Industrial Measurement and Control Solutions

Posted on October 1, 2020 by KimGuo11

Detection and Analysis Sloutions

Pressure Measurement Sloutions

Level Measurement Solutions

Flow Measurement Solutions

Temperature Measurement Solutions

Torque Measurement Solutions

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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Turbine Flow meter Vs Gear Flow meter

Posted on September 20, 2020 by KimGuo11

When you need to measure oil flow, do you also encounter a problem: Turbine Flow meter Vs Gear Flow meter? How to choose?

Turbine flow meters and gear flow meters are commonly used flow meters. Although there is only one word difference literally, there are still different essential differences between the two.

RFQ Flow Meters

Turbine Flow meter

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

Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS and other computer control systems.

Know more about: Turbine type Flow Meter for Liquid & Gas technology

Gear Flow meter

Oval gear flowmeter is a precision instrument used to measure liquid flow. It is a direct reading cumulative meter. It is a positive displacement flow meter that measures the sum of the liquid flow through the pipeline.

The oval gear flowmeter can choose two counting mechanisms: mechanical display meter and electronic display meter. The display meter has the functions of displaying cumulative flow, instantaneous flow, and zero return. It can realize on-site display and remote control.

For different measuring media (acid, alkali, organic liquid, oil, food, etc.), the flowmeter can be made of different materials (cast steel, stainless steel, and 316). It is suitable for flow measurement in chemical, petroleum, pharmaceutical, electric power, metallurgy, and food industries. Extended reading: Cylinder Gear flow meter for micro flow measurement.

Let’s sort it out for everyone:

Turbine Flow meter Vs Gear Flow meter

1. Different measurement principles:

The liquid turbine flowmeter is a velocity flowmeter. The accuracy is 0.5%, which can be improved to 0.2%. The material of the watch body is generally stainless steel. According to site requirements, explosion-proof products can be made.

Oval gear flowmeter is a positive displacement flowmeter. The accuracy is 0.5%. Oval gear flowmeter is a purely mechanical mechanism. When the rotor of the flowmeter rotates, it drives the rotation of the counter to generate a cumulative total. Oval gear flowmeters are especially popular on occasions where explosion-proof requirements are relatively high.

2. Requirements of the working pressure:

The working pressure of the oval gear flowmeter is generally not large, 1.6Mpa. Using cast steel material, it can reach 2.5Mpa.

In contrast, turbine flowmeters are easier to make into high-pressure products. The maximum pressure of the high-pressure turbine flowmeter can reach over 25Mpa.

Requirements for low working pressure:

Turbine flowmeter does not have much requirement for the low working pressure in the pipeline, basically, it can be measured when the medium flows through it.

However, oval gear flow meters have higher requirements for small working pressures. Because of the different calibers, the pressure required to push the flowmeter rotor to work is different. The small working pressure required from small diameter to large diameter is between 0.3~0.8Mpa.

Extended reading: Positive displacement flow meter working principle

3. The influence of working temperature:

The maximum working temperature of the turbine flowmeter is 120°C. The maximum working temperature of the oval gear flowmeter is 160℃.

4. The difference of applicable media:

Water, solvents, light oils, etc. can be well suited for liquid turbine flow meters, but media with too high viscosity are not suitable.

The elliptical gear flowmeter is generally suitable for oily media. The viscosity of the applicable medium is higher than that of the turbine flowmeter. The greater the viscosity of the medium, the higher the accuracy.

For some corrosive media, both types of flowmeters can partially measure.

But the stainless steel oval gear flowmeter is not cost-effective. And for water and some electrolyte solutions, oval gear flow meters cannot be used. Because the internal mechanical parts are easily damaged by water.

Extended reading: Turbine flow meter Applications

Turbine Flow Meter Application Case: Demineralized Water.

5. Requirements on the installation site:

As a positive displacement flowmeter, the elliptical gear flowmeter has relatively low requirements for the straight pipe sections before and after and basically has no requirements for straight pipe sections.

The turbine flowmeter, as a velocity flowmeter, has higher requirements for the front and rear straight pipe sections. Especially for some small diameter turbine flowmeters, a corresponding straight pipe section must be matched.

Extended reading: Turbine Insertion Flow Meter for Large Diameter Pipeline

6. The difference between display and signal output:

The mechanical meter head of the oval gear flowmeter displays the cumulative amount. To display the instantaneous flow, you need to output a signal, and the matching secondary instrument displays the instantaneous flow value.

Turbine flowmeter can display instantaneous flow and accumulated flow on-site, and can also output with the remote signal.

7. The problem of maintaining accuracy:

The accuracy of turbine flow meters and oval gear flow meters cannot be maintained for a long time. In order to maintain the accuracy of the flowmeter, it must be calibrated regularly.

You may need to measure the flow of lubricating oil, diesel, fuel, hydraulic oil, etc.
Combine the above points and your requirements. You should be able to decide which flow meter to choose. If you still have technical questions, please contact our sales engineers in time.

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

Turbine Flow Meter Specification

Product Name:	Liquid Turbine Flowmeter
Measuring medium:	water, oil, alcohol and other liquids (viscosity <5×10-6M2/S)
Diameter range:	DN4~DN200 (DN4~80 commonly used thread connection)
Accuracy class:	±1%R; ±0.5%R; ±0.2%R (special customization)
Output signal:	square wave pulse (voltage type), 4-20MA, 0-5V (intelligent type)
Operating environment:	-20℃~+60℃; 5%~90%RH
Connection method:	external/internal thread, flange, clamp
Communication method:	RS485 communication MODBUS-RTU (intelligent type)
Body material:	stainless steel 1CR18NI9TI, 316L (hygienic type)
Protection class:	IP65 (ordinary type); IP68 (special custom)

Turbine Flow meter Vs Gear Flow meter working principle

About the working principle of Turbine Flow meter Vs Gear Flow meter. I think the following video provides a good explanation. let’s look at it together:

