Sensor has low cost. The price of the ceramic pressure transmitter that people often choose is basically between USD15~35. Save a lot of costs for customers.

Extended reading: extrusion melt pressure transducer

Sino-Inst offers Ceramic Pressure Sensors. A wide variety of Ceramic Pressure Sensors options are available to you. Such as free samples, paid samples. 

Sino-Inst is a globally recognized manufacturer of Ceramic Pressure Sensors, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. 

Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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Mass Flow Rate vs Volumetric Flow Rate

Mass flow rate and Volumetric flow rate is what we must use in flow measurement and control. So what is mass flow and what is volumetric flow? How to switch between them? In this post, we compare the concept of volume flow and mass flow and the conversion between the two.

Commonly used flow meters, such as orifice plates. Turbine flowmeter. Vortex flowmeter. Electromagnetic Flowmeter. Rotameter. The flow measurement value of ultrasonic flowmeter and oval gear flowmeter is the volume flow of fluid. Coriolis mass flow meters and thermal gas mass flow meters measure mass flow.

Sino-Inst offers a variety of volume flow and mass flow meters for flow measurement. If you have any questions, please contact our sales engineers.

What is Flow Rate?

Flow rate refers to the ratio of the amount of fluid flowing through the cross-section of the pipe to the time it takes for that amount to pass through the cross-section. Flow is divided into volume flow and mass flow.

What is volume flow Rate?

The volume flow rate is the flow rate expressed by the volume of the fluid quantity.
The volume flow is expressed by the formula: qv=V/t=u×A.

In the formula:

  • qv is the volume flow, m3/s.
  • V is the unit flow volume, m3.
  • t is the unit time, s.
  • u is the average flow velocity in the pipe, m/s.
  • A is the cross-sectional area of ​​the pipeline, m2.

Among the commonly used flow meters, such as orifice plates, turbine flow meters, vortex flow meters, electromagnetic flowmeters, rotameters, ultrasonic flow meters, and oval gear flow meters, the flow measurement value is the volume flow of the fluid.

If you need, you can learn more about Flow Rate And Pressure Relationship.

Featured Volume Flow Meters

Volume flow unit converter

UnitL/minm3/hf t 3/hUkgal/minUsgal/minUS  bbl/d
L/min10.062.11890.219970.02641889.057
M3/h16.667135.3143.6674.403151
Ft3/h0.47190.02831710.10380.12474.2746
Ukgal/min4.5640.027279.632511.2003241.1
Usgal/min3.7850.22738.02080.8326134.28
US
bbl/d
0.11040.006240.233940.024280.029171

What is mass flow Rate?

Mass flow rate refers to the flow rate of fluid quantity expressed by mass.
The mass flow rate can be expressed by the formula: qm=m/t=ρ×u×A.

In the formula,:

  • qm is the mass flow rate, kg/s.
  • m is the unit fluid mass, kg.
  • ρ is the fluid density, kg/m3.
  • t is the unit time, s.
  • u is the average flow velocity in the pipe, m/s.
  • A is the cross-sectional area of ​​the pipeline, m2.

Extended reading: Gas mass flow controller working principle

Featured Mass Flow Meters

mass flow rate units converter

1 kilogram per second (kg/s)

=3600.0000 kilograms per hour (kg/h)

=3.6000 tons per hour (t/h)

=86.4000 tons per day (t/d)

=2.8800×104 tons per year (t/a)

= 2.2046 pounds per second (lb/s)

= 7936.6414 pounds per hour (lb/h)

= 1.9048 x 105 pounds per day (lb/d)

Unit(t/h)(kg/h)(kg/min)(kg/s)(UKton/h)(lb/h)(lb/min)(lb/s)
(t/h)110316.66670.2777780.9842072204.6236.74370.61239
(kg/h)10-310.01666672.77778×10-49.84207×10-42.204620.03674376.12395×10-4
(kg/min)0.066010.01666670.0590524132.2772.204620.0367437
(kg/s)3.636006013.543157936.63132.2772.20462
(UKton/h)1.016051016.0516.93420.2822361224037.33330.62222
(lb/h)4.53592×10-40.4535920.007559871.25998×10-44.46429×10-410.01666672.77778×10-4
(lb/min)0.027215527.21550.4535920.007559870.02678576010.016666
(lb/s)1.632931632.9327.21550.4535921.607143600601

Volumetric flow rate to Mass flow rate

The mass flow rate and volume flow rate relationship can be briefly summarized as follows:

  1. If the mass flow of the flow is known and needs to be converted into volume flow, the following formula can be used: qv=qm/ρ. In the formula, qv is volume flow, m3/s. qm is mass flow, kg/s. ρ is fluid Density, kg/m3.
  2. If the volume flow rate of the fluid is known, it needs to be converted into a mass flow rate, which can be done with the formula: qm=qv×ρ.

volumetric flow rate to mass flow rate calculator

Mass Flow & Density to Volume Flow CalculatorMass Flow Rate Unit ConverterVolume Flow Rate Converter
Volume Flow & Density to Mass Flow CalculatorVolumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

How to convert air volume flow to air mass flow?

The conversion factor between air volume flow rate and air volume flow rate is 1.29. That is, to convert the volume flow of air into the mass flow, multiply the coefficient by 1.29.

Solution: Let the mass of air passing in t hours be m kg, the volume be V cubic meters, and the known air density ρ = 1.29 kg/m3.

Then the volume flow rate of the air qv=V/t (cubic meters/hour), and the mass flow rate qm=m/t (kg/hour).

And because air quality = air density x air volume, m = ρV = 1.29V.

Then qm=m/t=ρV/t=ρqv=1.29qv.

That is, to convert the volume flow of air into a mass flow, multiply the coefficient by 1.29.

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


Density, Mass Flow, and Volumetric Flow Relationship

A description of the relationship between density, mass flow rate, and volumetric flow rate. The following video provides a good explanation.

Video source: https://www.youtube.com/watch?v=4KNfADc77XU

Frequently
Asked
Questions

If the volume flow rate of the fluid is known, it needs to be converted into mass flow rate, which can be carried out by the formula: qm=qv×ρ

Volume flowrate (Volume Flowrate) is the volume of fluid passing through the flow section per unit time, referred to as flow rate, expressed by Q.
Flow rate expressed in volume/time or volume/time. Such as: m³/h ,l/h.
Volume flow rate (Q) = average velocity (v) * pipe cross-sectional area (A)

The fluid pressure and flow rate in the pipeline are completely two concepts. For fluids with high pressure, the flow rate can be high or low.
Engineering pressure is the amount of force per unit area. The flow rate is the amount (weight or volume) of the fluid flowing through the pipe per unit time.
Here, there is another important parameter: flow rate. It is the average velocity of fluid flowing in the pipe. The unit is: the flow rate per unit area (internal section of the pipeline). That is: the flow rate multiplied by the pipe cross-sectional area equals the flow rate.
If the fluid is a gas (compressibility), the flow rate is constant, and the flow rate of a gas with high pressure is of course also large. If the size of the pipe is constant, the flow rate of the fluid with a large flow rate is of course also large; the pressure loss (i.e. pipeline resistance) is proportional to the square of the flow rate, that is, proportional to the square of the flow rate.

Read more : How to Calculate Pressure Drop in a Pipe?

If the fluid under a certain pressure is directly discharged to the atmosphere under certain conditions (the diameter of the pipe is the same), the fluid pressure can be converted into velocity energy, and the flow rate of the fluid with high pressure is correspondingly high, and of course, the flow rate is also large.

More mass or volume flow measurement solutions

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Sino-Inst is Manufacturer of Mass Flow Meters and Volumetric Flow Meters. We supply more than 50 kinds of Flow Meters. 40% mass flowmeters, and other types of Volumetric flowmeters.

Since the mass flowmeter has the ability to directly measure the mass flow of fluid beads, the measurement accuracy is high. It has a wide range of applications, low installation requirements, reliable operation of the instrument, and low maintenance rate. Mass flow meters have been widely used in flow measurement in petroleum, chemical, metallurgy, thermal, electric power, food and other fields.

