Hydrostatic Level Measurement

Hydrostatic level measurement is often used for tank level measurement. Hydrostatic level measurement is one type of continuous level measurement.

Hydrostatic Level Measurement

What Is Hydrostatic Pressure?

Hydrostatic pressure sensors are used to measure the level or fill height of liquids. Hydrostatic pressure measurement is suitable for liquid level measurement due to the static pressure effect of non-flowing fluids. This physical principle describes the effect of the gravity of a stationary (i.e. non-flowing) liquid on the measurement point. This gravity is often described as “hydrostatic pressure”.

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

Select a Featured hydrostatic level sensor for your application 

SI-151 Hydrostatic Level Sensor
Hydrostatic Level Sensor (Best Price), also called Hydrostatic level transmitter. Continuous level measurement in liquid applications with pressure sensors.
SI-10 Liquid pressure sensor
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.
SI-PCM261 Submersible Pressure Transducer
Submersible pressure transducer with 4-20mA output,
is normal submersible pressure transmitter for level measurement.
SMT3151TR Submersible Level Transmitter
Hydrostatic level transmitter is also called hydrostatic level gauge. The rod-type Hydrostatic level transmitter 4-20mADC standard signal output. Flange or threaded installation. Can withstand high temperatures up to 450 ℃.
SI-PCM260 Deep Well Water Level Sensor
Well water level sensor is to apply Hydrostatic Level Sensor to deep well. Well water level sensor submerged in deep well work together with submersible water pump. Range 300m ~ 1000m.
SI-302 Anti-corrosive Submersible Level Transmitter
Submersible Level Transmitter is made of Anti-corrosive all-tetrafluoroethylene(PTFE) material. It has high temperature resistance, corrosion resistance and anti-clogging.
Wireless Level Sensor – LoRa The Wireless Level Sensor upgrades the LoRa wireless transmission function based on the Hydrostatic Level transmitter. Measure water or oil level. 

Pressure Guided Submersible Level Transmitter
Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter. The sensor part and the signal processing circuit are inside the junction box. It is used for high temperature, corrosive liquid, sewage, etc. 

The above level sensors are Submersible Level Transmitters. According to your measurement needs, we can provide various customizations. For example: measuring range, installation method, output method, explosion-proof, lightning protection, anti-corrosion, etc.

If you cannot use a level probe, we recommend that you use a pressure level sensor.

Extended reading: sludge level measurement

Hydrostatic level measurement with Pressure Transmitters

Flange Mounted Differential Pressure Transmitter
Extended Diaphragm Seal DP Level Transmitter
Remote Seal Differential Pressure Transmitter
Differential pressure(DP) level transmitter

In open and closed tanks, there may be special conditions such as high temperature and corrosion. At this time, use a pressure or differential pressure transmitter, with flange, diaphragm, capillary, etc. We can achieve the static pressure measurement of the tank liquid level.

Pros & Cons of Hydrostatic level measurement system

About Hydrostatic level transmitter advantages and disadvantages, we do a simple analysis here. If you want to know more about the advantages and disadvantages of level transmitters. Please refer to Sino-Inst Level Transmitters.

Advantages

  • High measurement accuracy;
  • The ultra-high range can be customized up to 1000 meters.
  • Easy to install;
  • The signal can be transmitted remotely;
  • The corrosion of various media can be resisted by choosing different materials;
  • Suitable for explosion-proof occasions;
  • Low cost;

Disadvantages

  • The measurement signal needs to be converted;
  • When the measuring range is greater than 5 meters, it is impossible to measure the high temperature medium temperature exceeding 125 ℃;
  • The density of the measuring medium must be uniform.

Hydrostatic level sensor installation guide

  1. If you choose a submersible pressure transmitter. You must lower the device into the medium by cable. Until you reach the bottom of the tank, reservoir or underground resources, or until you reach the required zero level. Then, run the cable from the oil tank or water tank to the control system. Connect the level probe to the PLC accordingly.
  2. If you have turbulent media, you should use an extra tank weight to stabilize the level probe in the media. To obtain a stable pressure reading. To prevent the cable from any mechanical damage. You can use the cable clamp to fix the cable on the top of the water tank. Or when connecting the cable to the control system.
  3. If you choose a standard pressure transmitter. Simply screw the transmitter into the threaded hole on the bottom or side of the tank. Then, connect the transmitter to the PLC with the appropriate cable connector. Or if cable connection is selected, connect the transmitter directly to the control system.

Hydrostatic level sensor can also be used with paperless recorder.

Capacitive vs Hydrostatic level sensor

Capacitive liquid level transmitter is the core sensor working principle of a transmitter. Refers to an instrument that measures differential pressure by detecting changes in capacitance on both sides of the sensing diaphragm. Theoretically, it can measure the pressure and differential pressure in any form, including liquid level. The reason why it is called a liquid level transmitter is only because its installation method is specially designed for liquid level measurement. The essence of the capacitive liquid level transmitter is a differential pressure transmitter.

Hydrostatic level sensor refers to a method of measuring liquid level using the principle of Hydrostatic pressure. Liquid level height × medium weight = pressure difference between liquid level and upside. This method of measurement requires the use of a differential pressure transmitter. If this differential pressure transmitter is designed to be more suitable for liquid level measurement, it is called a liquid level transmitter.

Extended reading: Hydrostatic Pressure Transmitter

Frequently
Asked
Questions

submersible pressure transducer or a flush pressure sensor measures the height-dependent weight-force of the liquid column, also known as hydrostatic pressure.
This pressure measurement is directly proportional to the liquid level respectively liquid column, at the measuring point of the pressure sensor.
It is, therefore, necessary, for the measurement of level, that the pressure sensor is placed as close as possible to the level of the vessel’s bottom.
The measured hydrostatic pressure then directly corresponds to the height of the liquid column, from the ground-level measurement point to the surface-level of the medium.
So, the filling height is calculated from the distance of the medium surface, to the measuring point by the pressure measurement.
The weight force of the liquid column, thus the hydrostatic pressure, however, is not only directly proportional to the filling height but also varies with the specific gravity of the medium and the force of gravity.
Read more about: Differences! Static pressure vs dynamic pressure vs total pressure

Hydrostatic pressure is the pressure that a homogeneous fluid acts on an object.
This is a omnidirectional force that is evenly applied to all parts of the surface of the object. Increased hydrostatic pressure will reduce the volume of the stressed object, but will not change its shape

Hydrostatic level transmitter is actually a type of pressure transmitter. Hydrostatic level transmitter is the application of pressure transmitter to liquid level measurement. The submersible Hydostatic pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Piezoresistive effect using diffused silicon or ceramic sensitive elements. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. In order to achieve liquid level measurement.

Usually we measure the liquid level by measuring the pressure.
When the liquid level transmitter is put into a certain depth in the measured liquid, the pressure formula of the sensor facing the liquid surface is: Ρ = ρ.g.H + Po. In the formula:
P: the pressure on the liquid face of the transmitter
Ρ: measured liquid density
G: local gravity acceleration
Po: atmospheric pressure on the liquid surface
H: Depth of transmitter into liquid
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel. Then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor. To offset Po on the back of the sensor, the pressure measured by the sensor is: ρ.g.H. Obviously, by measuring the pressure P, the liquid level depth can be obtained.
Of course, if the liquid level is measured, the pressure value can also be converted.
Read more What is a diaphragm seal?

Yes. If it is an open tank use a transmitter. If it is pressurized, 2 pressure transmitters must be used (the difference in the software is the liquid level height). The range unit of the transmitter is preferably mmH2O.
If the medium is not water, its density must also be known. This allows for span correction (top transmitters do not do span correction). Generally, a double-diaphragm differential pressure transmitter is used to detect the liquid level.

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Hydrostatic level sensor price

Compared with other liquid level transmitters, Hydrostatic level esnsor has lower cost. The price of Hydrostatic level sensor is mainly affected by the measurement situation. Such as:

  1. Range range;
  2. Medium temperature;
  3. The medium is corrosive;

Sino-Inst is a manufacturer of Hydrostatic level sesnor. Sino-Inst provides customers with the best Hydrostatic level measurement price. For example, the general-purpose Hydrostatic level transmitter has a reference price of USD70. If you want to know the exact price, please contact our sales engineer.

Sino-Instrument offers detailed product specifications and data sheets for review. Our application engineers, can help ensure you choose exactly what you need for your specific installation. Or if you need the RFQ instantly, we can offer you with the submersible level transmitter price immediately.