Video source: https://www.youtube.com/watch?v=7_2Ha0j9W0A&t=25s

Video source: https://youtu.be/pplr5hSQ-34?t=9

Turbine Flow Meter Advantages and Disadvantages

Advantages:

High precision. Generally up to ±1%R, ±0.5%R.
Output pulse frequency signal. It is suitable for total measurement and connection with computer. No zero drift, strong anti-interference ability.
The structure is compact and lightweight. Easy installation and maintenance. Great flow capacity.
Good repeatability, short-term repeatability can reach 0.05~0.2%. It is because of good repeatability. Frequent calibration or in-line calibration results in extremely high accuracy.
There are many types of special sensors. It can be specially designed according to user needs. Such as: low temperature type, bidirectional, downhole type, special type for sand mixing, etc.
The pressure compensation can be performed under the stable pressure state of the measured gas.
The range is wide, the medium and large diameters can reach 1:20, and the small diameters are 1:10.

Disadvantages:

Regular calibration is required. There is no way to maintain accuracy for long periods of time. Cannot work continuously for a long time.
Higher requirements for the cleanliness of the medium. But filters can be installed.
The flowmeter is greatly affected by the flow velocity distribution of the incoming flow (a flow regulator can be installed).
It is not suitable for places where the flow rate changes rapidly.
Not suitable for testing corrosive media.

Turbine Type Flow Meter Installation Guidelines

In order to ensure the accurate measurement of the turbine flowmeter, the installation location and method must be selected correctly.

Requirements for straight pipe sections:
- The flowmeter must be installed horizontally on the pipeline (the inclination of the pipeline is within 50), the axis of the flowmeter should be concentric with the axis of the pipeline during installation, and the flow direction should be consistent.
- The length of the upstream pipeline of the flowmeter should have an equal diameter straight pipe section of not less than 2D. If the installation site is allowed, it is recommended that the upstream straight pipe section is 20D and the downstream is 5D.

Requirements for piping:
The inner diameter of the upstream and downstream piping at the installation point of the flowmeter is the same as the inner diameter of the flowmeter.
Requirements for bypass pipes:
In order to ensure that the normal use of the medium is not affected during the maintenance of the flowmeter, a cut-off valve (stop valve) should be installed on the front and rear pipelines of the flowmeter, and a bypass pipeline should be set at the same time. The flow control valve should be installed downstream of the flowmeter. When the flowmeter is used, the shut-off valve installed upstream must be fully opened to avoid unstable flow of the fluid in the upstream part.
Requirements for the external environment:
The turbine flowmeter is best installed indoors. When it must be installed outdoors, sun protection, rain protection and lightning protection measures must be adopted to avoid affecting the service life.
Requirements for impurities contained in the medium:
In order to ensure the service life of the flowmeter, a filter should be installed before the straight pipe section of the flowmeter.
Installation site:
The flowmeter should be installed in a place that is easy to maintain and free from strong electromagnetic interference and heat radiation
Requirements for installation and welding:
The user can configure a pair of standard flanges to be welded on the front and rear pipes. Welding with flow meter is not allowed!
Before installing the flowmeter, the welding slag and other dirt in the pipeline should be strictly removed. To ensure that the flowmeter is not damaged during use.

Frequently
Asked
Questions

Help Center

If the flowmeter is divided into 5 categories. Then the five commonly used flowmeters are:

Electromagnetic flowmeter
Differential pressure flowmeter
Turbine flowmeter
Ultrasonic flowmeter
Volumetric flowmeter (PD)

For liquids, it is generally ±0.25%R－±0.5%R,
High precision type can reach ±0.15%R;

And the medium is gas, generally ±1%R－±1.5%R;
The special type is ±0.5%R－±1%R.

Turbine flowmeter is the main type of velocity flowmeter. It uses a multi-blade rotor (turbine) to sense the average flow rate of the fluid, and derives the flow or total amount of the meter.

More abou: More Details About Turbine Flow Meter

For different working principle, 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

Turbine flowmeters are widely used in the following measurement objects:
Petroleum, organic liquids, inorganic liquids, liquefied gases, natural gas, natural gas and cryogenic fluids.

Transshipment and centralized transportation stations for liquefied petroleum gas, refined oil and light crude oil abroad. The first and second stations of large crude oil pipelines are widely used for trade settlement.

Inaccurate level measurement of liquid ammonia storage tank

Posted on September 15, 2020 by KimGuo11

The liquid level of the liquid ammonia storage tank is accurately measured, which can eliminate potential safety hazards.

Choosing a suitable monitoring instrument for liquid ammonia storage is a prerequisite for ensuring safe production. The main instruments in the liquid ammonia tank area include liquid level, temperature, pressure, toxic (flammable) gas alarms, etc. For tank farms where the system is rebuilt, and environments where wiring is difficult, wireless instrumentation solutions can be used.

This article analyzes the application problems of several common liquid ammonia storage tank level measuring instruments. So as to provide a basis for the selection of measuring instruments.

About Liquid Ammonia Storage Tank

Liquid ammonia is a common chemical raw material. To facilitate transportation and storage, gaseous ammonia is usually pressurized or cooled to obtain liquid ammonia. When liquid ammonia is dissolved in water, ammonium ion NH4+ and hydroxide ion OH- are formed, and the solution is alkaline. Liquid ammonia is mostly stored in pressure cylinders or steel tanks. Liquid ammonia is widely used in industry, is corrosive and easily volatile, so its chemical accident rate is very high.

Application Analysis of Common liquid Ammonia Storage Tank Level Measuring Instruments

External liquid level sensor

The external level gauge is an instrument that uses the sonar ranging principle and “micro-vibration analysis” technology to measure the level from the outside of the container. No need to make holes on the tank wall, no flanges, no fire, no tank cleaning. Do not touch the liquid and gas in the tank. It can realize online installation and maintenance. It is a completely non-contact isolated instrument.