Volumetric flowmeters are low cost and cover more measurement applications. It is also widely used in various industrial production control processes.

Sino-Inst’s Mass Flow Meters and Volumetric 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 flow sensor, level sensor, or other device, give us a call.

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

You may like: Explosion Proof Pressure Transmitter for Hazardous locations

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.

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Flow Pressure Transducers are measurements of fluid pressure within a pipeline. When fluid flows through a pipe, pressure acts on the pipe wall. The medium in the pipeline can be…

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High Accuracy Pressure Transducers are also called high precision pressure transducers or high accuracy pressure sensors. Sino-Inst manufactures various types of High Accuracy Pressure Transducers. From the perspective of accuracy,…

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.

Request a Quote

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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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Tank Level Gauges & Indicators

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Magnetic Level Gauge/Indicator

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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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Turbine type Flow Meter

Turbine type flow meter is a Volume flowmeter. Turbine flow meters use the mechanical energy of the liquid or gas to rotate a rotor in the flow stream. The rotational speed of the rotor is proportional to the velocity of the fluid. In multiple industries, Turbine meters are used to measure the velocity of a variety of liquids, gases and vapors.

Turbine flow meter is the most popular equipment to measure flow electronically. Offer a wide flow and application rangeability. Turbine Flow Meters are easy to maintain, durable and versatile.

Turbine Flow Meters

What is a turbine flow meter?

A turbine flowmeter is a flowmeter that uses a turbine for measurement. It first converts the flow rate to the speed of the turbine. And then converts the speed into an electrical signal that is proportional to the flow. Turbine flow meter is used to detect the instantaneous flow and the total accumulated flow. And its output signal is frequency, which is easy to digitize.

Turbine flow meter advantages and disadvantages

Turbine Meter Advantages

  • The cost is moderate.
  • Very good at clean, low viscosity fluids of moderate velocity and a steady rate.
  • Turndown is very good as it can read very low compared to the greatest flow.
  • They are reliable if put in a clean fluid especially if it has some lubricity.
  • AGA and API approved for custody transfers.
  • They do cause some pressure drop where that may be a factor such as gravity flows.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.
  • High accuracy. Among all flowmeters, it is the most accurate flowmeter.
  • No zero drift, good anti-interference ability.

Turbine Meter Disadvantages

  • Not reliable for steam.
  • Bearings wear out.
  • Requires constant backpressure to prevent cavitation.
  • Accuracy adversely affected by bubbles in liquids.
  • Turbine meters can be used with clean liquids and gases only (may need to install a strainer upstream to prevent damage from particulates).
  • Not applicable for measuring corrosive fluids.
  • May not function properly with high viscosity fluids where the flow profile is laminar.
  • Cannot maintain calibration characteristics for a long time.

Turbine flow meter principle

Turbine meters are simple to operate and maintain. Turbine type flow meter is a reliable, cost-effective method for accurate flow measurement. Turbine flow meters are designed to maximize throughout and minimize pressure drop. Turbine meters can maintain high flow rates over an extended flow range and offer pulse output linear to the flow rate. The turbine meters also minimize fluid measurement uncertainty. By delivering high-frequency pulse resolution to account for minute increments of the flow rate.

A turbine flow meter is constructed with rotor and blades. Turbine meters use the mechanical energy of the fluid to rotate the rotor in the flow stream. The turbine, installed in the fluid pipeline, is supported by bearings at both ends. When the fluid passes through the turbine, the fluid impacts the turbine blades and drives the turbine blades to rotate. The sensor of the turbine flowmeter measures the flow rate through the angular velocity of the turbine blades. The method used by the turbine flowmeter is that the angular velocity of the blade is proportional to the fluid velocity.

Turbine flow meter’s angular velocity is detected by a sensing coil mounted on the casing. Turbine blades cut magnetic field lines generated by permanent magnetic steel in the casing. Changes in the magnetic flux of the sensing coil. The sensing coil sends the detected periodic change signal of the magnetic flux to the amplifier of the measuring instrument. The amplifier amplifies and shapes the signal.At the same time, the pulse signal is sent to the frequency current conversion circuit. Convert the pulse signal into an analog current amount, which then indicates the instant Flow value.

Liquid Turbine Flow Meters

Extended reading: Turbine Flow Meter Specification

A flow transmitter processes the pulse signal to determine the flow of the fluid. Flow transmitter and sensing systems are available to sense flow in both the forward and reverse flow directions. 

Turbine flow meter Equation

In a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor.

The flow equation is:

Q = 3600 × f / k

In the formula:

f——pulse frequency [Hz];

k——meter coefficient [1 / m] of the sensor, given by the checklist. If [1 / L] is the unit

Q = 3.6 × f / kQ——the instantaneous flow of the fluid (in the working state) [m3 / h];

3600-conversion factor.

The instrument coefficient of each sensor is filled in the verification certificate by the manufacturer. The value of k is set in the matching display instrument, and the instantaneous flow and cumulative total can be displayed.

Extended reading: Quantitative control with turbine flowmeter

What is K factor in turbine flow meter?

The turbine meter measures volumetric flow, however the pulses produced vary depending on the meter. The variation is accounted for by a K-factor. The K-factor is the number of pulses per unit volume.

Simply stated a K-factor is a dividing factor. The term is usually encountered. When dealing with pulse signals although analog K-factors are sometimes used.

How do you calculate K factor for a turbine flow meter?

The frequency of the output pulse is proportional to the flow through the flowmeter, and its proportionality factor K is:

K = f / qv

Where:

f–the output pulse frequency of the turbine flowmeter;

qv–flow through the flowmeter.

This proportionality factor K is also called the meter factor of the turbine flowmeter.

Gas turbine flow meter

Gas Turbine Flow Meters applications

Gas Turbine Flow Meter, is the flange type turbine flow meter. Turbine flow meter is the most popular equipment to measure flow electronically. They offer a wide flow and application rangeability. 

Sino-Instrument’s GAS Turbine Flow Meter, is perfect choice for natural gas flow rate measurement. Turbine flow meters are suitable for gas and liquid measurement. They offer a wide flow and application rangeability. Turbine Flow Meters are easy to installation, maintain, durable and versatile.

Turbine water flow meter

Liquid Turbine Flow, is the turbine flow meter that suitable for liquid flow rate measurement. Like water flow, Diesel flow. Turbine flow meter is the most popular equipment to measure flow electronically. They offer a wide flow and application rangeability. Turbine Flow Meters are easy to maintain, durable and versatile.

Full bore turbine flow meters are suitable for hot and cold water applications. The impeller which is of modern design, rotates on stainless spindles mounted in the measuring chamber. The impeller is made of self-cleaning synthetic resin. The helix aligns with the pipe axis. The complete metering unit is easily removable from the meter body. And is designed to ensure high flow-rate with the smallest headloss. Versions for warm water up to 90°C and telemetering (complete with a pulse output) are also available.

Liquid Turbine Flow Meters

Read more Turbine Flow Meter Application Case: Demineralized Water.

Low flow turbine flow meter

The small Diameter (small flow) liquid turbine flow meter, is a precision flow measuring instrument,that can be used to measure the flow and total volume of liquids. The structure is explosion-proof and can show the total flow, instantaneous flow and percentage of flow fullness. It is widely used in measurement and control systems in petroleum, chemical, metallurgical, scientific research and other fields. Sensors equipped with sanitary fittings can be used in the pharmaceutical industry.

Turbine flow meter price

Sino-Inst is a Turbine flow meter manufacturer, China. Sino-Inst offers over 10 turbine flow meter products. A wide variety of turbine flow meter options are available to you, such as free samples, paid samples. The price of turbine flow meters are decided by flollowing factors:

  • Pipe diameter;
  • Flow range;
  • Measured medium;
  • Whether it is corrosive;
  • Whether explosion protection is required;
  • Whether it needs local display;
  • Connection method;
  • Measure pressure;
  • Measure temperature;
  • Signal output;
  • Accuracy requirements;
  • Material requirements;

For example, Model DN15 Turbine flow meter’s price is around USD 140.00/pc.