Extended Reading: bin level measuring system

Sino-Inst offers over 50 Hydrostatic level sensors at best price.

About 50% of these are Submersible Pressure Transducer, 40% are Differential Pressure Gauge, and 40% are Diaphragm Seal Pressure transmitters.
A wide variety of  Submersible Pressure Transducer options are available to you, such as free samples, paid samples. 

Sino-Inst is a globally recognized supplier and manufacturer of 
Submersible Pressure Transducer, located in China. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Submersible Pressure Transducer products are most popular in Domestic Market, Southeast Asia, and Mid East. 

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

Readd more about: [What is and How it Works]Hydrostatic Level Sensor

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SI-302 Anti-corrosive Submersible Level Transmitter

Submersible Level Transmitter is made of Anti-corrosive all-tetrafluoroethylene(PTFE) material. It has high temperature resistance, corrosion resistance and anti-clogging.

Submersible level transmitter made of PTFE is perfect in the harshest applications. Like Acid and alkali environment, Sludge and Slurries. Anti-corrosive Submersible Level Transmitter utilizes the linear change law of liquid height, density and pressure. It converts the change of liquid level into linear 4-20mADC standard signal output. Integrate temperature compensation calibration technology. Easy installation. Anti-corrosive Submersible Level Transmitter adopts two-wire system. 4 ~ 20mA output. 24V DC power supply. ATEX, 3 wire, remote mount transmitter optional.

Sino-Inst offers a variety of Submersible level transmitters with 4-20mA for industrial level measurement. If you have any questions, please contact our sales engineers.

Features of SI-302 Anti-corrosive Submersible Level Transmitter

  1. Corrosion resistance, high precision, low cost, high temperature resistance, anti-clogging;
  2. Convenient installation. Directly put the lowest point of the liquid level of the measured medium. Very convenient to use;
  3. Solid structure. No moving parts. High reliability. Long service life;
  4. Widely used to measure the liquid level of any liquid. Except for the medium corrosive to tetrafluoroethylene;
  5. From water, oil, acid, alkali, salt to paste with high viscosity can be measured with high accuracy. It is not affected by the foaming, deposition and electrical characteristics of the measured medium.
  6. With power supply reverse polarity and overload current limit protection.

Specifications of Submersible Level Transmitter

Measuring range:0~200m
Accuracy:0.5
Signal output:4~20ADC, 0~20mA
Loading resistance:0~600Ω
Transmitting distance:>1000m
Working voltage:24VDC
Working temperature:-50~ +80 °C;    -50~ +450 °C; 
Environmental temperature:-40~ +50 °C
Relative humidity:≤85%
Contacting liquid material:Stainless steel, PP, PTFE
Installation type:Flange: DN32 (HG/T20593,20595-97) RF sealing face ;  
G2″ thread(customize)
Electrical connection:M20×1.5
Explosion-proof grade:Exia II CT6Ga;   Exd II CT6Gb

Extended reading: sludge blanket level detector

Applications of Anti-corrosive Submersible Level Transmitter

Anti-corrosive Submersible Level Transmitter liquid contact material uses PTFE. Fully sealed welding of stainless steel shell. If customer needs, can be customized full PTFE material. Industry standard 4 ~ 20mA or 0 ~ 10mA signal output. Basically, no maintenance is required, and the wetted part is made of full PTFE material, which is extremely resistant to corrosion.

Anti-corrosive Submersible Level Transmitter is widely used in harshest applications such as Sludge and Slurries.

Product Applications:
Sulfuric acid, hydrochloric acid, hydrofluoric acid;
Corrosive liquids such as liquid alkali, xylene and acetone;
Wastewater;
Sludge pits, clarifiers, digesters;
Alum tanks;
Chemical storage tanks;
Oil tanks;
Lime slurry;
Sumps;
Reservoirs;

Extended reading: Applications of Radar Corrosive Liquid Chemical Level Sensor

How do Submersible Level Transmitters Work?

The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.

In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.

The formula P = ρgh reflects the proportional relationship between them.

Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.

Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.

The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.

More Submersible Pressure Transmitters for level measurement

Hydrostatic level transmitter-Rod Type
Submersible Pressure Transducer
Hydrostatic Level Sensor
Deep Well Water Level Sensor

Submersible Level Transmitter Calibration

Unscrew the protective cover and you will see the zero and full range resistors. External standard power supply and ammeter (above 0.2 level) can be adjusted. Proceed as follows:

  • When the transmitter has no liquid. Adjust the zero resistor to make the output current 4mA;
  • Transmitter is filled to full scale. Adjust the full range resistor to make it output current 20mA;
  • Repeat the above steps two or three times. Until the signal is normal;
  • The adjustment is completed. Tighten the protective cover.

Submersible Level Transmitter installation and precautions

The transmitter probe has an M20 × 1.5 interface, which can be screwed directly on the wall of the container or pipeline. Can also put the transmitter into the pool or other liquids. Cable lead to display instrument, secondary instrument or control room. Note that the cable part on the ground needs to be protected or elevated. If there is sediment at the bottom of the liquid to be tested. The transmitter should be raised or filtered for protection.

A. Instructions for installation of input liquid level sensor:

  1. Sludge and oil residue are easy to deposit on the bottom of the tank. It is recommended to move the measuring probe at a certain height away from the bottom of the tank (cabin). To avoid debris blocking the probe.
  2. When the medium in the tank fluctuates greatly and the air guide cable is very long. The probe should be fixed with a sleeve. To prevent the probe from swinging and affecting the measurement accuracy.
  3. When the transmitter is installed, the bending radius of the air guide cable should be greater than 10 cm. Avoid excessive bending to damage the air guide cable.
  4. The ground terminal of the input liquid level transmitter should be reliably grounded. The power shield should be connected to it.
  5. The installation direction of the transmitter is vertical. The installation position of the input type (probe) should be far away from the liquid inlet and outlet and the agitator.
  6. If the medium in the tank has large vibration, wire should be wrapped around the transmitter (probe). Use steel wire to reduce shock to avoid breaking the cable.

B. How to install the input liquid level sensor (probe) to prevent damage to the diaphragm?

When the Submersible Level Transmitter is installed in a stationary deep well or pool. Usually the steel pipe with inner diameter Φ45mm is fixed in water. Make small holes at different heights on the opposite side of the liquid flow direction, so that the medium can enter the tube smoothly. Then put the input liquid level transmitter into the steel pipe and use it.

Learn More About Submersible Level Transducer.

How to use Submersible Level Transmitter ?

  1. It is best to choose a regulated power supply to supply power separately. The stability of the power supply affects the performance index of the transmitter. It is best to control its error to less than one-fifth of the allowable error of the transmitter. For products with special power supply requirements, special power supplies must be connected.
  2. The signal cable of the liquid level transmitter should adopt shielded cable. Prevent electromagnetic interference.
  3. Connect the transmitter according to the correct wiring method. The power-on time should be between 15 and 30 minutes.
  4. If the liquid level transmitter is installed in the pool, water tower and other occasions. You can sink its probe underwater. Keep away from locations where the water velocity is too fast.
  5. In the installation of liquid level transmitters with large fluctuations such as submersible pumps, it is best to use the method of inserting steel pipes. The steel pipe should be fixed firmly. A hole should be made in the steel tube at every interval. The position of the steel pipe should be far away from the water inlet and outlet.
  6. The junction box should be fixed firmly. Or install a fixed bracket. It must be protected from dry and shaded places and must not be exposed to rain.
  7. Protect the ventilation cable. It must not be bent, blocked or damaged. Extra cables can be coiled nearby.
  8. The liquid level transmitter installed outdoors must also take lightning protection measures.

Submersible Level Transmitter for Wastewater

The wastewater treatment process involves many occasions where the liquid level needs to be measured. Also due to the characteristics of the sewage treatment process itself. Need to choose the appropriate level sensor according to the characteristics of each process and medium.

The sensor must be suitable for measuring sewage. The acid, alkali and small particles in the sewage have no effect on the measurement accuracy and life. The sensor has high measurement accuracy. Easy to install. Easy to adjust. The level gauge display is intuitive and has analog output and alarm output functions.

Generally speaking, magnetic float level sensor, ultrasonic level sensor and Submersible Level Transmitter can be used to measure the sewage level.