HS-2000 Ultrasonic Tank Level Sensor-External Mounted

HS-2000 External Mounted Ultrasonic Tank Level Sensor- (referred to as “external level gauge”). It adopts advanced signal processing technology and high-speed signal processing chip. It breaks through the influence of container wall thickness. Realizes the height of the liquid level in the closed container True non-contact measurement.

The ultrasonic liquid level sensor (probe) is installed directly under the outer wall (bottom) of the container under test. Calibrate the outer wall of the probe. There is no need to open holes for the container to be tested, easy to install, and does not affect production. It can accurately measure the level of various toxic substances, strong acids, strong alkalis and various pure liquids in high-pressure airtight containers. The HS-2000 External Mounted Ultrasonic Tank Level Sensor has no special requirements for the material of the liquid medium and the container. The explosion-proof design is adopted to meet the explosion-proof requirements.

The external liquid level sensor continuously and accurately measures the liquid level in the tank from outside the tank. No contact with the liquid and gas in the tank at all, realizing a true isolation measurement. Therefore, the characteristics are as follows:

Isolated non-contact liquid level measurement technology is very safe.
Installation and debugging, thereby reducing construction and maintenance costs.
It is more reliable and durable. There are no mechanical moving parts in the measuring probe and host, and it is strictly sealed, isolated from the outside world, and will not be worn or corroded.
Pass the “functional safety integrity” level certification.

Differential pressure transmitter

One end of the differential pressure transmitter is connected to the liquid phase, and the other end is connected to the gas phase. The liquid level of the liquid ammonia storage tank can be measured using the principle of hydrostatics.

In the process of applying this instrument and equipment, it is necessary to strictly control the installation height of the equipment.

Generally, it needs to be installed below the lower interface of the liquid level pressure interface of the container under test. And choose easy to maintain and observe. At the same time, it is also close to the pressure taking part.

Taking into account the low boiling point and easy vaporization of liquid ammonia, it is necessary to use a double flange differential pressure transmitter to ensure the stability of the measurement signal.

If this device is used, the installation of the device will only be limited by the length of the capillary tube.

Specifically, it is necessary to take corresponding protection and insulation measures, and ensure that the bending radius of the capillary is greater than 50mm. When using this measuring instrument, if the installation elevation changes, the output value of the device will be affected.

Differential pressure(DP) level transmitter is often used as a tank level transmitter. The DP transmitter is connected with a stainless steel flange by capillary. Flange installation. The pressure is sensed by a remote transmission device installed on container. The pressure is transmitted to the body of the transmitter through the capillary. The transmitter convert the pressure or differential pressure to 4 ～ 20mA. The DC signal is output. It can communicate for the setting and monitoring by cooperating with the HART communicator. Explosion proof available.

From the application effect point of view, the differential pressure transmitter has the characteristics of easy calibration and a wide range of popularization. At the same time, the price of this type of equipment is low, and it has a certain cost-effective advantage.

However, when installing the device, it is necessary to reserve mounting holes. At the same time, due to the close relationship between the equipment and the density change of the medium, the measurement operation will cause the material of the instrument diaphragm to be corroded by the corrosive medium. After a long time of operation, the equipment is prone to deformation of the capsule.

In the application process, if there is no indication, the indication is too large or too small and the indication remains unchanged. It is also necessary to check the power supply, safety barriers, circuit boards, diaphragm capillaries and pressure valves. And appropriately replace the equipment components and open the equipment pressure valve in time.

Magnetic flap level gauge

The application of the magnetic flap level gauge follows the law of float and the principle of magnetism, and needs to be connected to the tank through a flange.

During the measurement, the two-color cylindrical magnetic float inside the device will change under the influence of the magnetic field, and the float junction is the actual liquid level of the storage tank.

In the process of installing the equipment, it is necessary to avoid magnetic materials around the equipment, and determine the heating temperature according to the medium condition. In the case of large gas-liquid-phase opening connections, a flange needs to be installed in the middle of the level gauge.

In the process of equipment debugging, a magnetic steel corrector is needed to adjust the magnetic column to white, and then open the gas phase stop valve and the liquid phase stop valve successively, and observe the liquid level rise and fall.

The magnetic flap level gauge can measure the liquid level and interface of any medium, and the equipment itself has the characteristics of convenient and intuitive installation.

However, if there are too many impurities in the medium, the magnetic column will not flip and the measurement will fail.

At the same time, the application of this device is prone to the problem of magnetic column jamming, which will lead to the failure of remote transmission instructions. However, the price of this equipment is low, and installation holes need to be reserved during installation.

The magnetic flap level gauge is prone to problems such as no signal output from the transmitter, no change in the output signal and the range cannot be adjusted to the corresponding value during the application process. In the application process, the power supply voltage, cables, terminal pins and safety barriers need to be checked.

Cable guided wave radar liquid level sensor

The application of the cable guided wave radar level gauge follows the principle of travel time, and it is necessary to measure the distance from the reference point to the surface of the liquid ammonia by transmitting and receiving high-frequency pulse signals.

When installing the equipment, it is necessary to avoid the liquid ammonia inlet to prevent false reflections from the equipment.

When installing the sensor, it cannot be installed in the center of the tank, and the sensor must be kept away from the tank wall.

When installing the cable probe, the distance between the probe and the smooth metal wall should be greater than 50mm, the distance between the end of the probe and the bottom of the container should be greater than 0mm, and the diameter of the short tube should not be greater than 0mm. In addition, depending on the installation position, the offset of the cable probe may increase.

Guided wave radar is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light. The operating time can be converted into level signals by electronic components. The probe emits high-frequency pulses and propagates along the cable or rod probe. When the pulse meets the surface of the material, it is reflected back and received by the receiver in the instrument. And convert the distance signal into level signal. SIRD-701 Guided Wave Radar Level Sensor is suitable for liquid and Bulk Solids measurement, and complex process conditions.