More about: Best Price Turbine Flow Meters From Reliable Manufacturer

Electromagnetic flow meter

A Magnetic flow meter, also called electromagnetic flow meter, mag flow meter, or magmeters. A magnetic flow meter is a volumetric flow meter that works with principle of magnetic technology. Magnetic flow meters do not have any moving parts. An electromagnetic flowmeter consists of two parts: Electrode (sensor) and Transmitter. Installation types of magmeters could be: Compact, remote, insertion.

Magnetic flow meter is ideal for wastewater applications or any dirty liquid which is conductive or water based. Magnetic flow meters are also ideal for applications where low-pressure drop and low maintenance required. A range of liner materials, electrode options, and line sizes accommodate a wide variety of process application.

Extended reading: Industrial Magmeters

How does an electromagnetic flow meter work?

Magnetic flow meters use a magnetic field to generate and channel liquid flow through a pipe.
A voltage signal is created, when a conductive liquid flows through the flowmeter’s magnetic field.
The faster the flow of the fluid, the greater the voltage signal generated.
Electrode sensors located on the flow tube walls pick up the voltage signal. And send it to the electronic transmitter, which processes the signal to determine liquid flow.

More about Magnetic flow meter.

What is Flow Transmitter working principle?

Flow Metering Principles

From the measurement principle, the flowmeter can be divided into Volumetric flowmeters and Mass flwo meters.

VOLUMETRIC FLOWMETERS:

  • Differential Head type
    • Orifice plates
    • Venturi meters
    • Annubar
  • Differential Area type (Rotameters)
  • Electromagnetic flowmeters
  • Ultrasonic flowmeters
  • Turbine flowmeters
  • Vortex flowmeters
  • Positive Displacement Meters

MASS FLOWMETERS:

For different working principle, We offer different types of flow meters, like:

How does a pulse flow meter work?

The frequency signal is converted into a digital signal for display. This is called a pulse flow meter. The pulse is the output signal of the flow meter. It is a pulse output. Now the standard output of most flow meters is 4-20MA, which can also be made into a pulse output.

Turbine flowmeters use the mechanical energy of the fluid to rotate a “pinwheel” (rotor) in the flow stream. Blades on the rotor are angled to transform energy from the flow stream into rotational energy. The rotor shaft spins on bearings. When the fluid moves faster, the rotor spins proportionally faster. Turbine flowmeters now constitute 7% of the world market.

Shaft rotation can be sensed mechanically or by detecting the movement of the blades. Blade movement is often detected magnetically, with each blade or embedded piece of metal generating a pulse. Turbine flowmeter sensors are typically located external to the flowing stream to avoid material of construction constraints that would result if wetted sensors were used. When the fluid moves faster, more pulses are generated. The transmitter processes the pulse signal to determine the flow of the fluid. Transmitters and sensing systems are available to sense flow in both the forward and reverse flow directions.

Where are flow meters used?

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

Sino-Instrument offers over 50 flow meter for flow measurement.

About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meter.

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

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

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Electronic Flow Meters

Electronic flow meters are industrial digital flow meters for fluid flow rate measurement. In more cases, people will default that Electronic flow meters are electromagnetic flowmeters.

Electronic flow meters types like Magnetic, Vortex, and Ultrasonic flow meters. Electronic flow meters are suitable for Industrial liquid, water, natural gas, petrol, fuel, air, and more fluid flow. Electronic flow meters convert the monitored fluid flow into electronic signals. Including pulse signal, 4-20mA standard signal, etc.

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

Sino-Inst, the manufacturer of Electronic flow meters. We will answer your various questions about Electronic flow meters.

What is electronic flow meter?

A flow meter is a device used to measure the volume or mass of a gas or liquid. Flow meters are referred to by many names, such as flow gauge, flow indicator, liquid meter, flow rate sensor, flow rate meter, etc. depending on the particular industry.

Electronic flow meters are industrial digital flow meters for fluid flow rate measurement. Electronic flowmeters types like Magnetic, Vortex, and Ultrasonic flow meters.

While magnetic, vortex, and ultrasonic–are neither exclusively nor exhaustively electronic in nature. They do represent a logical grouping of flow measurement technologies.

All electronic flow meters have no moving parts, are non-intrusive, and are made by electronics technology.

Magnetic flowmeters are the most directly electrical in nature, deriving their first principles of operation from Faraday’s law. Vortex meters depend on piezoelectric sensors to detect vortices shed from a stationary shedder bar. And today’s ultrasonic flowmeters owe their successful application to sophisticated digital signal processing.

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

Featured Electronic Flow Meters

Electronic flow meter working principle

Simply put, the working principle of Electronic Flow Meters is to convert the flow rate of the measured fluid into an electronic signal through the flow sensor component. And can carry out flow rate display and signal output. For example, display instantaneous flow rate, cumulative flow, etc.

As you can see. There are many types of Electronic Flow Meters. Therefore, their accurate measurement principles are different.

Magnetic flow meters use a magnetic field to generate and channel liquid flow through a pipe.

A voltage signal is created, when a conductive liquid flows through the flowmeter’s magnetic field.

The faster the flow of the fluid, the greater the voltage signal generated.

Electrode sensors located on the flow tube walls pick up the voltage signal, and send it to the electronic transmitter, which processes the signal to determine liquid flow.

Let see the video about:

How to Measure Flow with Magnets – (Magnetic Flow Meters)

Video source: https://youtu.be/TR0baWuB6v4

Faraday’s Law

The operation of a magnetic flow meter or mag meter is based upon Faraday’s Law, which states that the voltage is induced across any conductor. As it moves at right angles through a magnetic field, is proportional to the velocity of that conductor.

Faraday’s Formula

E =V x B x D

E = The voltage generated in a conductor

V = The velocity of the conductor

B = The magnetic field strength

D = The length of the conductor

To apply this principle to flow measurement with a magnetic flow meter, it is necessary first to state that the fluid being measured, must be electrically conductive for the Faraday principle to apply.

As applied to the design of magnetic flow meters, Faraday’s Law indicates that signal voltage (E), is dependent on the average liquid velocity (V) the magnetic field strength (B). And the length of the conductor (D) (which in this instance is the distance between the electrodes).

In the case of wafer-style magnetic flow meters, a magnetic field is established throughout the entire cross-section of the flow tube.

If this magnetic field is considered as the measuring element of the magnetic flow meter, it can be seen that the measuring element is exposed to the hydraulic conditions, throughout the entire cross-section of the flow meter.

With insertion-style flow meters, the magnetic field radiates outward from the inserted probe.

Extended reading: Industrial Magmeters

Advantages of using Electromagnetic Flow Meters.

  • High precision and stability
  • Self-check
  • Two-way measurement
  • No pressure loss
  • No moving parts
  • May be for sanitary purposes
  • Large size available
  • Dirty liquid and mixed fructose are ok

Disadvantages of using Magnetic Flow Meters

  • Can not be used to measure gas, steam and liquids containing a lot of gas;
  • Cannot be used to measure liquid media with very low conductivity. The electromagnetic flowmeter cannot measure petroleum products or organic solvents and other media;
  • Cannot be used to measure high temperature media. At present, it is restricted by the lining material and electrical insulation material of the measuring tube of the electromagnetic flowmeter for general industry;
  • The electromagnetic flowmeter is easily affected by external electromagnetic interference.

Extended Reading: Petroleum Flow Meter

A vortex flow meter is a flow measurement device best suited for flow measurements, where the introduction of moving parts presents problems.

They are available in industrial grade, brass, or all-plastic construction. Sensitivity to variations in the process conditions is low, and no moving parts have relatively low wear compared to other types of flow meters.