  1. The magnetic float level sensor is to convert the displacement of the magnetic float with the change of liquid level into a simulated linear standard signal output. The measurement accuracy can generally reach 1.5. When used for sewage measurement, the oil and suspended particles in the sewage will gradually adhere to the wall of the level gauge pipe. Over time, the amount of floating objects increases and the friction increases. The floating ball cannot rise and fall freely as the liquid level changes. It cannot be measured.
  2. The ultrasonic level sensor is based on the relationship between the distance from the ultrasonic probe to the surface of the measured object and the time. This type of liquid level gauge is almost not limited by the measured medium, but has a blind zone, which is suitable for the level measurement of the large “H” value of the storage silo. For the level measurement of sewage pits, due to the existence of blind areas, it has a greater impact on the accuracy of the measurement.
  3. Submersible Level Transmitter (cable static pressure liquid level transmitter) uses ceramic or diffused silicon sensors. The sensor goes directly into the measured liquid. The static pressure of the liquid medium directly acts on the sensor diaphragm. The static pressure is proportional to the height of the measured liquid. This level transmitter is small. Easy installation and low cost.

Compare the advantages and disadvantages of the above level gauges. Most customers will choose Submersible Level Transmitter.

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

FAQ

What is hydrostatic level sensor?

Hydrostatic pressure level sensor (Submersible Level Transmitter) is a pressure sensor that measures liquid level based on the principle of static pressure measurement. It can also be called “static pressure liquid level gauge, liquid level transmitter, liquid level sensor, water level sensor”

What is the water level sensor?

The water level sensor is an instrument that can convert the water level parameter of the measured point into the corresponding power signal in real time. It is mainly composed of a fully sealed isolation membrane oil-filled sensor and a built-in high-performance microprocessor.
There are many types of water level sensors. There are three common types of ultrasonic liquid level sensors, servo liquid level sensors and static pressure liquid level sensors. Due to the differences in their working principles and performance, their applications are also different.

What is ultrasonic level sensor?

The ultrasonic level sensor is a non-contact liquid level sensor. Ultrasonic sensors are sensors developed using the characteristics of ultrasound. Ultrasound is a mechanical wave with a vibration frequency higher than that of sound waves, which is generated by the vibration of the transducing wafer under the excitation of voltage. It has high frequency, short wavelength and small diffraction phenomenon. In particular, it has good directivity, and can be ray and directional propagation. Ultrasound has a great ability to penetrate liquids and solids. Especially in the opaque solids of sunlight, it can penetrate a depth of tens of meters.

Sino-Inst offers over 10 Submersible Level Transmitters. About 50% of these are Submersible Level Sensors, 40% are water level meters, and 40% are liquid treatment.
A wide variety of Submersible Level Transmitter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Submersible Level Transmitter, located in China.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.
Submersible Level Transmitter products are most popular in Domestic Market, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers with ISO9001,ISO14001 certification.

Request a Quote

Please enable JavaScript in your browser to submit the form

Remote Seal Differential Pressure Transmitter

Remote seal differential pressure transmitter is used to prevent medium from entering transmitter. The pressure sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is used to measure the level, flow and pressure of fluids, gases or steam.

Remote Seal Differential Pressure Transmitter is often used as a tank level transmitter. The smart pressure transmitter is connected with a stainless steel flange by capillary. The pressure is sensed by a remote transmission device installed on a pipe or container. The pressure is transmitted to the body of the transmitter through the filling silicone oil in the capillary. Then The delta chamber and the amplifying circuit board in the main body of 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.

Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.

Features of Remote Seal Differential Pressure Transmitter

  1. Simulate the “online operation” assessment one by one. Ensure that the transmitter works stably and reliably under the extreme ambient temperature, medium temperature and working pressure (including positive pressure or vacuum).
  2. Adopt “dynamic profile” remote transmission diaphragm structure. The diaphragm will not be damaged after overload. The accuracy will not change after long-term work.
  3. The filling system with full fusion welding and rigid sealing structure is selected to eliminate the occurrence of oil leakage.
  4. Novelly designed capillary coupling parts. Capillary is reliably protected. It is not easy to break when used on site.
  5. Variety, form and size of remote transmission device. And a variety of filling liquid types. It can meet the measurement needs of various occasions.
  6. Various special products can be provided. Including high temperature, high vacuum, fast response and unequal length capillary (length ≤ 3 meters) remote transmission pressure transmitter

Specifications of Remote Seal Differential Pressure Transmitter

Output signal:4 ~ 20MA. DC two-wire system (analog) superimposes the digital signal on the two-wire 4 ~ 20mA DC signal, and the user selects linear or square root output.
Power supply:12 ~ 45V.DC;
Load characteristics:
Power supply impact: <0.005% output range / V;
Load effect: when the power supply is stable, there is no load effect;
Measurement accuracy: ± 0.1% of the adjustment range, ± 0.2% standard accuracy is ± 0.2%, if other accuracy is selected, please indicate when ordering and selecting;
Range ratio: 10: 1 or 100 to 1;
Resistance: usually adjustable from 0.1 to 16 seconds, when inert liquid is filled or with a remote transmission device, the time constant will increase;
Startup time: <2 seconds, no warm-up is required.

Working environment:
ambient temperature -29 ~ 93 ℃ (analog amplifier);
29 ~ 75 ℃ (digital / smart amplifier);
-29 ~ 65 ℃ (with display meter);
Ambient humidity 0 ~ 95%.
Protection characteristics:protection ability IP65;
Explosion-proof type: Flameproof Ex d II BT4-6;
Intrinsically safe Exia II CT5.
The effect of static pressure: Zero error: ± 0.5% zui large range limit, for 32MPa under pipeline pressure by zero adjustments.
Electromagnetic radiation effect:0.05% large range value, receiving radiation frequency 27 ~ 500MHz, test field strength 3V / m.
Indication table (%):LCD digital display accuracy ± 0.2%.
Vibration effect:± 200% / g when vibrating at 200Hz in any direction.
Installation position: The diaphragm is not installed vertically, and a zero error of less than 0.24KPa may occur, but it can be corrected by zero adjustment.
Weight: 3.9Kg (excluding accessories).

Note:
① The working pressure of the remote pressure transmitter also depends on the specifications of the selected flange.
② The working temperature of the remote transmission device is determined by the type of filling liquid selected.
③ The remote transmission pressure transmitter refers to the output change produced by the temperature of the remote transmission device on one side.
④ The effects of static pressure and temperature are measured during a large range.
⑤ The length of the capillary on the side of the GP remote pressure transmitter is generally 1.5 meters, and the length should not exceed 3 meters (special agreement is agreed).

Read more What is a diaphragm seal?

DP Remote Seal Pressure Transmitter with Diaphragm Seal Installation

Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.

There are the following types of remote transmission differential pressure / level transmitters:
1) PFW flat type remote transmission device
2) RTW thread installation type remote transmission device
3) EFW inserted barrel remote transmission device
4) RFW flange mounted remote transmission device
5) SCW hygienic remote transmission device

The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge and absolute pressure transmitters and liquid level transmitters.

We can learn more about 1199 remote diaphragm.

Read more about: Differential Pressure Transmitter Installation Guide

Applications of Remote Seal Differential Pressure Transmitter

Remote Seal Differential Pressure Transmitter is a pressure sensor assembly used to prevent the medium in the pipeline from directly entering the transmitter. It is connected to the transmitter by a capillary filled with fluid. It is used to measure the liquid level, flow rate and pressure of liquid, gas or steam. Then it is converted into 4 ~ 20mA DC signal output. The applicable media are as follows:

  1. Viscous medium at high temperature;
  2. Easily crystallized medium;
  3. Precipitation medium with solid particles or suspended matter;
  4. Strongly corrosive or highly toxic medium;
  5. It can eliminate the occurrence of leakage of the pressure guiding pipe and pollute the surrounding environment. It can be avoided when using the isolation liquid. Because of the unstable measurement signal.
  6. Continuously and accurately measure the interface and density;
  7. The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement results truly reflect the actual situation of process changes;
  8. Places with high sanitation requirements;
  9. Such as in the production of food, beverage and pharmaceutical industries. Not only does the transmitter contact with the media meet hygienic standards, but it should be easy to rinse to prevent cross-contamination of different batches of media.