The cable-type guided wave radar level gauge has the characteristics of direct contact with the medium and small measurement blind area, and the measurement accuracy is high.

However, this equipment is not suitable for measuring pressure vessels, and the price is relatively high. It is necessary to reserve mounting holes on the top of the equipment during installation.

From the point of view of application failures, the equipment may have failures such as incorrect DCS system configuration, cable probe failure, and unstable DCS display value.

In the application process, it is necessary to carry out on-site measurement before calibration, and it is not necessary to check whether the DCS configuration data is consistent with the actual measurement result in order to obtain the real data.

Before measurement, you need to clean the probe and increase the height of the empty tank appropriately to eliminate the effect of echo.

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KimGuo11

drurylandetheatre.com

Use Differential Pressure Transmitter to Measure Liquid Level

Posted on September 12, 2020 by KimGuo11

Differential Pressure Level transmitter for Continuous tank level measurement.

A liquid level measurement solution that prevents the measured medium from directly acting on the transmitter.itle

In the chemical production, the medium often encounters problems such as impurities, crystal particles or agglomeration. It is easy to block the connecting pipeline. At this time, a flange-type differential pressure transmitter is required.

Silicone oil is filled in the closed system composed of the bellows, capillary tube and measuring chamber as the pressure transmission medium. The measured medium does not enter the capillary tube and the transmitter to avoid blockage.

**Flange Mounted Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

Differential Pressure Level transmitters are divided into single flange type and double flange type according to their structure.

Only a flange between the container and the transmitter is called a single flange differential pressure transmitter.

As for the closed container whose upper end is isolated from the atmosphere, the upper space and atmospheric pressure are mostly different. Two flanges must be used to guide the liquid and gas phase pressure to the differential pressure transmitter. This is the double flange differential pressure transmitter.

Differential Pressure Level transmitter for open containers

Open tank level measurement means that the tank is open to the atmosphere. Any change in atmospheric pressure will affect the process fluid pressure in the tank. In this liquid level measurement application, the low pressure side of the transmitter can measure the atmospheric pressure. This eliminates the influence of atmospheric pressure on the tank liquid level. The high-pressure side of the transmitter is connected to the tank. Therefore, the actual liquid level in the tank can be measured.

A single flange is used to measure the liquid level of an open tank.

Differential pressure range calculation method: Need to measure the height of the liquid level (unit: m) × acceleration of gravity (9.8) × measured medium density (unit: g/cm3) differential pressure range (unit: KPa).

The selection must know the measurement medium, measuring range, medium temperature, the size and pressure rating of the process connection flange, and the flange standard.

Image Source: https://www.yokogawa.com/in/library/resources/media-publications/how-to-avoid-temperature-effects-in-differential-pressure-level-measurements/

Extended Reading: Differential Pressure (DP) Flow Meters Technology

Differential Pressure Level transmitter for closed containers

For airtight containers, the inside is isolated from the atmosphere. When the process fluid fills or empties the tank, the pressure in the tank may change from positive pressure to vacuum. This change in tank pressure will directly affect the measured liquid level unless it is compensated for. This can be done by connecting the low-side pipe of the differential pressure transmitter to the top of the tank. Therefore, when measuring the liquid level of a closed tank, a differential pressure transmitter must be used.

Double flanges are used to measure the liquid level of a closed tank.

The calculation method of the differential pressure range: the height of the liquid level to be measured (unit: m) × acceleration of gravity (9.8) × (the density of the measured medium-the density of the capillary filling liquid) (unit: g/cm3) = differential pressure range (unit: KPa).

The selection must know the measurement medium, measuring range, medium temperature, pressure, capillary length, the size and pressure rating of the process connection flange and the flange standard

If you need to measure river water level, open channel level, etc. The Ultrasonic Liquid Level Sensor can be used for non-contact continuous level monitoring.

Differential pressure level transmitter working principle

When using Differential pressure (DP) level transmitter to measure the liquid level as shown in the figure below.
The measured liquid density in the figure is ρ.
The working medium density in the capillary of the double flange differential pressure transmitter is ρ0.
The measuring range of the measured liquid level is H.
The center distance of the sampling tube of the measured liquid level is h.
It can be seen from the figure that the maximum measurement range of the liquid level △ P = P + —P- = H × ρ × g-h × ρ0 × g.

It can be seen from the formula that the dual-flange differential pressure transmitter should perform negative migration. The migration amount S is h × ρ0 × g. And the installation position of the double flange differential pressure transmitter has no effect on the migration amount and the measurement result.

Extended reading: Hydrostatic Level Measurement

The dual-flange differential pressure transmitter requires negative migration.

When the measured liquid level is 0, the pressure difference between the positive and negative measurement chambers of the remote differential pressure transmitter is the largest. The output current of the double flange differential pressure transmitter is 4mA.

As the measured liquid level rises, the pressure difference between the positive and negative measurement chambers of the transmitter gradually decreases.

When the measured liquid level rises to the highest Hmax. The pressure difference between the positive and negative measurement chambers of the transmitter is the smallest. The output current of the double flange differential pressure transmitter is 20mA.

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

You may like:

Sino-Inst offers overs 100 DP transmitters for liquid level, pressure, flow, temperature measurement. Differential pressure (dp) level transmitters suit to measeure water and other liquid level.

A wide variety of DP level transmitters are available to you. Such as SMT3151LT Differential pressure level transmitter.

You can also choose from liquid flow meter and pressure transmitters, not specified. We are differential pressure level transmitter suppliers, located in China. The top supplying country is China(Mainland), which supply 100% of DP transmiters respectively.

KimGuo11

drurylandetheatre.com

Temperature Sensor Transmitter—-Do You Know?

Posted on August 7, 2020 by Rocket

Temperature sensor transmitter is a combination of temperature sensor and temperature transmitter. It can be used in chemistry and medicine.