Vortex flowmeters operate under the vortex shedding principle, where oscillating vortexes occur when a fluid such as water flow past a bluff (as opposed to a streamlined) body.

The frequency that the vortexes are shed depends on the size and shape of the body. It is ideal for applications where low maintenance costs are important.

Industrial size vortex meters are custom built and require appropriate sizing for specific applications.

The Vortex Shedding flow meter detects the vortices, that are created by a process medium going past a bluff body.

The frequency of these vortices can be equated to flow velocity, which, in turn, is used to calculate the volumetric flow rate.

The integral temperature sensor is used in saturated steam service, to determine the operating conditions and specific volume of the steam being measured.

The steam table incorporated into the electronics then calculates the flow of energy of the stream flowing through the meter.

The optional pressure sensor can be used for similar calculations, for gasses and superheated steam. Intelligent Signal Processing (ISP) provides stable readings, free of external influences.

Why Generally Choose 4-20ma Output?

Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe.

At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe, and its reflections from the fluid are the same.

Under flowing conditions, the frequency of the reflected wave is different, due to the Doppler effect.

When the fluid moves faster, the frequency shift increases linearly. The transmitter processes signals from the transmitted wave, and its reflections to determine the flow rate.

Generally, an ultrasonic flow meter is a device, that uses ultrasound to measure the velocity of liquid flow. That helps in determining the volume of liquid flow also.

The ultrasonic flow meters are made using ultrasonic transducers, which are clamped to the external surface of a pipe, to generate the ultrasonic pulses through the pipe.

When the liquid flows inside the pipe, it creates the time difference in the pulses, and these are examined to calculate the accurate flow velocity of the liquid.

There are many advantages of using the ULTRASONIC flow meters which include:

  • The electronics in the ultrasonic flow meter includes ultrasonic flowmeter detector which compensates and adapts to the changes in the profile of the flow, type of the liquid and material of the pipe.
  • A portable ultrasonic flow meter converter can be used as a direct method to determine the flow rates effectively when compared to the other flow systems.
  • Ultrasonic flow meter converter is inexpensive to use and maintain when compared to the other mechanical flow meters as they are no moving parts in these flow meters.
  • Their design is highly sophisticated and they do not obstruct the liquid flow, so they can be used for sanitary, corrosive and abrasive liquids.

These are the advantages of the ultrasonic flow meters and there are many disadvantages of the Ultrasonic flow meter which include:

  • The main disadvantage of the ultrasonic flow meter is the cost. The cost of the flow meter is very high when compared to the other types of mechanical flow meters.
  • The ultrasonic flow meters are sophisticated when compared to the mechanical flow meters, so it needs experts to repair and maintain the flow meters.

These are the advantages and disadvantages of ultrasonic flow meters.

Fuel flow meters, also known as turbine flow meters, are the main types of speed flow meters. A freely rotatable impeller is installed in the fluid-flowing pipe. When the fluid passes, its motion can make the impeller rotate. The larger the fluid flow rate, the larger the kinetic energy, and the higher the impeller speed.

The fluid flow can be determined by measuring the number of revolutions or the number of revolutions of the impeller.

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

Perhaps you are not clear about the principle of Electronic Flow Meters. Don’t want to know more about it. Just want to find the applicable Electronic Flow Meters. Then you can start from your measuring medium.

Electronic flow meter for water

A Digital Water flow meter is a flow meter that can display the water flow rate, and have the output for the flow rate. Like 4-20mA output, HART, RS 485, and so on. Digital Water Flow Meter is also called Electronic Water Flow Meter. Digital Water Flow Meter is widely used in industrial water and household water measurement. Most of the Sino-Inst flow meters are digital water flow meters. Like the electromagnetic flowmeter, Portable ultrasonic flow meter, Turbine flow meter…..

Read more Digital Water Flow Meters

Electronic flow meter for air

Digital gas flow meters are flow meters used to monitor the gas flow rate or mass. Digital gas flow meters are designed to measure different types of gases. Like Air, N2, O2, CO2, and more.

Digital gas flow meters can measure the flow of a wide variety of gases. According to measurement principles, there can be positive displacement gas flow meters, velocity gas flow meters, and mass gas flow meters. How to choose the right Digital gas flow meters? We will discuss in detail next.

Read more Digital gas flow meters for Sale

Electronic flow meter for oil

Industrial oil flow meters measure the volume or mass of oil. Can realize the mutual conversion of volume and mass.

The main industrial oils are hydraulic oil. Gear Oil. Turbine oil. Compressor oil. Refrigeration oil. Transformer oil. Cylinder oil, heat treatment oil, heat transfer oil, etc. Of course, edible oil can also be produced in the industry. In addition, there are greases with lubricating oil as base oil and thickening agent.

Therefore, whether it is a company that uses, trades, or produces oil, it needs to accurately measure the oil flow.

There are many common oil flow meters, such as turbine flow meters, positive displacement flow meters, gear flow meters, mass flow meters, etc.

Then, we need to choose a suitable flow meter that meets the measurement and budget according to different working conditions.

Read more Industrial Oil Flow Meters

What are the different types of flow meters?

Flowmeter types: Generally speaking, we will classify flow meters according to their working principles.

Flow Metering Principals

  • Differential Pressure Flowmeters
  • Velocity Flowmeters
  • Positive Displacement Flowmeters
  • Mass Flowmeters
  • For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters and more

For different working principles, We offer different types of flow meters, like:

  • Differential Pressure Flow Meters
  • Orifice Plate
  • Venturi Tube
  • Flow Nozzles
  • The Sonic Nozzle – Critical (Choked) Flow Nozzle
  • Calorimetric Flowmeter
  • Ultrasonic Doppler Flowmeter
  • Positive Displacement Flowmeter
  • Variable Area Flowmeter or Rotameter
  • Velocity Flowmeters
  • Pitot Tubes
  • Electromagnetic Flowmeter
  • Turbine Flowmeter
  • Vortex Flow Meter
  • Thermal Flowmeter
  • Coriolis Flowmeter
  • Mass Flowmeters
  • Open Channel Flowmeters

Extended reading: Gas Rotameter Tips

How to choose your flowmeters?

Important factors when selecting flow metering devices are:

  • Measured medium
  • Accuracy
  • Cost
  • Flow rate range
  • Pperating requirements
  • Maintenance
  • Lifetime
  • Lead time

These factors are more or less related to each other. For example – the cost of flow meters increases with accuracy and lifetime quality. Read more about: What Is GPM In Flow Meter?

More about Electronic Flow Measurement Technology

Sino-Inst offers over 50 Electronic flow meters for flow measurement. About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meters.

A wide variety of Electronic flow meters options are available to you, such as free samples, paid samples. Sino-Inst is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

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In line Flow Meters

What is an inline flow meter?

In line flow meter is a flow meter with the function of displaying flow rate on-site. The sensor of the flow meter is installed on the fluid pipe. Digital display or pointer shows the flow rate on the spot.

In-line flowmeters could be digital and mechanical flow meters. Common in-line flowmeters include turbine flowmeters, electromagnetic flowmeters, and ultrasonic flowmeters. With stainless steel material, analog, and 4-20mA output, in-line flow meters can measure and control inline flow.

Features of In-line Flow Meters

  • Local LCD display flow rate.
  • Signal output: analog, 4-20mA, pulse, and so on.
  • Liquid, Gas pipe flow measurement.
  • Special materials can be selected depending on the working conditions.
    Such as PTFE
  • Remote type is available.

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

After understanding what an Inline flow meter is, you may want to know which flow meter is the most suitable?

Choose the most suitable Inline flow meter

Different measurement situations require different inline flowmeters.

Simply put, we can consider the following aspects:

  • Installation form
  • Fluid medium
  • Measuring principle
  • Application

In line flow meter

In line flow meter is currently the mainstream measuring instrument in flow measurement.

In line flow meter is an in-situ display flow meter, also called integrated flow meter. The display head and sensor are integrated.