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

Precautions for use:

In the use process, we should pay attention to consider the following situations:

  1. When measuring the liquid pressure, the installation location of the remote pressure transmitter should avoid the impact of the liquid (that is, the water hammer phenomenon). In order to prevent the sensor from being damaged by overpressure.
  2. When the remote pressure transmitter transmitter freezes in winter. The transmitter installed outdoors must take anti-freezing measures. Avoid expansion of liquid in the pressure port due to icing volume. Lead to sensor damage.
  3. When wiring, pass the cable through the waterproof connector (accessory) or the flexible tube and tighten the sealing nut. In order to prevent rainwater etc. from leaking into the transmitter housing through the cable.
  4. When the remote pressure transmitter is used to measure the liquid pressure. The pressure tap should be opened on the side of the process pipe. In order to avoid sedimentation and accumulation of slag.
  5. To prevent the flange liquid transmitter from contacting with corrosive or overheated media. It is also necessary to prevent scum from depositing in the duct;
  6. When measuring the pressure of the gas, the pressure port should be opened at the top of the process pipeline. And the flange level transmitter should also be installed in the upper part of the process pipeline. In order to quickly deposit the deposited liquid into the process pipeline.
  7. The remote pressure transmitter should pay attention to that the pressure guiding tube of the sensor should be installed in a place with small temperature fluctuation.
  8. When measuring the steam or other high temperature medium of the remote pressure transmitter, it is necessary to connect a condenser such as a buffer tube (coil tube). The operating temperature of the transmitter should not be exceeded.

Extended reading: Smart Differential Pressure Transmitter

Remote Seal Differential Pressure Transmitters Working Principle

What is a diaphragm seal?

Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument.

A diaphragm seal has two primary tasks:

  1. Separation of the measuring instrument from the process medium
  2. Transfer of the pressure to the measuring instrument

You may like: Diaphragm pressure gauge

What is remote seal?

The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.

What are the advantages of diaphragm seals?

Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.

How do diaphragm seals work?

Basically, diaphragm seals are used in all pressure measurement processes to avoid direct contact between the measuring instrument and the medium during this process.

In addition, if the measuring point cannot be installed or read because the measuring point is located in a hard-to-reach location, a diaphragm seal can also be used.

In both cases, the applied pressure is transferred to the measuring instrument through the system fill fluid in the diaphragm seal housing.

The diaphragm of the seal can be made of different materials, such as stainless steel, Hastelloy, Monel or tantalum. In addition, coatings with ECTFE, PFA or gold can also be used.

We can provide the best diaphragm seal design, materials, system fill fluid and accessories for each application. The combined configuration of the pressure measuring instrument and the diaphragm seal is mainly determined by the special application conditions of the diaphragm sealing system.

Diaphragm type level transmitter working principle

Smart differential pressure transmitters are often used to measure liquid level, flow rate, etc. Differential pressure transmitter cooperates with sealing diaphragm, capillary, etc.

The differential pressure type liquid level gauge uses the principle that when the liquid level in the container changes, the static pressure generated by the liquid column also changes accordingly, as shown in the figure.

For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then:
P = P3 + Hpg (3-11)
In the formula: p is the medium density; g is the acceleration of gravity.
From the formula ((3-1 “available:
△ P = P-P3 = Hpg (3-12)
Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.

When the container under test is open, the gas pressure is atmospheric pressure. The negative pressure chamber of the differential pressure gauge can be vented to the atmosphere. It is known that the pressure gauge can also be used to measure the liquid level at this time.

If the container is closed, you need to connect the negative pressure chamber of the differential pressure gauge to the gas phase of the container.

Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.

More

SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.

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In the case of open tanks or underground water wells, Hydrostatic pressure level transmitters are also suitable.

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

FAQ

What is remote seal pressure transmitter?

Remote Diaphragm seal pressure transmitter with capillary is used as a level transmitter. Diaphragm Seals also called chemical seals, are used in applications where pressure sensor requires isolation from the process media. These applications are corrosive, high temperature, clogged. Or must sanitary fluids to remain in the pipeline or container. The pressure of the liquid in the process does not affect the pressure sensor. Instead, it is applied to the remote seal. And through the capillary, hydraulic pressure is transmitted to the pressure sensor. Installing and filling the diaphragm seal, the impact on instrument performance will be minimized. More

What is remote seal for level transmitter?

Remote seals are commonly used to protect pressure-measuring instruments including pressure gauges, pressure transmitters, and switches from hot, viscous, contaminated, or corrosive media. As a result, they’re often used in refining, petrochemical, and chemical plants. More Remote Diaphragm Seal System Pressure Transmitters

What is differential pressure transmitter working principle?

The basic principle of a differential pressure transmitter is to divide a space into two chambers with sensitive elements. When introducing pressure into the two chambers respectively. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.
A differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter. Output standard signals (such as 4 ~ 20mA, 0 ~ 5V). Differential pressure transmitters are different from general pressure transmitters in that they have two pressure interfaces. Differential pressure transmitters are generally divided into positive pressure end and negative pressure end. In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure in the negative pressure section to measure.
Extended Reading: Liquid pressure sensor

What is diaphragm seal pressure transmitter?

Diaphragm seal pressure transmitter with flange direct mount is good for level measurement. Diaphragm seals, also known as chemical seals or flush seals. Diaphragm seals work with pressure transmitter, pressure gauges. To prevent process medium from entering into the pressure-sensing assembly. So, Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media. Diaphragm seal connection can work with the capillary, flange and manufold. Like remote seal pressure transmitter, DP level transmitter. More

Extended Diaphragm Seal DP Level Transmitter
Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.
Flange Mounted Differential Pressure Transmitter
Flange Mounted Differential Pressure Transmitter is also called single flange DP level transmitter. For liquid, gas or vapor pressure measurement.
Diaphragm Seal Pressure Transmitter
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used for pressure measurement.
Remote Diaphragm Seal Pressure Transmitter
Remote seal pressure transmitter, with capillary and diaphragm seal, remote mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media.



Extended Reading: Differential Pressure (DP) Flow Meters Technology

Sino-Instrument offers Remote Seal Differential Pressure Transmitters. A wide variety of Remote Seal Differential Pressure Transmitter options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide. Remote Seal Differential Pressure Transmitter products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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Extended Diaphragm Seal DP Level Transmitter

Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.

Extended Diaphragm Seal DP Level Transmitter is a field level transmitter that is directly mounted on a pipe or container. The isolation diaphragm is in direct contact with the liquid medium. There is no need to lead out the positive pressure side with a pressure pipe. Therefore, it can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion. Convert to 4 ~ 20mA. DC signal output.

The flanges are made of high-quality stainless steel materials such as 304 and 316. Wetted diaphragms are made of imported high-quality anti-corrosive materials such as 316L, Hastelloy C-276, Monel, and tantalum.

Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.

Features of Extended Diaphragm Seal Differential Pressure Transmitter

  • Simple structure: There are no movable or elastic elements. Therefore, the reliability is extremely high. The amount of maintenance is very small.
  • Easy installation: The built-in structure especially shows this feature. No special tools are required.
  • Convenient adjustment: The two potentiometers of zero position and range can carry out zero point migration or range change at will within the effective range of liquid level detection. The two adjustments do not affect each other.
  • Widely used: Suitable for liquid level measurement of high temperature and high pressure, strong corrosion and other media.

Specifications of Extended Diaphragm Seal Level Transmitter

Measuring range:can be customized within the range of -4-4MPa (-10-10KPa, 0-50KPa, etc.)
Output signal: 4 ~ 20MA.DC two-wire system (analog). Two-wire system 4 ~ 20mA DC signal is superimposed with digital signal. Linear or square root output is selected by the user. (Smart)
Power supply:12 ~ 45V.DC
Range ratio: 10: 1 or 100 to 1
Power supply impact: <0.005% output range / V
Load effect: When the power supply is stable, there is no load effect.
Measurement accuracy: 0.1% of the calibration range. Standard accuracy is 0.2%. If other accuracy is selected, please indicate when ordering and selecting.
Resistance: usually adjustable between 0.1 to 16 seconds. When filling with inert liquid or with a remote transmission device, the time constant will increase.
Startup time: <2 seconds, no warm-up required
Working environment: ambient temperature -29 ~ 93 ℃ (analog amplifier)
 -29 ~ 75 ℃ (digital / smart amplifier)
    -29 ~ 65 ℃ (with display head)
Environmental humidity: 0 ~ 95%
Protection characteristics: protection ability IP65
Explosion-proof type: Flameproof Exd II BT4-6. Intrinsically safe Exia II CT5
Static pressure effect:Zero point error (can be eliminated under static pressure)
Static pressure from 0 ~ 13.7MPa, ± 0.2% / 6.9MPa
 Static pressure exceeds 13.7MPa, ± 0.5% / 6.9MPa

Extended reading: Smart Differential Pressure Transmitter

Applications of Extended Diaphragm Seal DP Level Transmitter

Extended Diaphragm Seal DP Transmitter can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion and other media. Then convert it to 4-20mA. DC signal output

Mainly used for measurement in the following occasions:

  • Viscous medium at high temperature.
  • Easily crystallized medium.
  • Precipitated media with solid particles or suspended matter.
  • Strongly corrosive or highly toxic media.
  • It can eliminate the leakage of the pressure guiding pipe and pollute the surrounding environment. When the isolation liquid is used, the tedious work of frequently replenishing the isolation liquid due to the unstable measurement signal can be avoided.
  • Continuously and accurately measure the interface and density.
  • The remote transmission device can avoid the mixing of different instantaneous media, so that the measurement results truly reflect the actual situation of process changes.
  • Hygiene and cleaning requirements are high.
  • For example, in the production of food, beverage and pharmaceutical industries, not only the location of the transmitter in contact with the media must meet hygienic standards, but it should be easy to rinse.