Thermocouple, thermal resistance and temperature transmitter of SBW series are the temperature transmitter units of on-site installation type in DDZ series instruments and they are used by matching with industrial thermocouple, thermal resistance. It uses dual-wire transmission mode(two conducting wires are used as the common transmission lines for power input and signal output).

It transforms the industrial thermocouple, thermal resistance signal into 4-20mA and 0-10 mA output signals which are linear with input signal and temperature signal. The transmitter can be directly installed in the junction box of the thermocouple and thermal resistance so as to form an integrated structure. As the temperature measuring instruments of new generation, it is widely used in metallurgy, petroleum, chemical industry, electric power, light industry, textile, food, national defense, scientific research and other industrial sectors.

Sino-Inst offers a variety of Temperature sensor transmitter. If you have any questions, please contact our sales engineers.

The Difference Between Temperature Sensor Transmitter

A temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. Temperature sensor is the core part of temperature measuring instrument, and there are many types. According to the measurement method, it can be divided into two categories: contact type and non-contact type.

Temperature transmitter uses thermocouple and thermal resistance as temperature measuring elementAfter measurement, the output signal is sent to the transmitter after voltage stability filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse

Temperature sensor transmitter is a combination of temperature sensor and temperature transmitter.

read more about Temperature sensor transmitter

The Function Of The Temperature Transmitter

A temperature transmitter is an instrument that converts a temperature variable into a standard output signal that can be transmitted.Mainly used for the measurement and control of temperature parameters in industrial processes.
The temperature current transmitter converts the signal of the temperature sensor into a current signal, and connects it to an auxiliary instrument to display the corresponding temperature.

Advantage Analysis

High precision
The range and zero point can be continuously adjusted from the outside
Good stability
Positive mobility can reach 500%, negative mobility can reach 600%
Two-wire system, three-wire system, four-wire system
Adjustable damping, overvoltage resistance
Solid state sensor design
No mechanical moving parts, less maintenance
Light weight (2.4kg)
Full series of unified structure, strong interchangeability
Miniaturization (total height 166mm)
The diaphragm material contact medium is optional
Unilateral overpressure
Low-pressure casting aluminum alloy shell
Superior measurement performance, used for pressure, differential pressure, liquid level, flow measurement

Technical Parameter

1. input
Thermocouple: (two wire system), voltage: connect cable:sensor lead, maximum impedance 1.5k
Thermal resistance: (three wire system, four wire system), resistance measurement: connect cable: resistance compensation can reach 50.
2.output Isolated voltage 0.5kV instead of 2.5KV
3.Transmitter input options, accuracy and environmental temperature impact.

How Does A Thermocouple Transmitter Work?

Thermocouple or thermal resistance sensor will be converted into electrical signal by the temperature and then, the signal is sent to the input network of the transmitter which is consisted of zero adjustment circuit, a thermocouple compensation circuit and other related circuits. The signal after zero adjustment will be input to the operational amplifier for signal amplification. The signal after amplification will be output as 4 ~ 20mA DC after being processed by the V/I converter in one way; in another way, it will be displayed in gauge outfit after being processed by A/D converter.

There are two kinds of linear circuit in the transmitter, both of which adopt the feedback mode. The thermal resistance sensor is corrected by the positive feedback mode while the thermocouple sensor is corrected by approximation method of multiple-segment line. There are two kinds of display modes for the temperature transmitter of integrated digital display. The temperature transmitter displayed by LCD is output by the two-wire system while the temperature transmitter displayed by LED is output by the three-wire system.

Bimetal sensor：The bimetal consists of two pieces of metal with different expansion coefficients glued together. As temperature changes, material A will expand more than other metals, causing the metal plate to bend. The curvature of the bend can be converted into an output signal.
Bimetal rod and metal tube sensor：As the temperature rises, the length of the metal pipe (material A) increases,but the length of the unexpanded steel pipe (metal B) does not increase, so due to the change in position, the linear expansion of the metal pipe can be transmitted. Furthermore, this linear expansion can be converted into an output signal.
Sensor designed for liquid and gas deformation curve：When the temperature changes, the volume of liquid and gas will change accordingly.

Various types of structures can convert this expansion change into a position change, thereby generating a position change.

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Rocket

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External Ultrasonic Tank Level Sensor

Posted on July 28, 2020 by KimGuo11

The external ultrasonic tank level sensors is the first choice for measuring liquid level and material level on various industrial tanks.

The intelligent ultrasonic tank level sensor installs the ultrasonic probe directly under the tank when measuring. No need to open holes, easy to install. Does not affect on-site production. It can measure various toxic substances and pure liquids in high temperature and high pressure airtight containers. The instrument adopts explosion-proof design to meet explosion-proof requirements. The Internet of Things can be realized through GPRS and Wifi.

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

Request a Quote

Ultrasonic level Meters

Features of External Ultrasonic Tank Level Sensor

The probe is external, no need to open a hole to the container under test.. Really realize non-contact measurement.
It is suitable for accurate measurement of the liquid level of toxic, volatile, flammable, explosive, and highly corrosive liquid media in various closed containers.
The instrument has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area.
The instrument has built-in ASIC (Intelligent Ultrasonic Special Hardware Integrated Circuit), which makes the instrument small in size, stable and reliable in measurement results. It can be suitable for all kinds of liquids and containers to be tested, and it is easy to install on site without complicated on-site calibration.
The instrument has built-in various calibration functions such as automatic temperature correction and automatic fixed distance calibration. The measurement results are more accurate and reliable.
The instrument has complete functions, with RS485 output, 4-20mA output, and switch output.
Multiple power supply methods available
Backup and restore configuration parameters
The analog output can be adjusted arbitrarily
With digital filtering and echo recognition functions
Fixed interference filtering function can be manually set
Support Bluetooth, GPRS communication, GPS satellite positioning, etc. (Order to buy)
Support custom serial data format
Support custom main display interface
Support MiniSD card data collection (order option)