At present, all integrated flow meters belong to the In line flow meter. They all have in-situ display function. For example, the split-type flow meter does not have the in-situ display function, and its meter and sensor are connected by conduction.

What are the advantages of in line flow meter in the flow measurement process?

In some measurements with a control system, the advantage of In line flow meter is not great. Because the flow can be monitored through the PLC system.

In working conditions without a PLC system, In line flow meter can show its advantages. It can display cumulative flow and instantaneous flow online.

Remote flowmeter

Remote flowmeter is also called split flowmeter. Compared with the online flowmeter, the remote flowmeter means that the sensor and the display are installed separately.

For example, the flow sensor is installed in the underground water pipe, but for the convenience of viewing the data, the display is installed on the ground. The sensor and the display can be connected via a signal cable.

Extended reading: Totalizing flow meter water

Insertion flow meter

What is an insertion flow meter? An insertion flow meter is a flow meter installed in insertion mode. Make a small hole in the pipe under test, and then insert the probe part of the flowmeter into the pipe. easy installation. It is suitable for measuring the flow of large-diameter pipelines.

The insertion flow meter that has been promoted and used has various forms. According to the working principle of the insertion flow meter detection head, it can be divided into insertion turbine, insertion vortex, insertion electromagnetic, uniform velocity tube and thermal flow meter, etc.

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Clamp-on flow meter

Clamp-on flow meter only needs to paste the external clamp sensor on the surface of the pipe to complete the flow measurement of various liquids.

Currently, the Clamp-on flow meter is only an ultrasonic flow sensor. It does not need to cut off the pipe and flow, the installation is convenient and quick, and it truly realizes the lossless installation.

Extended Reading: Inline Ultrasonic Flow Meter

Inline water flow meter

Commonly used inline flow meters to measure water flow include electromagnetic, ultrasonic, turbine, etc.

Digital water flow meters|Water flow meter types

In line fuel flow meter

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

Inline oil flow meter

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.

Inline gas flow meter

Digital gas flow meters are flow meters used to monitor the gas flow rate or mass. Digital gas flow meters are designed to measure different types of gases. Like Air, N2, O2, CO2, and more.

In line flow meter for compressed air

The compressed air flow meter is an upgraded and improved gas vortex flow meter. The Karman vortex airflow sensor is researched and produced according to the Karman vortex principle.

In line Magnetic Flow Meters

Sino-Inst is one of the reliable Magnetic flow meter manufacturers and suppliers in China. Magnetic flow meters apply for wastewater flow rate measurement.

Sino-Inst can offer stainless steel magnetic flow meters, both the Pipeline and plug-in style. Of course, Sino-Inst can offer you with the mass flow meters and other flow meters. Read More 

In line Ultrasonic Flow Meters

Ultrasonic flow meters, using the ultrasonic principle, measure the velocity of flow. We can use a different type of ultrasonic flow meters, like Portable ultrasonic flow meter, Handheld ultrasonic flow meter, Clamp-on Ultrasonic Gas Flow Meter. For airflow, natural gas, Read More

Extended reading: Flow Measurement of Nitrogen

In line Turbine Flow Meters

Turbine flow meters are flow sensors work for the inline liquids. Turbine flow meters are cost-effective and offer reliable, measurement with minimal flow meter maintenance required. Turbine flow meters measure the velocity of liquids, gases, and vapors in pipes, such Read More

Inline flow meters are mainly used for industrial pipeline fluid measurement. It can also be used for residential water pipes.

Residential inline water flow meter

Ultrasonic water meter is a new small residential water meter. Residential ultrasonic water meters are equipped with line water meters, and wireless water meters can be customized.

T3-1-2-H residential ultrasonic water meter adopts ultrasonic time difference measurement technology. A highly integrated, developed according to ISO4064-1:2005, GB/T778.1-2007, and other standards. A new generation of fully digital water meters with the advantages of high turndown ratio, ultra-low starting flow, and rich communication methods. IP68 protection level.

Industrial Inline flow meters have a wide range of applications. Need to select the appropriate type according to the measurement medium.

For example, in the food industry, hygienic electromagnetic flowmeters can be used to measure beer and milk. Or sanitary turbine flowmeter.

In the wastewater treatment industry, for example, electromagnetic flowmeters can be used to measure corrosive wastewater.

Read More about: Hot Water Flow Meters

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Inline Flow Meters can also be used with paperless recorders.

Related inline Flow Measurement Solutions

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Featured Inline Air Flow Meters Inline air flow meter units conversion Inline air flow meter cfm CFM is a common…

Cryogenic Flow Meters for Sale

Cryogenic Flow Meters for Highly Accurate and Reliable Cryogenic Fluids Flow Measurement. Sino-Inst offers a variety of  Cryogenic Flow Meters…

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

Frequently
Asked
Questions

If you let me answer this question. I would like to divide flow meters into two categories: mass flow meters and volumetric flow meters.

Of course, it can also be divided according to the measurement medium. There are two types of flow meters for measuring gas and measuring liquid.

Perhaps, we can also divide into closed pipeline measurement and open channel measurement according to the situation of the pipeline.

Finally, we may also be able to divide into contact and non-contact measurements according to the contact situation of the medium.

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

Extended Reading: Petroleum Flow Meter

There are differences in the allowable error of the measurement accuracy of the commonly used flowmeters, as follows.

  • Mass flow meter 0.05%;
  • Positive displacement flowmeter 0.25~0.5;
  • Electromagnetic flowmeter 0.25~1.0;
  • Turbine flowmeter 0.15~0.5;
  • Vortex flowmeter 0.15;
  • Ultrasonic flowmeter 0.10 (multi-channel is better than 0.5);
  • Orifice plate, micro cone, uniform velocity tube flowmeter 1 to 1.5, nozzle 0.10.

Relatively speaking, mass flow meters have the highest accuracy.

Both the accuracy and error of a flowmeter characterize the ability of a measuring instrument to approximate the actual true value of the measurement results. The higher the accuracy of the instrument, the closer the measured value is to the actual true value. The higher the accuracy, the smaller the error.

Many people feel that the flow meter (flow meter) is the same as the water meter to measure water, but it has the essence but different. However, a water meter is a type of flow meter (flow meter). Let’s talk about the difference between the two of them.

The flow meter (flow meter) can measure the instantaneous flow, and can understand the usage of each site. The water meter mainly has the accumulation function, and the instantaneous flow Q cannot be seen.

A water meter is also a type of flowmeter. It is a volumetric measurement with an accumulation function. The household water meter is a small flow measurement flow meter. It is not resistant to high pressure and high temperature, and cannot output linear signals. Unable to participate in the automation control of modern industry. Basically only metering water, certainly not for metering gas. Some liquid media also cannot be applied.

To put it simply, water meters are generally only used to measure water and have a wide range. Flow meters can measure liquids, gases, vapors, or two-phase.

The installation positions of different flowmeters have different requirements for straight pipe sections.

Liquid flow meters are generally better installed at low places. Because this can make the part of the liquid passing through the flow meter reach the state of full pipe.

Gas flow meters are generally installed high in the pipeline.

And almost all flow meters require a certain length of straight pipe. Different flow meters require different straight pipe lengths.

If there is anything you want to know, please contact us.

The general measurement is to use an electromagnetic flowmeter.

Magnetic flowmeters use the principle of Faraday’s Law of Electromagnetic Induction to measure the flow rate of liquid in a pipe. In the magnetic flowmeter pipe parts, a magnetic field is generated and channeled into the liquid flowing through the pipe.

As fluid flows through the magnetic field, conductive particles in the fluid create changes. This variation is used to measure and calculate the velocity of water flow through the pipe. When the fluid moves faster, more voltage is generated. The electronic transmitter processes the voltage signal to determine the liquid flow.

Read more about Digital Water Flow Meters

At present, the flowmeter products used for natural gas flow measurement roughly include: gas waist wheel flowmeter, gas turbine flowmeter, precession vortex flowmeter, thermal mass flowmeter, vortex flowmeter, ultrasonic flowmeter and orifice flowmeter Wait. Let’s make a simple comparison on the use of these flow meters.