You may like: Diaphragm pressure gauge

Extended Diaphragm Deal Application

Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. In diaphragm seal systems, the diaphragm of the diaphragm seal affects the separation of the instrument and the medium.

The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

For the implementation of demanding customer applications, there are a wide variety of designs, materials and system fill fluids available.

Applications

  • Aggressive, highly viscous, crystallising or hot media
  • Process industry
  • Thick-walled or insulated pipelines and vessels

Read more What is a diaphragm seal?

1199EFW Extended Diaphragm Seal

The specifications of commonly used Extended Diaphragm Seals are as follows:

DN50 (2 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB150120954819418
300LB165127954820818
600LB165127954832818
900LB215165954845826
PN1.6/1.0165125954818418
PN2.5/4.0165125954820418
PN6.4180135954826422

DN80 (3 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB1901521247420418
300LB2101681247425822
600LB2101681247438822
900LB2401911247454826
PN1.6/1.02001601247420818
PN2.5/4.02001601247424818
PN6.42151701247428822

DN100 (4 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB2301901558924418
300LB2552001558932822
600LB2752151558945826
900LB2902351558950833
PN1.6/1.02001801558920818
PN2.5/4.02001901558924822
PN6.42152001558928826

Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.

There are the following types of remote transmission differential pressure / level transmitters:
1) PFW flat type remote transmission device
2) RTW thread installation type remote transmission device
3) EFW inserted barrel remote transmission device
4) RFW flange mounted remote transmission device
5) SCW hygienic remote transmission device

The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge and absolute pressure transmitters and liquid level transmitters.

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

Diaphragm type level transmitter working principle

Smart differential pressure transmitters are often used to measure liquid level, flow rate, etc. Differential pressure transmitter cooperates with sealing diaphragm, capillary, etc.

The differential pressure type liquid level gauge uses the principle that when the liquid level in the container changes, the static pressure generated by the liquid column also changes accordingly, as shown in the figure.

For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then:

P = P3 + Hpg (3-11)

In the formula: p is the medium density; g is the acceleration of gravity.
From the formula ((3-1 “available:
△ P = P-P3 = Hpg (3-12)

Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.

When the container under test is open, the gas pressure is atmospheric pressure. The negative pressure chamber of the differential pressure gauge can be vented to the atmosphere. It is known that the pressure gauge can also be used to measure the liquid level at this time. If the container is closed, you need to connect the negative pressure chamber of the differential pressure gauge to the gas phase of the container.

Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.

More

SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.

More

SMT3151DP intelligent differential pressure transmitter uses advanced microprocessor technology and digital communication technology. The basic principle of differential pressure transmitter is: divide a space with sensitive elements (multi-purpose capsule) into two chambers. Introduce pressure into the two chambers separately. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.

Comparative analysis – 7 Tank Level Measurement Sensors

You may like: differential pressure transmitter working principle|Working Principle of pressure level transmittersdifferential pressure level transmitter working principle

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SI-801 Piezoresistive Differential Pressure Transmitter

Piezoresistive Differential Pressure Transmitter utilizes the piezoresistive effect of semiconductor silicon materials. Realize accurate measurement of differential pressure.

Piezoresistive Differential Pressure Transmitter uses integrated all-welded differential pressure measuring elements. Silicone oil is filled between the chip and the two corrugated diaphragms. This product utilizes the piezoresistive effect of semiconductor silicon materials. To achieve the conversion of differential pressure and electrical signals. The signal output from the Wheatstone bridge on the sensitive chip has a good linear relationship with the differential pressure. Therefore, accurate measurement of the measured differential pressure can be achieved. It is suitable for differential pressure measurement of various gases and liquids in petroleum, chemical.

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

Features of Piezoresistive Differential Pressure Transmitter

  • All stainless steel structure design;
  • Small size, light weight and easy installation;
  • Welded structure, fully sealed;
  • Enclosure protection grade IP65;
  • The sensor is a diffused silicon piezoresistive differential pressure sensor, stainless steel 316L isolation diaphragm;
  • After temperature compensation and aging screening, the performance is stable and reliable;
  • Connector type products can adjust the zero point and fullness externally;

Specifications of Piezoresistive Differential Pressure Transmitter

Range: 0 ~ 10KPa ~ 35MPa
Withstand voltage: three times the range value
Comprehensive accuracy: 0.2% FS, 0.5% FS
Input and output signals: 4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage: 24VDC (10-30VDC)
Medium temperature:-20 ~ 65 ℃
Ambient temperature:-20 ~ 65 ℃
Load resistance: Current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance: Greater than 2000MΩ (100VDC)
Sealing grade: IP65
Long-term stability:0.1% FS / year
Vibration effect: Within the mechanical vibration frequency 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical interface: Hessman connector ( Support customization)
Mechanical connection (thread interface): M20 × 1.5, G1 / 2

Dimensions

Applications

  • Flow measurement
  • Wastewater treatment
  • Wind Diff Pressure undermine
  • Water Diff Pressure at hydropower station
  • urban flood control and waterlogging prevention
  • Underwater engineering
  • Groundwater monitoring
  • Central air-conditioning terminal control
  • Watersaving Irrigation

Working Principle of Piezoresistive Differential Pressure Transmitter

The sensitive element of the piezoresistive differential pressure transmitter is a solid piezoresistive sensitive chip. Silicone oil is filled between the chip and the two corrugated diaphragms.

The measured differential pressure acts on the corrugated diaphragms at both ends. The differential pressure is transmitted to the sensitive chip through silicone oil. The sensitive chip is connected to the special amplifier circuit through the wire. It utilizes the piezoresistive effect of semiconductor silicon materials.

To achieve the conversion of differential pressure and electrical signals. The signal output from the Wheatstone bridge on the sensitive chip has a good linear relationship with the differential pressure.

Therefore, accurate measurement of the measured differential pressure can be achieved. It is used to measure the pressure difference of various gases and liquids. It is suitable for the measurement of differential pressure and water level difference of pipelines in petroleum and chemical industries.

Read more: Differential Pressure Transmitter Installation Guide

The Piezoresistive Effect

The so-called piezoresistive effect refers to the phenomenon that when the semiconductor is subjected to stress, the energy band changes due to the stress, the energy of the energy valley moves, and its resistivity changes.

It was discovered by C.S Smith in the 1954 test of the resistivity and stress change characteristics of silicon and germanium. Semiconductor piezoresistive sensors have been widely used in aviation, chemical, marine, power and medical sectors.

More about Piezoresistive effect From Wikipedia.

Strain pressure sensor VS piezoresistive pressure sensor

In principle, strain-type pressure sensors are caused by changes in the geometry (length or width) of the strained material caused by external pressure (or tension). This in turn causes the resistance of the material to change. The magnitude of the external force can be measured by detecting this resistance change.

Piezoresistive pressure sensors are usually semiconductor pressure sensitive materials. After the semiconductor piezoresistive sensor is subjected to external forces, its own geometry hardly changes. Instead, its lattice parameters change, affecting the width of the forbidden band. Even a very small change in the width of the forbidden band will cause a large change in carrier density. This eventually causes the resistivity of the material to change.

It can be seen that although both materials exhibit changes in resistance to changes in external force, the principles are different. In addition, the sensitivity of strain-type materials to external forces is much lower than that of semiconductor piezoresistive materials.

The sensitivity of the latter is about 100 times that of the former. The characteristics of strained materials are less affected by temperature. Semiconductor piezoresistive materials are sensitive to temperature.

Piezoresistive pressure sensor advantages and disadvantages

Advantages of piezoresistive pressure sensor:

  1. High frequency response, f0 can reach 1.5M;
  2. Small size and low power consumption;
  3. High sensitivity, good accuracy, can measure to 0.1% accuracy;
  4. No moving parts (the sensitive element is integrated with the conversion element).