Extended reading: The Secret of Ultrasonic Level Measurement

Technical Parameter of External Ultrasonic Tank Level Sensor

Range	1m, 3m, 5m, 8m, 10m, 15m, 20m, 25m, 30m
Accuracy	±1mm-±0.3%FS
	different from the sensor, too thick tank wall, unstable pressure and temperature may affect accuracy
Display	Chinese and English large screen LCD, color screen TFT (optional)
Display resolution	1MM
Output	4～20mA (maximum load 350Ω), RS485, switch value, TF card, GPRS, GPS
Power supply	DC12-24V or AC220V
Shell material	cast aluminum
Protection level	IP65
Probe material	ABS
Installation method	direct magnetic adsorption or adhesive transfer sheet (ferromagnetic), then magnetic adsorption
Sensor outlet cable	with standard 10M (optional length, optional sensor cable sheath)
Dimensions	host 230X210X129/135X180X86
Electrical interface specification	M20X1.5
Diameter of threading hole	5-15mm
Material	Copper plating
Power inlet cable	10m (optional length)
Ambient temperature of the host	-20℃~+70℃
The ambient temperature of the ultrasonic probe	-40℃～+100℃
Humidity	15%～100% RH

Extended reading: Guide to Ultrasonic Level Transmitters

Application Industry:

Pharmaceutical manufacturing industry: liquid level control of reaction liquid in pipelines and storage tanks, etc.
Petrochemical industry: oil pipeline, internal liquid level control of storage tanks, etc.
Food industry: liquid level detection and monitoring projects in brewing, beverage, milk production, storage tanks, pipelines, etc.

Application Conditions:

Media Purity

the liquid cannot be filled with dense bubbles. A large amount of solids, such as crystals, cannot be suspended in the liquid.The bottom of the container cannot deposit a large amount of sand and sediment.

Medium Viscosity

When the dynamic viscosity is less than 10mPaS, it is measured normally. When 10mPaS<dynamic viscosity<30mPaS, the range of the instrument may be reduced. It cannot be measured when the dynamic viscosity is >30mPaS.

note: As the temperature increases, the viscosity decreases, and most high-viscosity liquids are more affected by temperature. Therefore, pay attention to the effect of liquid temperature when measuring viscous liquids.

Container Under Test

Material: The container wall where the measuring probe is installed is required to be made of hard materials that can transmit signals well. Examples: carbon steel, stainless steel, various hard metals, glass steel, hard plastics, ceramics, glass, hard rubber and other materials or their composite materials. If the container wall where the measuring probe is installed is of multilayer material, the layers should be in close contact with no bubbles or gas interlayers. The inner and outer surfaces of the container wall should be flat. Examples: vulcanized hard rubber lining, stainless steel lining, titanium lining Floor.
Wall thickness: 1-100mm
Tank type: spherical tank, horizontal tank, vertical tank, etc.

Probe Installation Requirements:

For iron containers, you can apply silicone grease to the working end of the probe and stick it directly to the bottom of the container with a magnetic suction cup; if the container shell is made of glass or other materials, you can use glue to fix the probe or use a bracket to fix it. The bottom of the container. The probe point must be on the same straight line as the measured distance.
There are no obstructions such as coils directly above the probe;
Keep away from the liquid inlet at the bottom of the tank to avoid the influence of the violent flow of the liquid on the measurement;
Keep away from the position below the liquid inlet on the top of the tank to avoid the impact of the liquid inlet and the violent fluctuation of the liquid level to affect the measurement;
It is higher than the liquid outlet or the sewage outlet to avoid the influence of long-term deposits on the bottom of the tank on the measurement. If the conditions are not met, measures should be taken to ensure that the bottom of the tank is regularly removed;
When the liquid level measuring head is installed by magnetic or welding/adhesive fixing method, the installation surface size on the container wall should not be less than the round surface of Ф80, the surface roughness should reach 1.6, and the inclination should be less than 3°(bypass pipe exce

Technologies
Application
FAQ

What Is External Ultrasonic Tank Level Sensor?

Ultrasonic level meter is a high-tech product that integrates ultrasound, electronics and software. The various indicators of the ultrasonic level meter have reached the advanced level of similar products in the world. and it is the first-choice instrument for measuring liquid level and material level on various industrial sites.

How Do External Ultrasonic Tank Level Sensors Work?

Install the ultrasonic probe directly below the outer wall of the container under test. No need to open holes, easy to install, and does not affect on-site production. It can accurately measure various toxic substances and various pure liquids in high temperature and high pressure airtight containers.The instrument has built-in ASIC (Intelligent Ultrasonic Special Hardware Integrated Circuit), which makes the instrument small in size, stable and reliable in measurement results, and can be suitable for various liquids and containers to be tested. It is easy to install on site and does not require complex on-site calibration.

The instrument has built-in various calibration functions such as automatic temperature correction and automatic fixed distance calibration to make the measurement results more accurate and reliable. The Internet of Things can be realized through GPRS and Wifi.

How Do You Mount An External Ultrasonic Tank Level Sensor?

The probe is installed externally, no need to open a hole in the container to be tested, and truly realize non-contact measurement.It is suitable for accurate measurement of the liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers.The instrument has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area.

What Are The Benefits?

Safe : No valves, connecting pipes, joints, no leaks, no contact with the liquid and gas in the tank, very safe, when measuring toxic, corrosive, pressure, flammable, volatile, and easy to leak liquids
Hygiene: liquid level detection and monitoring projects in brewing, beverages, milk production, storage tanks, pipelines, etc. do not come in contact with liquids and cause pollution.
Convenient installation and maintenance: no fire or tank cleaning during installation and maintenance will not affect production.