Read more about: Natural Gas Flow Meter Types

Extended reading: Cryogenic Flow Meters | Liquid Nitrogen-Liquid Oxygen

Sino-Inst offers broad flow control and measurement portfolios in the industry. Sino-Instrument provides technology to measure and control whatever moves through a pipe or pipeline. Including water, air, steam, oil, other liquids and gases.

Customers can rely on Sino-Inst for application specific solutions, that deliver accurate, timely and dependable flow data and control essential,for product quality, cost control, safer operations, and regulatory compliance.

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What is a flow meter?

What is a flow meter?

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.

A flow meter also called a flow sensor, is a device or an instrument used to measure the linear, nonlinear, mass, or volumetric flow rate of a liquid or a gas.

Here, let’s take a closer look at what is a flow meter.

You may like the wikipedia: Flow Measurement.

If you need to know the flow rate in you pipe, or river, that when you need a flow meter. So, flow meter is the instrument that can finish the flow measurement.

Flowmeters consist of a primary device, transducer, and transmitter. The transducer senses the fluid that passes through the primary device.

The transmitter produces a usable flow signal from the raw transducer signal. These components are often combined, so the actual flow meter may be one or more physical devices.

Different types of flow meters are available for different applications, and depending upon the requirement, a careful selection of flow meters is made.

For e.g., we prefer vortex flow meters flow steam flow measuremnet. And we like the ultrasonic flow meters for non-contact pipe flow measuremnt.

Turbine type flow meter cannot be used for measuring the flow in an unclear liquid (wastewater or corrosive liquids).

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.

Understanding the relationship between Flow Rate and Pressure may help you calculate mass or volume flow.

You may like: Industrial flow meters

What are the types of flow meter? You may always hear words like: electromagnetic, vortex shedding, Coriolis, Ultrasonic, Venturi…. If you want to make better choice for your flow measurement, you may need to know more about the flow meter types. Flowmeters are used to measure the flow in a piping system. Let us see the types of flow meters by their different working principle.

Flow Metering Principles

From the measurement principle, the flowmeter can be divided into Volumetric flowmeters and Mass flwo meters.

VOLUMETRIC FLOWMETERS:

  • Differential Head type
    • Orifice plates
    • Venturi meters
    • Annubar
  • Differential Area type (Rotameters)
  • Electromagnetic flowmeters
  • Ultrasonic flowmeters
  • Turbine flowmeters
  • Vortex flowmeters
  • Positive Displacement Meters

MASS FLOWMETERS:

For different working principle, We offer different types of flow meters, like:

Extended reading: Gas Rotameter Tips

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.

Extended Reading: Rotameter vs Flow meter

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

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Mass flow rate vs Volumetric flow rate is what we must use in flow measurement and control. In this post, we compare the concept of volume flow and mass flow and the conversion between the two.

Commonly used flow meters, such as orifice plates. Turbine flowmeter. Vortex flowmeter. Electromagnetic Flowmeter. Rotameter. The flow measurement value of the ultrasonic flowmeter and oval gear flowmeter is the volume flow of fluid. Coriolis mass flow meters and thermal gas mass flow meters measure mass flow.

Read more Mass Flow Rate vs Volumetric Flow Rate

When measuring flow, the temperature of the medium and the pressure of the pipe have a great influence on the measurement.

Different flow meters have for you the pressure and temperature tolerance range. More than the rated pressure and temperature range, it will affect the measurement accuracy of the flowmeter. Or even damage the flowmeter.

Therefore, when choosing a flowmeter, be sure to clarify the measurement of temperature and pressure.

Guess you like: What is Reynolds number?

How to select the right flow meter for your application?

There are no “universal” flow meters which are suitable for all applications.

Selecting the proper technology for your application requires, writing a flow specification which covers the use of the meter.

There are usually trade-offs with each meter type, so knowing the critical specifications will be important.

There are some question that need to be answered before choosing a Flow Sensor.

  1. What is the fluid being measured?
  2. Do you require rate measurement and/or totalization?
  3. If the liquid is not water, what viscosity is the liquid?
  4. Do you require a local display on the flow meter or do you need an electronic signal output?
  5. What is the minimum and maximum flowrate?
  6. What is the minimum and maximum process pressure?
  7. What is the minimum and maximum process temperature?
  8. Is the fluid chemically compatible with the flowmeter-wetted parts?
  9. If this is a process application, what is the size of the pipe?

Read more General-purpose Flow Totalizer for Data collection and calculation

Which flowmeter do you need? Choose your flowmeters below

Magnetic Flow Meters

Magnetic flow meter is also called electromagnetic flow meter, mag flow meter or magmeter. Suitable for the measurement of conductive liquids.

Turbine Flow Meters

Turbine flow meters are velocity flow meters, also called impeller flow meters. Used to measure the instantaneous flow and cumulative flow of liquids and gases.

Vortex Flow Meters

Vortex flow meter, also called Vortex shedding flow meter. Vortex Flow Meter is suitable for flow measurement of steam and various liquids and gases.

Precession Vortex Gas Flowmeter

Precession vortex flowmeter is a new type of gas flowmeter. It can be used for the measurement of natural gas, propane, air, nitrogen and other gases.

Ultrasonic Flow Meters

The ultrasonic flow meter measures the liquid flow rate quickly and effectively. There are two types of ultrasonic flowmeter technology: Doppler frequency shift and transit time.

Ultrasonic Gas Flow Meters

Ultrasonic Gas Flow Meter uses the principle of measuring the transit time of ultrasonic waves in the pipeline. Ultrasonic Gas Flow Meter is an ideal choice for various gas measurements.

Differential Pressure Flow Meters

Differential Pressure Flow Meter is also called DP flow meter. Differential pressure flow meters use the principle of differential pressure to measure the flow of liquid, gas and steam.

Volumetric Flow Meters

Volumetric Flow Meter, as a mechanical flow meter, is also called Positive displacement flowmeter. It can measure the volume flow of high viscosity and corrosive fluids.

All flow meters can work with the AMS TREX, HERE !

You may like:

Mechanical Flow Meters

Selection Guide What is a mechanical flow meter? Mechanical flow meters are a type of flow…

Sino-Inst offer over 20 flow meters, with Best Price.

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

About 13% of these are magnetic flow meter, 14% are Insertion Magnetic Flow Meter, 25% are Venturi flow meter,

13% are Handheld ultrasonic flow meter, and others are Liquid Turbine Flow Meters.

Sino-Inst is wastewater flow meter suppliers, located in China.

Wastewater flow meter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitter respectively.

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

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Ultrasonic flow measurement


Ultrasonic Flow Measurement, Industrial Inline Flow Measurement.

Ultrasonic flow meters, using the ultrasonic principle, measure the velocity of flow.

We can use a different type of ultrasonic flow meters, like: Portable ultrasonic flow meter, Handheld ultrasonic flow meter, Clamp-on Ultrasonic Gas Flow Meter.

For airflow, natural gas, water, velocity measurement. There are two types of ultrasonic flow meter technologies: Doppler shift and transit-time. Transit-time measures the time differential between signals sent upstream and downstream.

The differential is directly proportional to the velocity of the water.

Transit-time meters are best used for measuring the flow of clean liquids and, as a result, are the most popular type of ultrasonic meter. 

Doppler shift measures the difference in frequency of the sound wave, reflected off gas bubbles or particles in the flow stream, and is suitable for aerated or dirty liquids.