Disadvantages of piezoresistive pressure sensor:

  1. Poor temperature characteristics;
  2. The process is complicated.

Techincal Support

Capacitive mems pressure sensor

A MEMS pressure sensor is a thin-film element. It deforms when subjected to pressure, and it can be measured using a strain gauge (piezoresistive sensing). It can also be measured by capacitively sensing the change in the distance between the two surfaces.

Capacitive pressure sensor is a pressure sensor that uses a capacitive sensing element to convert the measured pressure into an electrical output with a certain relationship. The characteristics are: low input energy, high dynamic response, small natural effect, good environmental adaptability.

Capacitive differential pressure sensor

Capacitive differential pressure sensor is filled with silicone oil in the left and right chambers of the measuring diaphragm. When the left and right isolation diaphragms are subjected to high pressure pH and low pressure pL respectively, the incompressibility and fluidity of the silicone oil can transmit the differential pressure Δp = pH-pL Measure the left and right sides of the diaphragm.

Because the measuring diaphragm is pre-tensioned before welding, it is very flat when the differential pressure Δp = 0. It makes the capacitances of the two capacitors on the left and right sides of the fixed plate are completely equal. That is, CH = CL. When there is a differential pressure effect, the measuring diaphragm deforms. That is, the moving electrode plate approaches the low voltage electrode plate. At the same time, it moves away from the high voltage measuring electrode plate. This makes the capacitance CH = CL.

More Featured Piezoresistive Pressure Sensor

What is a piezoresistive pressure sensor?

Piezoresistance pressure sensor (piezoresistance type transducer) is a kind of pressure sensor. Piezoresistive pressure sensors, also known as diffused silicon pressure sensors, refer to sensors made using the piezoresistive effect of single crystal silicon materials and integrated circuit technology. The single crystal silicon material is subjected to force. The resistivity changes. The electrical signal output proportional to the force change can be obtained through the measuring circuit. Piezoresistive sensors are used for the measurement and control of pressure, tension, pressure difference, and other physical quantities that can be transformed into changes in force. Such as liquid level, acceleration, weight, strain, flow rate, vacuum degree.

How does a piezoresistive pressure sensor work?

Working principle of piezoresistive pressure sensor:
It is the resistance change when the varistor is pressed. It is amplified by the amplifier and calibrated with standard pressure. The pressure can be detected. The performance of the piezoresistive pressure sensor mainly depends on the varistor (ie varistor), the amplifier circuit, and the calibration and aging process in production.

What do piezoresistive sensors measure?

Using the semiconductor piezoresistive effect, various types of piezoresistive sensors can be designed. The piezoresistive sensor has a small volume, a relatively simple structure, and high sensitivity. It can measure micro-pressures of more than ten micropascals, with good dynamic response. Good long-term stability, low hysteresis and creep. High frequency response, easy production, and low cost. Therefore, piezoresistive sensors have been widely used in measuring pressure, differential pressure, liquid level, acceleration and flow.

How do you test a pressure sensor?

There are 3 commonly used detection methods for pressure sensors. Hope it can help you.
1. Pressure test. The method of detection is to power the sensor. Use your mouth to blow the air hole of the pressure sensor. Use the voltage file of a multimeter to detect the voltage change at the output of the sensor. If the relative sensitivity of the pressure sensor is large, this amount of change will be significant. If there is no change at all, you need to use a pneumatic source to apply pressure.
Through the above method, you can basically detect the condition of a sensor. If accurate testing is required, a standard pressure source is required. Give pressure to the sensor, and calibrate the sensor according to the pressure and the change of the output signal. And when conditions permit, the temperature detection of relevant parameters.
2. Zero point detection. Use the voltage range of the multimeter to detect the zero output of the sensor under no pressure. This output is generally a voltage of mV level. If it exceeds the technical specifications of the sensor, it means that the zero deviation of the sensor is out of range.
3. Detection of bridges. It mainly detects whether the circuit of the sensor is correct. It is generally a Wheatstone full-bridge circuit. Use the ohm file of the multimeter. Measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output impedances of the pressure sensor. If the impedance is infinite, the bridge is disconnected. It means there is a problem with the sensor or the definition of the pin is not correct.

Sino-Instrument offers over 10 Piezoresistive Differential Pressure Transmitters. A wide variety of  Piezoresistive Differential Pressure Transmitter options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide. Piezoresistive Differential Pressure Transmitter products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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SI-338 Ceramic Pressure Sensor

Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base.

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

Sino-Inst is a manufacturer of Ceramic Pressure Sensor in China. Committed to the manufacture, sales and engineering support of Ceramic Pressure Sensos.

Features of Ceramic Pressure Sensor

  • Small volume
  • Light weight
  • Easy to install and use
  • Cost-effective and compact economy
  • 0-0.2MPa -…- 40MPa pressure range measurement
  • Multiple industry standard signal output options
  • Wiring method is connector or direct lead
  • Compact design, high cost performance
  • Various pressure interfaces can be selected

Specifications of Ceramic Pressure Sensor

Range0-0.2MPa-……-40MPa
Comprehensive accuracy0.5%FS、1.0%FS、2.0%FS
output signal4-20mA、0-5V、0.5-4.5V
Supply voltage+5VDC、+12VDC、+24VDC
Process connectionG1/4、G1/2、G1/8、M20*1.5、M14*1.5
Electrical connectionsWaterproof connector
Compensation temperature0-65 ° C (default)
Operating temperature-20-125°C
Safety overload150-200%
Extreme overload200-250%
Long-term stability1% FS / year
Response timeLess than 1ms
shell material304 stainless steel
Protection classIP67, IP65

Applications of Ceramic Pressure Sensor

  • Engine Fuel Pressure measurement
  • Refrigeration and Air Compressor
  • Hydraulic pressure controller
  • Petrochemical industry
  • HAVC System Application
  • Pressure meter
  • Laboratory equipment
  • Water pressure measurement
  • Saving water to irrigate
  • Liquid and Gas pressure measurement

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Ceramic pressure sensor working principle

The corrosion-resistant ceramic pressure transmitter has no liquid transfer. Pressure acts directly on the front surface of the ceramic diaphragm. Make the membrane slightly deformed. Thick film resistors are printed on the back of the ceramic diaphragm and connected to form a closed Wheatstone bridge.

Due to the piezoresistive effect of the varistor, the bridge generates a voltage signal that is highly linear and proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3 mV / V according to the different pressure ranges, which is compatible with strain gauge transmitters.

Through laser calibration, the transmitter has high temperature stability and time stability. The transmitter comes with temperature compensation of 0 ~ 70 ℃, and can directly contact most media.

Ceramic is a recognized material with high elasticity, corrosion resistance, wear resistance, shock resistance and vibration. The thermal stability of ceramics and its thick film resistance can make its operating temperature range as high as -40 to 135 ° C, and it has high accuracy and stability for measurement. The degree of electrical insulation is> 2kV, the output signal is strong, and the long-term stability is good.

Extended reading: Static pressure vs dynamic pressure vs total pressure

Ceramic Diaphragm Pressure Sensor

The ceramic Diaphragm pressure sensor is a ceramic piezoresistive pressure sensor refined by a thick ceramic process using a refined ceramic base. Overall dimension Φ18mm * 6.35mm. Ceramic is a recognized material with high elasticity, corrosion resistance, wear resistance, impact resistance and vibration.

The good thermal stability of the ceramic and the high-temperature sintering process of the thick film make the working temperature range of the ceramic pressure sensor up to -40 ~ 125 ℃. The ceramic’s high elasticity and creep resistance make the ceramic pressure sensor have good long-term stability. In addition, the corrosion resistance of ceramics makes it uniquely advantageous in the fields of refrigeration, chemicals and environmental protection.

Sensor characteristics

● Ceramic overload sensitive diaphragm
● Zero point, full range laser calibration
● Excellent anti-corrosion and anti-wear performance
● Anti-shock and anti-vibration
● High precision and high stability
● Wide operating temperature range
● Small size and easy packaging
● Environmental protection

Ceramic Capacitive Pressure Sensor

Ceramic capacitive sensors use the most advanced ceramic technology, thick film electronic technology, and SMT technology.

Compared with other current capacitive sensors, the ceramic capacitive sensor uses a dry ceramic capacitive sensor without intermediary liquid, thus obtaining superior technical performance.