When measuring the External Ultrasonic Tank Level Sensor, install the ultrasonic probe directly under the outer wall (bottom) of the container under test. No need to open holes, easy to install, and does not affect on-site production. It can be used to treat various toxic substances in high temperature and high pressure airtight containers. Accurate measurement of a pure liquid.

The External Ultrasonic Tank Level Sensor has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area. More about Top 5 Ultrasonic Level Sensor Applications.

In the design work, a reasonable and optimized External Ultrasonic Tank Level Sensor selection scheme was made according to each project. Judging from the production and application, the effect is very good.

1.Field application of butadiene

In a rubber project, it is necessary to measure the level of butadiene in the spherical tank. Butadiene is prone to self-polymerization to produce high molecular polymers, and the selection of ordinary liquid level meters is limited. According to the requirements of “Tank Area Automation System Design Regulations”, “Each pressure storage tank should be equipped with two sets of independent and different types of liquid level measuring instruments”. If the conventional contact liquid level gauge is selected for this project, butadiene is at the dead corner of the detection port The possibility of self-aggregation is very large, so the non-contact type should be given priority to the selection of the level gauge. Finally, a set of non-contact radar level gauges were installed on the top of the tank, and a set of External Ultrasonic Tank Level Sensors were installed on the bottom of the tank. After the field application, the externally attached ultrasonic level gauge measures accurately and the effect is very good.

2.Field application of liquid ammonia

In the design of a certain liquid ammonia spherical tank, the External Ultrasonic Tank Level Sensor also has a good application. The liquid ammonia in the storage tank is a colorless, pungent odor and toxic liquid, which is corrosive to a certain extent. Because the density of liquid ammonia is greatly affected by temperature, the differential pressure level gauge is not applicable in this project, and the external ultrasonic level gauge is finally used for detection.

3.Field application of high pressure storage tank

In a high-pressure hydrogenation plant, due to the unstable parameters of the original level gauge on the high-pressure storage tank, the owner wanted to add a level gauge to compare with it. However, the installation space of the high-pressure vessel was small on site, and the conditions for reopening were not available. After negotiation, it was decided to adopt an external ultrasonic level gauge, which not only avoided the economic loss caused by the shutdown of the device, but also prevented new pressure vessels. Increase the safety hazards of leakage points, simple installation, accurate and reliable, can be described as three birds with one stone.

4.Ultrasonic sensor for Oil/fuel level measurement

The External Ultrasonic Tank Level Sensor adopts explosion-proof design to meet explosion-proof requirements. The probe is installed externally, no need to open a hole in the container to be tested, real non-contact measurement, suitable for accurate liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers measuring. Therefore, the External Ultrasonic Tank Level Sensor is the best level measurement sensor for diesel, gasoline and other oil tanks. More about Diesel Fuel Level Sensor Types.

5. Other field applications

The External Ultrasonic Tank Level Sensor can be a good substitute for radar level gauges in some occasions where the dielectric constant is low, such as liquefied gas (dielectric constant <1.9) or the liquid surface contains a lot of bubbles and other radar level gauges are not suitable for use; For some highly corrosive acid and alkali storage tanks, such as liquid chlorine storage tanks, the External Ultrasonic Tank Level Sensor is also very useful.

External Ultrasonic Tank Level Sensor common available media include liquid chlorine, liquefied gas, liquid ammonia, ethylene, butadiene, gasoline, diesel, benzene, liquid bromine, hydrochloric acid, lye, nitric acid, methanol, vinyl chloride, hydrofluoric acid, ethylene Glycol, propane, naphtha, ethylene oxide, dimethyl ether.

Extended reading: ultrasonic level sensor for diesel tank

Can External Ultrasonic Tank Level Sensors Detect Water Level?

Ultrasonic liquid level sensor can be used for water level measurement. The principle of ultrasonic reflection used. According to the contact between the sound wave emitted by the pool ultrasonic liquid level gauge and the liquid surface. According to the length of time it reflects back. To measure the height of the liquid level in the tank.
Liquid level sensors are used in many sites to detect some conditions that require liquid level monitoring. It is well known that the liquid level of some sewage treatment tanks, the liquid level on the tank, the liquid level on the river channel and so on.

What is an ultrasonic level sensor?

Ultrasonic level sensor is a monitoring instrument for measuring liquid height, tank height, and material position.

Ultrasonic level sensor can adopt two-wire, three-wire or four-wire technology.

The two-wire system is: power supply and signal output are shared.
The three-wire system is: the power supply circuit and the signal output circuit are independent. When using DC 24v power supply, a 3-core cable can be used, and the negative terminal of the power supply and the negative terminal of the signal output share a core wire.
The four-wire system is: when using AC 220v power supply, or when using DC 24v power supply, when the power supply circuit and the signal output circuit are required to be completely isolated, a 4-core cable should be used.
DC or AC power supply, 4~20mADC, high and low switch output.

More about Ultrasonic Level Sensing Technology.

What are the different types of level sensors?

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

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

Related products and technologies

**Portable Ultrasonic Liquid Level Indicator**

**HS-ULC Ultrasonic Level Switch-External Mounted**

**HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller**

**ULT-100A Ultrasonic Level Transducer**

**ULT-200A Ultrasonic fuel tank level sensor**

**SIRD-905 Horn Antenna Radar Tank Level Sensor**

Positive Displacement Flow meter Technology

Posted on July 27, 2020 by KimGuo11

What is a Positive Displacement Flow meter?

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

Get a Quote

Volumetric Flow Meters

Positive Displacement Flow Meter Working Principle

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

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

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

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

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

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

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

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

Then V=Nu(1)

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

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

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

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

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

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

Positive displacement flow meter types Accuracy

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

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

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

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

Positive displacement flow meter types

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

**LCD display Oval Gear High Viscosity Flow Meter**

**High Temperature Oval Gear Flow Meter – Heating oil**

**Thermal insulation Oval Gear flow meter**

**Clamp Filling Oval Gear Positive Displacement Flow Meter**

Positive displacement flow meter advantages and disadvantages

Advantages

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

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

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

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

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

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

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

Disadvantages

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

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

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

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

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

Use and Maintenance

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

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

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

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

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

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

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

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

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

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

Positive displacement flow meter vs turbine

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

So is the turbine flowmeter a positive displacement flowmeter?