Products for Ultrasonic Flow Meters solutions

Specifications of Ultrasonic Flowmeters

Item

Principle and parameters

Converter

Principle

Transit-time,4 byte floating-point operation in accordance with IEEE754

Accuracy

Inline type:flow meter:±0.5%; heat meter:±1.0%

Clamp on type:flow meter:±1.0%; heat meter:±2.0%

Insertion type:flow meter:±1.0%; heat meter:±2.0%

 

Operation

4-key manipulation with magnetic bar touch or figer touch;

simulation keyboard software

Output

One way 4-20mA analog output

One way OCT pulse signal output

One way Relay output

Input

3 way 4-20mA analog input,accuracy:0.1%;

Acquisition signal of temperature,press and liquid level

Achieve heat measurement by connecting 3-wired PT100

Temperature sensor

Data interface

RS485 serial interface,upgraded by computer,support MODBUS communication protocol

Special cable

Twisted-pair shielded cable and cable length should be no more than 50 m.Transmission distance can achieve 1 km if select the RS 485 interface

pipeline

Pipe material

Steel,stainless,copper,cement,PVC,aluminum,glass steel, cast iron

Pipe diameter

DN15mm-DN6000mm

Straight pipeline

Transducers installation points should be:10 diameters’ straight pipeline from upstream transducer ,5 diameters’ 

straight pipeline from the downstream transducer ;30 diameters’ straight pipeline from the pump

Measuring

Medium

 

Liquid type

Single liquid that can conduct sound wave,such as water,

Seawater, sewage,plant effluent,chemicals,alcohol,beer,oil

etc.

Fluid temperature

-30℃-160

Turbidity

10000ppm,with little bubble

Fluid velocity

0m/s-7m/s

Working

Environment

Temperature

Converter:-20℃-60℃;transducer:-30-160

Humidity

Both of the converter and transducers can work under water,depth underwater ≤2m(After completely sealing)

Power supply

DC8-36V;AC85-264V(optional)

Power consumption

1.5W

ultrasonic flow meter pDF

The Working Principle of Ultrasonic Flow Measurement

Video source: https://www.youtube.com/embed/Bx2RnrfLkQg?start=16

Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe.

At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe, and its reflections from the fluid are the same.

Under flowing conditions, the frequency of the reflected wave is different, due to the Doppler effect.

When the fluid moves faster, the frequency shift increases linearly.

The transmitter processes signals from the transmitted wave, and its reflections to determine the flow rate.

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

Ultrasonic flow meter advantages and disadvantages

Generally, an ultrasonic flow meter is the device, that uses ultrasound to measure the velocity of liquid flow, that helps in determining the volume of liquid flow also.

The ultrasonic flow meters are made using the ultrasonic transducers, which are clamped to the external surface of a pipe, to generate the ultrasonic pulses through the pipe.

When the liquid flows inside the pipe, it creates the time difference in the pulses, and these are examined to calculate the accurate flow velocity of the liquid.

There are many advantages of using the ULTRASONIC flow meters which include:

  • The electronics in the ultrasonic flow meter includes ultrasonic flowmeter detector which compensates and adapts to the changes in the profile of the flow, type of the liquid and material of the pipe.
  • A portable ultrasonic flow meter converter can be used as a direct method to determine the flow rates effectively when compared to the other flow systems.
  • Ultrasonic flow meter converter is inexpensive to use and maintain when compared to the other mechanical flow meters as they are no moving parts in these flow meters.
  • Their design is highly sophisticated and they do not obstruct the liquid flow, so they can be used for sanitary, corrosive and abrasive liquids.

These are the advantages of the ultrasonic flow meters and there are many disadvantages of the Ultrasonic flow meter which include:

  • The main disadvantage of the ultrasonic flow meter is the cost. The cost of the flow meter is very high when compared to the other types of mechanical flow meters.
  • The ultrasonic flow meters are sophisticated when compared to the mechanical flow meters, so it needs experts to repair and maintain the flow meters.

These are the advantages and disadvantages of the ultrasonic flow meters.

Ultrasonic flow meter Types

  1. According to the measurement principle

(1) Time difference method ultrasonic flowmeter;
(2) Frequency difference method ultrasonic flowmeter;
(3) Phase difference method ultrasonic flowmeter;
(4) Doppler ultrasonic flowmeter;
(5) Ultrasonic flowmeters for partially full pipes and river channels that combine liquid level measurement and average velocity measurement.

  1. According to usage

(1) Portable ultrasonic flowmeter;
(2) Fixed (standard pipe section) ultrasonic flowmeter.

  1. According to the installation method of the transducer

(1) Standard pipe section ultrasonic flowmeter;
(2) Clip-on ultrasonic flowmeter;
(3) On-site plug-in ultrasonic flowmeter with hole opening.

  1. According to whether the transducer is in contact with the fluid

(1) Immersion (contact) ultrasonic flowmeter;
(2) Non-invasive (non-contact) ultrasonic flowmeter.

  1. According to the nature of the measured fluid

(1) Liquid ultrasonic flowmeter;
(2) Gas ultrasonic flowmeter.

  1. According to the number of transducer channels

(1) Mono ultrasonic flowmeter;
(2) Two-channel ultrasonic flowmeter;
(3) Multi-channel ultrasonic flowmeter.

Extended Reading: Inline Ultrasonic Flow Meter

Ultrasonic Clamp on Flow Meter is composed of an integrated host and external clamp on sensors. Clamp on Flow Sensors are available at room temperature and high temperature.

Clamp on flow meter (Model: 2000) is composed of an integrated host and ultrasonic clamp on sensor. Clamp on flow meter is widely used in online flow measurement of various liquids. Just stick the external clamp sensor on the pipe surface. Compared with the traditional flowmeter, it does not need to cut off the pipe and flow. The installation is convenient and quick, and the non-destructive installation is truly realized.

Extended reading: Ultrasonic flow detectors types

Portable Ultrasonic Flow Meter is a handheld ultrasonic flow meter. The clamp-on sensor is used to measure liquid flow in industrial pipelines.

Handheld ultrasonic flow meter realizes the non-contact measurement of liquid flow. Also often referred to as Portable Clamp-On Ultrasonic Flow Meter for Liquids.

Handheld Ultrasonic Flow Meter ( Model:2000H) has been successfully applied to measurement work in various industries. The measuring range is 20-6000mm (0.5-20 inches). A non-contact measurement method is adopted. Flexible operation and easy to carry. Conductive or non-conductive, corrosive or non-corrosive liquids can be measured. Various fluids: water, pure water, sewage, sea water, chemical fluids, river water, fuel Oil etc. can be measured.

Extended reading: Portable ultrasonic flow meter for water

Ultrasonic flow meter price

Sino-Inst offers Ultrasonic flow meters with the best quality and best price.

The reference price is between USD 150-700.

The price of ultrasonic flow meter is affected by:

  • Types of sensors
  • Materials
  • Cable length

All of our Flow Meters can work with the NEW AMS TREX !

Ultrasonic flow meter manufacturer

Sino-Inst offers 20 Ultrasonic flow meter products, with Best Price.

Sino-Inst is the manufacturer and supplier of ultrasonic flow meters.

About 13% of these are Petroleum& Chemical flow meters, 4% are water treatment flow indicators. The best Reference price is USD 2000-7000.

A wide variety of ultrasonic flow meter options are available to you, such as free samples, paid samples.

Sino-Inst is clamp-on ultrasonic flow meter suppliers, located in China.

Clamp-on ultrasonic flow meter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitter respectively.

You can ensure product safety by selecting from a certified supplier,

with ISO9001, ISO14001 certification.

In addition to measuring flow rate, ultrasonic technology can also be used to measure liquid level.
The ultrasonic liquid level sensor is also an excellent product for measuring the liquid level of the tank.

Procurement Guide: Ultrasonic liquid level sensors

CO2 Cylinder | Portable Liquid Level Gauge

Frequently
Asked
Questions

Fuel flow meters, also known as turbine flow meters, are the main types of speed flow meters. A freely rotatable impeller is installed in the fluid flowing pipe. When the fluid passes, its motion can make the impeller rotate. The larger the fluid flow rate, the larger the kinetic energy and the higher the impeller speed.

The fluid flow can be determined by measuring the number of revolutions or the number of revolutions of the impeller.