  • High stability, better than 0.10oF “S. every year
  • The temperature drift is small, ± 0.150o / lOK.
  • It has strong anti-overload and impact capability, and the overload can reach several times to one hundred times of the measuring range. Even if the measuring element is directly hit with a hard object, it will not be damaged.
  • It can be applied to medium measurement in various occasions in many industries.

Piezoresistive Pressure Sensor

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

Low-Pressure Transducer
Combined Pressure and Temperature Sensor-Dual function
High Temperature Pressure Sensor
Ultra-High Pressure Senors

Frequently
Asked
Questions

The ceramic pressure sensor is mainly composed of three parts: ceramic ring, ceramic diaphragm and ceramic cover.

The ceramic diaphragm is used as a sensitive elastomer. It is made of 95% AL2O3 porcelain. It is required to be flat, uniform and dense, and its thickness and effective radius depend on the design range.

The ceramic ring is formed by hot die casting process at high temperature.

High temperature glass paste is used between the ceramic diaphragm and the ceramic ring. They are fired together by thick film printing and thermal firing techniques to create a force-sensitive cup-shaped elastomer with a perimeter support. That is, a rigid structure without creep should be produced in the peripheral fixed part of the ceramic.

On the upper surface of the ceramic diaphragm, that is, the bottom of the porcelain cup and tea set, the circuit of the sensor is made by thick film technology.

The circular groove in the lower part of the ceramic cover creates a corresponding gap between the cover and the diaphragm. Limits prevent rupture of the diaphragm due to excessive bending when overloaded, resulting in overload protection of the sensor.

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

The most widely used pressure sensors are:
Diffused silicon piezoresistive pressure sensor,
Ceramic Piezoresistive Pressure Sensors,
sputtered thin film pressure sensor,
capacitive pressure sensor,
High temperature sapphire pressure sensor.
But the most widely used is the piezoresistive pressure sensor. It has a very low price and high accuracy and better linearity characteristics.

A pressure sensor works by converting pressure into an analogue electrical signal.

The demand for pressure measuring instruments increased during the steam age. When pressure sensing technologies were first manufactured they were mechanical and used Bourdon tube gauges to move a needle and give a visual indication of pressure. Nowadays we measure pressure electronically using pressure transducers and pressure switches.

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Sino-Inst offers Ceramic Pressure Sensors. A wide variety of Ceramic Pressure Sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of Ceramic Pressure Sensors, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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SI-706 Combined Pressure and Temperature Sensor-Dual function

Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.

The Combined pressure-temperature sensor uses a special core. Thermocouple types are: J, K, E type or PT100 platinum resistance. Integrated structure of temperature and pressure. Measure the medium pressure and temperature at the same point at the same time. The combined pressure and temperature sensor has a built-in temperature / pressure sensor. The two outputs do not affect each other. Consuming the power of one sensor can complete the pressure and temperature measurement. Widely used in scientific research, military industry, petrochemical, electric power, metallurgical machinery and environmental protection fields. Such as oil well temperature and pressure measurement, diesel engine common rail temperature and pressure measurement, injection machinery temperature and pressure measurement.

Sino-Inst is a manufacturer of Combined Pressure and Temperature Sensor in China. Committed to the manufacture, sales and engineering support of Combined Pressure and Temperature Sensors.

Combined Oil pressure and temperature sensor Features

  • Use imported resistance strain gauge or diffused silicon pressure-sensitive chip. High-precision PT100 temperature sensor
  • Advanced placement technology. With zero point, full range compensation, temperature compensation;
  • High precision and high stability amplification integrated circuit;
  • Isolation diaphragm design. Integrated structure design. Impact resistance, fatigue resistance and high reliability;
  • Fully sealed welding structure. Protection grade reaches IP67;
  • Diversified pressure output signals. General analog output, digital RS485 / RS232 output, etc .;
  • The structure is small, and the minimum outer diameter can reach 26mm;

Specifications of Combined Pressure and Temperature Sensor

  • Range: 0-20, 30-600KPa, 1, 5, 10, 20, 50-100MPa
  • Comprehensive accuracy: 0.2% FS, 0.5% FS, 1.0% FS
  • Output signal: 4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
  • Temperature signal output: J, K, E type thermocouple or PT100 platinum resistance, digital temperature signal DS18B20
  • Power supply voltage: 24VDC (10-30VDC)
  • Medium temperature: -20 ~ 85 ~ 350 ℃
  • Ambient temperature: -20 ~ 85 ℃
  • Load resistance: current output type: max. 800Ω; voltage output type: greater than 50KΩ
  • Insulation resistance: greater than 2000MΩ / 50VDC
  • Sealing grade: IP65
  • Long-term stable performance: 0.1% FS / year
  • Vibration effect: within the mechanical vibration frequency of 20Hz ~ 1000Hz. The output change is less than 0.1% FS
  • Electrical interface: direct outlet or aviation connector outlet
  • Mechanical connection: G1 / 2-14, M20 × 1.5, etc. Other threads can be designed according to customer requirements

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

Applications of Combined Pressure and Temperature Sensor

  • Aerospace
  • Analytical Instruments
  • Hydraulics
  • Hydrogen (Consult factory for media compatibility)
  • Test Stands
  • HVAC
  • Alternative energy management
  • Engine Controls & Monitors

Why use a Dual Pressure and Temperature Sensor?

Temperature and pressure integrated dual-function type: pressure, temperature measurement. The main reason for using dual pressure and temperature sensors is to save space. It can be widely used in the occasions where pressure and temperature need to be measured simultaneously in industrial control detection.

The integrated temperature coefficient organically integrates the temperature sensing element (thermal resistance or thermocouple) with the signal conversion and amplification unit. Thermocouple types are: J, K, E type or PT100 platinum resistance. Integrated structure of temperature and pressure. Simultaneously measure the medium pressure and temperature at the same point. It is suitable for measuring the temperature of the medium while measuring the pressure.

Working principle of Pressure and Temperature sensor

Thermocouples or thermal resistance sensors convert the measured temperature into electrical signals. Then send the signal to the input network of the transmitter. The network contains related circuits such as zero adjustment and thermocouple compensation.

The signal after zero adjustment is input to the operational amplifier for signal amplification. The amplified signal is output with 4-20ma DC current after being calculated and processed by the v / i converter. The other channel is processed by the a / d converter and displayed on the meter header.

There are two types of transmitter linearization circuits, both of which use feedback. For the RTD sensor, use positive feedback to correct it. For the thermocouple sensor, the multi-section broken line approach method is used for correction.

Ultra-High Pressure Senors
Sanitary Pressure Transmitter
Flush diaphragm pressure sensor
Melt Pressure Sensors/Transducers – High Temperature

Sino-Inst offers pressure and temperature sensors. A wide variety of pressure and temperature sensor options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of pressure and temperature sensors, located in China.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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SI-512H High Temperature Pressure Sensor

High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.

High Temperature Pressure Sensors from Sino-Inst operate beyond standard 85°C to 125°C ranges, withstanding temperatures up to 800°C. These pressure sensor high temperature devices offer stable and repeatable output in various industries like test and measurement and downhole tool operations.

Engineers can easily calibrate these sensors due to their accurate performance over a wide temperature range. Choose between millivolt and amplified designs to find the ideal High Temperature Pressure Sensor for your needs, ensuring precise measurements and optimized efficiency in demanding conditions.

Sino-Inst is a manufacturer of high temperature pressure sensors in China. Committed to the manufacture, sales and engineering support of high temperature pressure sensors.

Features of High Temperature Pressure Sensor

  • High temperature -40 ℃ ~ 200 ℃; -40 ℃ ~ 400 ℃; -40 ℃ ~ 600 ℃; -40 ℃ ~ 800 ℃
  • Stainless steel integrated structure can adapt to harsh environments
  • Small size, high accuracy, high cost performance, high stability
  • -100KP ~ 0 ~ 100MPA
  • Various standard signal output options, convenient for user debugging
  • Lightning protection, electromagnetic / radio frequency interference resistance
  • Wide power supply range (5 ~ 40V)
  • With zero point, full scale adjustable
  • SS304 stainless steel housing structure

Extended Reading: What is a MEMS pressure sensor?