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

Ultrasonic Liquid Level Measurement

Posted on July 26, 2020 by KimGuo11

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

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

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

Featured Ultrasonic Level Sensors

Extended reading: Guide to Ultrasonic Level Transmitters

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

Image Source： https://www.coulton.com/beginners_guide_to_ultrasonic_level_transmitters.html

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

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

Water treatment industry.

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

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

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

Water conservancy and hydrology Water conservancy and hydrology industry.

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

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

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

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

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

The common channel width is more than 1 meter.

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

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

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

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

Advantages of ultrasonic level sensor:

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

Disadvantages of ultrasonic level sensor:

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

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

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

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

Extended Reading: Silo/Bin material level measurement system

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

Extended reading: Liquid mass flow controller

Liquid Level Measurement Using Ultrasonic Method

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

Common Applications for Ultrasonic Liquid Level Sensors

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

Extended reading: The Secret of Ultrasonic Level Measurement

Extended Reading: How to Measure Volume of Liquid

The Ultrasonic Liquid Level Measurement Also Has the Following Characteristics:

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

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

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Extended reading: Non-Contact Level Measurement

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

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

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

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KimGuo11

drurylandetheatre.com

MEMS Pressure Sensors

Posted on May 28, 2020 by KimGuo11

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.

Pressure Sensors

Featured MEMS Pressure Sensors

Industrial Pressure Sensor for OEM applications

Combined Pressure and Temperature Sensor-Dual function

Piezoresistive Differential Pressure 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

Range	Minimum range	DP	Range and sensor limit (kPa)	Minimum range	GP	Range and sensor limit (kPa)	Minimum range	AP	Range 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)
1	0.1	1	-1	/	/	/	/	/	/
2	0.2	5	-5	/	/	/	/	/	/
3	0.2	20	-20	0.2	20	-20	/	/	/
4	0.5	50	-50	0.5	50	-50	0.5	50	0
5	2	200	-200	2	200	-100	2	200	0
6	5	500	-500	5	500	-100	/	/	/
7	20	2000	-500	20	2000	-100	20	2000	0
8	100	10000	-500	100	10000	-100	100	10000	0
9	/	/	/	400	40000	-100	/	/	/

Measuring range of MEMS pressure sensor

Sensor type: German MEMS technology single crystal silicon sensor
Range ratio: 100: 01: 00
Accuracy grade: 0.075, 0.1, 0.2
Stability: 36 months error is ± 0.2% of maximum range
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 ℃ “
Output signal: “Two-wire system, 4 ～ 20mA DC, HAR T® protocol digital signal. Or four-wire system, RS485 output (MODBU S protocol)”
Metrology certification: CMC
Explosion-proof certification: “Explosion-proof type: Exd IIC T6 Gb
Intrinsically safe type: Exia IIC T6 Ga or Exib IIC T4 Gb “
Protection grade: IP67

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.

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

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.
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.
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

Help Center

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.

Magnetostrictive Level Sensor in Storage Tank Level Measurement

Posted on May 12, 2020 by KimGuo11

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

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

Featured Level Sensors for Tank Level Measurement

Rigid Probe Magnetostrictive Level Transmitter

Integral flange Magnetostrictive level sensor

Digital Display Magnetostrictive liquid level sensor

Comparison of the common detection methods for the Tank Level Measurement

Instrument name	Accuracy	Measuring principle	Liquid level, interface, temperature measurement	Regular maintenance	On-site installation	overall costs	Service life
Magnetostrictive liquid level sensor	0.5mm	Magnetostriction	Yes (integrated)	Maintenance-free	Simple	Low	20 years
Servo level sensor	1mm	mechanical	Yes (split)	Regular maintenance	Complicated	High	short
Guided wave radar level senosr	1mm	Radar	no	Maintenance	Complicated	High	Longer

Liquid level measurement methods for Tanks

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

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

Extended reading: Industrial Tank level indicators and Tank Level Gauges

Analysis and comparison with other level sensors

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

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

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

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

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

Extended reading: Hydrostatic Level Measurement

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

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

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

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

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

Extended reading: Radar Oil Tank Level Sensor

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

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

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

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

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

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

Extended reading: Types of Fuel-Diesel Level Sensors

What is tank level measurement

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

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

Tank level measurement devices

**SMT3151TR Submersible Level Transmitter**

Extended reading: ultrasonic level sensor for diesel tank

Tank level measurement using pressure

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

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

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

H = P / SG or P = SG? H

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

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

Radar tank level measurement

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

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

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

Radar Level Sensor Features

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

More about Radar level measurement

FAQ

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

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

How do I test my water level?

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

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

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

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

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KimGuo11

drurylandetheatre.com

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Pressure Measurement Sloutions

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1. Different measurement principles:

2. Requirements of the working pressure:

3. The influence of working temperature:

4. The difference of applicable media:

5. Requirements on the installation site:

6. The difference between display and signal output:

7. The problem of maintaining accuracy:

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Differential Pressure Level transmitter for Continuous tank level measurement.

A liquid level measurement solution that prevents the measured medium from directly acting on the transmitter.itle

Differential Pressure Level transmitter for open containers

Differential Pressure Level transmitter for closed containers

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Technical Parameter of External Ultrasonic Tank Level Sensor

Application Industry:

Application Conditions:

Media Purity

Medium Viscosity

Container Under Test

Probe Installation Requirements:

What Is External Ultrasonic Tank Level Sensor?

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Common Applications for Ultrasonic Liquid Level Sensors

Frequently
Asked
Questions

Frequently
Asked
Questions