Ultrasonic flow detector is also an ultrasonic sensor. Or called an ultrasonic flowmeter.
Ultrasonic flow detector is composed of sensor and host. The host has wall-mounted, handheld, portable, etc. Sensors are classified into the following models according to the measuring pipe diameter and measuring temperature. It can help users measure pipeline flow under various working conditions.

Optional Transducer

Ultrasonic flowmeter refers to a flowmeter developed based on the principle that the propagation velocity of ultrasonic waves in a flowing medium is equal to the vector sum of the average velocity of the measured medium and the velocity of sound waves in a stationary medium.

It is mainly composed of transducer and converter, and there are different types such as Doppler method, velocity difference method, beam shifting method, noise method and correlation method.

Clamp-on or tube-segment ultrasonic flow meter is based on the principle of “velocity difference method”. It is an instrument for measuring the liquid flow in a circular tube.

Ultrasonic flow meters for measuring liquid flow. Measurement linearity is better than 0.5%. Repeatability accuracy is better than 0.2%. The time difference measurement resolution of up to 40 picoseconds enables the measurement accuracy to reach ±1%.

When choosing an ultrasonic flowmeter, the following points are mainly considered:

1.Measuring medium. 2. Pipe material. 3. Velocity range. 4. Diameter range. 5. Applicable temperature. 6. Medium turbidity. 7. Pipe lining. 8. Acceptable form of installation.

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Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. It can measure even liquids such as water, sea water, oil, and slurry.

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

Clamp-on Ultrasonic Gas Flow Meter

Clamp-on Ultrasonic gas flow meters, also called ultrasonic natural gas flow meters, measure liquids, and gas in industrial flow measurement applications.

Ultrasonic gas flow meters are one of the most reliable solutions,

for challenging gas flow measurement applications. (Kind like the portable ultrasonic)

Because the sensor is clamped on to the outside of the pipe,

it is immune to the process compatibility,

concerns of an in-line flow metering technology (What is a flow meter? ).

​​It is now possible to measure natural gassteamcompressed airhydrogen

compressed air and many more using clamp-on flow meters.

Our transducer technology is also ideal for shale gas,

and coal seam gas wellhead applications.

SI-3128 wall mounted ultrasonic flow meter could be applied to a variety of liquid applications,

including ultra-pure liquids, water, chemicals, raw sewage,

reclaimed water, cooling water, river water, plant effluent, alcohol, beer, etc.

What are the types of flow meter?

Features of Clamp-on Ultrasonic Gas Flow Meter

Ultrasonic Flow Meter SI-3128
  • Accuracy: 1%
  • Ingress protection level: IP67 (transmitter), IP68 (sensor)
  • Wide measurement range, pipe size from DN15mm to DN6000mm.
  • Three installation types: wall mounting, DIN-rail mounting, explosion-proof box mounting
  • Could operate with temperature sensors for heat/energy measurement.
  • Could be installed without shut down equipment operation

Specifications for Clamp-on Ultrasonic Gas Flow Meter

Items

Performance Parameter

 

 

      Host

 

Principle

Transit- time ultrasonic flowmeter

Accuracy

±1%

Display

2X20 character LCD with backlight, support the language of Chinese, English and Italy

Signal

Output

1 way 4~20mA output, electric resistance 0~ 1K, accuracy 0. 1%(optional)

1 way OCT pulse output(Pulse width 6~1000ms, default is 200ms)

1 way Relay output

 

Signal

Input

3 way 4~20mA input, accuracy 0. 1%, acquisition signal such as temperature, press and liquid level

Connect the temperature transducer Pt100, can finish the heat/energy measurement

Data

Interface

Insulate Rs485 serial interface, upgrade the flowmeter software by computer, support the MODBUS

Special Cable

Twisted-pair cable, generally, the length under 50 meters ; Select the RS485, transmission distance can over 1000m

Pipe

Installation

Condition

Pipe

Material

Steel, Stainless steel, Cast iron, Copper, Cement pipe, PVC, Aluminum, Glass steel product, liner is allowed

Pipe

Diameter

DN32~6000mm

Straight

Pipe

Transducer installation should be satisfied: upstream10D, downstream 5D, 30D from the pump

Measuring

Medium

Medium

water,sea water ,alcohol,Acid and alkali,waste water,beer,all kinds of oil Single liquid can transmit sound wave.

Temperature

-30~160℃

Turbidity

No more than 10000ppm and less bubble

Flowrate

0~±7m/s,Forward and backward measurement

Work environment

Protection grade

Host:IP67;flow sensor:IP68

temperature

Host:-20~60℃;flow sensor:-30~ 160℃

Humidity

Host: 85%RH; Flow sensor:can measure under water, water depth^2m (tansducer sealed glue)

Power Supply

DC8~36V or AC85~264V

Power

Consumption

1.5W

Dimension

132*150*85mm(host)

You may like: Vortex shedding flow meter

Gases that can be measured with ultrasonic clamp-on flowmeters include:

Compressed AirHydrogenOxygen
NitrogenSteamNatural Gas
PropaneButaneCorrosive Gases
Erosive GasesHigh Purity GasesSterile Gases
Toxic GasesInert GasesCompressed Air

What is ultrasonic gas meter?

Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe.

At no flow conditions,

the frequencies of an ultrasonic wave transmitted into a pipe,

and its reflections from the fluid are the same.

Under flowing conditions, the frequency of the reflected wave is different due to the Doppler effect.

When the fluid moves faster, the frequency shift increases linearly.

The transmitter processes signals from the transmitted wave,

and its reflections to determine the flow rate.

Transit time ultrasonic flowmeters send and receive ultrasonic waves,

between transducers in both the upstream and downstream directions in the pipe.

At no flow conditions,

it takes the same time to travel upstream and downstream between the transducers.

Under flowing conditions, the upstream wave will travel slower and take more time than the (faster) downstream wave.

When the fluid moves faster, the difference between the upstream and downstream times increases.

The transmitter processes upstream and downstream times to determine the flow rate.

They represent about 12% of all flowmeters sold.

The ultrasonic principle can also be used to measure water depth. Please refer to Portable Ultrasonic Water Depth Gauge for water depth measurement.

You may like: Nitrogen flow meter

How does a clamp-on flow meter work?

A clamp-on ultrasonic gas flow meter produces signals,

that is five to ten times more powerful,

then those of traditional ultrasonic transducers.

The new clamp-on transducers produce clean, coded signals with very minimal background noise.

The result is that a clamp-on gas flow meter can now provide optimum performance,

even with low-density gas applications.

Today, our ultrasonic clamp-on gas flowmeters such as the SI-3128 can measure the flow of any gas,

and then calculate mass flow using a pressure transmitter connected to the analog input.

Inline ultrasonic flowmeters

The SI-3000H Portable Ultrasonic Flowmeter is a widely used time difference ultrasonic flowmeter,

for on-line calibration and inspection of liquid flow in various industrial sites.

Handheld ultrasonic flow meter, also known as Portable Doppler flow meter, or Inline ultrasonic flow meter.

SI-2000H handheld ultrasonic flow meter is a representative of portable ultrasonic flow meters.

More Gas Flow Meters

Sino-Instrument offers 20 Gas flow meter products, with Best Price.

About 13% of these are Petroleum& Chemical flow meters, 4% are water treatment flow indicators.

The best Reference price is USD 2000-7000.

A wide variety of gas flow meter options are available to you, such as free samples, paid samples.

Sino-Instrument is clamp-on ultrasonic flow meter suppliers, located in China.

clamp-on ultrasonic flow meter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitter respectively.

You can ensure product safety by selecting from a certified supplier,

with ISO9001, ISO14001 certification.

Of course, you can also choose other gas flow measurement instruments, like:

https://www.drurylandetheatre.com/coriolis-mass-flow-meter-si3131/
https://www.drurylandetheatre.com/steam-flow-meter-inline-vortex-flow-meters/
https://www.drurylandetheatre.com/magnetic-flow-meters/
https://www.drurylandetheatre.com/si-rsl-thermal-mass-flowmeters/

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