Specifications of High Temperature Pressure Sensor

  • Range: -100KPa ~ 0 ~ 100MPa optional
  • Accuracy: ± 0.5% FS (composite error including non-linear repeatability hysteresis)
  • Output signal: 4 ~ 20mADC (two-wire system), 0 ~ 10mADC, 0 ~ 20mADC, 0.5 ~ 4.5VDC, 0 ~ 5VDC, 1 ~ 5VDC, 0 ~ 10VDC (three wire system)
  • Power supply voltage: 5 ~ 40VDC (two-wire system), 15 ~ 40VDC (three-wire system)
  • Medium temperature: -40 ℃ ~ 200 ℃ -40 ℃ ~ 400 ℃ -40 ℃ ~ 600 ℃ -40 ℃ ~ 800 ℃
  • Ambient temperature: -30 ℃ ~ 105 ℃
  • Pressure connection: M20 * 1.5 M22 * 1.5 M16 * 1.5 M11 * 1 NPT1 / 4 NTP1 / 2 NTP3 / 8 G1 / 8 G1 / 2 G1 / 4 G3 / 8,1 / 2-20UNF, etc. Other threads can be according to customer requirements design
  • Zero temperature drift: ≤ ± 0.02% FS ℃
  • Range temperature drift: ≤ ± 0.02% FS ℃
  • Compensation temperature: 0 ~ 80 ℃
  • Safety overload: 150% FS ℃
  • Ultimate overload: 200% FS ℃
  • Response time: 5 mS (up to 90% FS)
  • Vibration effect: The frequency is 10 ~ 100KHZ, the acceleration is 10g, all the effects are less than ± 0.1% FS
  • Test medium: Various liquids and gases compatible with 17-4PH stainless steel
  • Housing material: 304 or 316 stainless steel
  • Electrical connection: Hessman 3009 connector

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

Applications of High Temperature Pressure Sensor

High Temperature Pressure Sensor is used in industrial fields such as water plants, oil refineries, sewage treatment plants, building materials, light industry, machinery, etc. to achieve the measurement of liquid, gas and vapor pressure.

Application examples:

  • Industrial field process pressure detection
  • Laboratory pressure calibration system
  • Nautical and shipbuilding
  • Aviation and aircraft manufacturing.
  • Air separation equipment and thermal power units

Extended reading: High Pressure Flow Meters for Liquids-Steam-Gas

Cooling Element

Can pressure transmitters measure high temperature media?

Customers often have such a question. So can pressure transmitters really measure high temperature media? The answer is yes.Of course, the pressure transmitter cannot directly contact the high-temperature medium. Prolonged contact with high-temperature media can easily damage the pressure sensor. Usually when measuring high temperature media, the pressure transmitter will be equipped with a stainless steel heat sink device. Avoid direct contact between the medium and the transmitter. A condensing tube can also be added on the basis of the heat sink to reduce the damage to the transmitter caused by excessive temperature.

Read more about: What is industrial pressure transmitter?

High temperature-resistant pressure transmitters use Hessman connectors to keep the signal stable, the circuit design is constantly optimized, and the anti-interference ability is strong. The heat sink and core are fully combined to work normally at high temperatures.

High temperature-resistant pressure transmitter:

  1. Adding stainless steel heat sink on the basis of standard type and industrial type is high temperature type product, divided into standard high temperature type and industrial high temperature type. 4 ~ 20mA output, voltage 0 ~ 5V / 1 ~ 5/0 ~ 10V, etc.
  2. Standard high temperature type, all stainless steel structure, small size and easy installation. High temperature industrial type, cast aluminum housing, terminal output and simple wiring. When the current output is required, a digital display meter can be optionally provided.
  3. Standard high temperature type, high temperature industrial type, optional intrinsically safe explosion-proof box isolation and explosion-proof.
  4. The computer compensation technology is adopted, and the temperature drift is small. ± 0.01% FS / ℃ integrated circuit, high precision, strong anti-interference ability.
  5. Applied in petroleum, chemical, steel, light industry, machinery and equipment, energy constant pressure variable frequency water supply and other industries pressure detection. When the temperature is quite high, a condenser tube or a condenser is still used.

Add-on High Temperature Adapter

Add-on High-Temperature Adapter can also be called a pressure buffer tube. The role is to cool the measured medium and smooth the pressure fluctuations. When the pressure of the liquid, steam, and condensable gas whose temperature is higher than 60 ℃ is detected, the source port of the pressure sensor installed locally shall have a ring-shaped condensation ring or a U-shaped condensation bend.

Add-on High-Temperature Adapter is mainly used in a high-temperature environments with permeable or saturated steam. Avoid direct contact with high-temperature fluid inside the pressure sensor.

Read more about: Steam pressure transmitter-Pressure measure on steam pipeline 

Pressure and Temperature Sensor-Dual function
Ceramic Pressure Sensor
Ultra-High Pressure Senors
Liquid pressure sensor

pressure sensor for steam

Pressure transmitters are used for steam metering and pipeline monitoring.

The temperature in the steam pipeline is generally relatively high. The low is more than one hundred degrees Celsius, and the high is two to three hundred degrees Celsius.

The start and stop of the valve will also cause the pressure in the pipeline to fluctuate.

Today we are going to talk to you about what to pay attention to when measuring the pressure of steam pipes?

When measuring the pressure of the steam pipeline, a high-temperature pressure transmitter should be selected due to the high-temperature environment.

In fact, in steam conditions, it only needs to pass through the surface bend (condensation tube). After passing through the elbow, the steam will condense into water at the elbow. Insulate the temperature, so as to achieve a good cooling effect.

The pressure transmitter after passing through the elbow on the pipeline with insulation layer is basically at room temperature. If it is not insulated, the high temperature will rise, causing the temperature of all objects above the pipeline to rise.

Advantages: The use of bends can optimize the cost, and is compatible with the product.

The material selection of a good bend is high. It is thicker and more durable than the general watch bend on the market. Good pressure resistance. The price will be slightly more expensive.

Extended Reading: FMCW Radar for High Temperature Level Sensor

The above-mentioned pressure transmitter diaphragm damage is due to the phenomenon of water hammer.

The valve suddenly opens or closes, causing the pressure in the steam pipe to fluctuate suddenly.

Especially when the valve is opened, huge pressure fluctuations will cause the pipeline to vibrate violently. Even shocking.

The pressure transmitter will also withstand huge pressure in the pipeline. In severe cases, the core may be dented or even burst.

The prevention method is to install safety valves and accumulators, and open and close the valves slowly. Install a trap at the high point of the air discharge valve at the low point.

Some pressure transmitters will be protected by dampers and baffles.

The damper is a copper piece with a 4mm outer wire and a T-shaped thin through-tube structure inside. It can prevent the medium from directly impacting the diaphragm.

The baffle is placed on the front end of the core before assembling the core. Metal plate with holes. It also prevents the medium from directly impacting the diaphragm.

In the hydraulic machinery industry, there are a lot of equipment for pressure transmitters, which are often used for pressure control.

But hydraulic machinery is very prone to pressure shock when it is working. The shock pressure will far exceed the normal pressure, causing damage to the pressure transmitter.

In this case, some pressure transmitters have internal wires and dampers in the standard pressure port. Can effectively alleviate the impact.

The hydraulic and mechanical pressures are all above 10MPa. Generally, the transmitter above 10MPa should be equipped with a damper as standard. If the pressure shock is severe, a baffle can be added to alleviate the shock.

Extended Reading: Electronic Pressure Switch for Air Compressor

Frequently
Asked
Questions

A high pressure sensor is a device that converts the measured electrical parameters into DC current, DC voltage and isolates and outputs analog or digital signals.

The high pressure sensor usually adopts the selected foreign patch technology. The working principle is that the pressure of the measured pressure acts directly on the sensing piece of the sensor. The sensing piece produces a micro-displacement proportional to the pressure, and the resistance value of the sensor changes. And use the electronic circuit to detect this change. And convert and output a standard measurement signal corresponding to the pressure.

High temperature sensor is a kind of pressure sensor commonly used in industrial practice. It is widely used in various industrial automatic control environments.

The working principle of the high temperature sensor: the pressure of the wind pressure sensor acts directly on the diaphragm of the sensor. The diaphragm produces a micro-displacement proportional to the pressure of the medium. The resistance of the sensor changes. And the electronic circuit is used to detect this change. And The conversion outputs a standard signal corresponding to this pressure.

Extended reading: High Temperature Flow Meter

In HVAC systems, end sensors and controllers are the key components to ensure the smooth operation of the entire system and achieve energy-saving effects.

In the central air conditioner, the filter is used to filter the dust and impurities in the ventilation duct. The pressure sensor at the indoor vent is used to monitor the air pressure difference between the two ends of the filter at the air outlet. With the accumulation of time, the dust on the filter will accumulate more and more. It will gradually affect the air circulation of the filter. When the air circulation is not smooth, the air pressure difference between the two ends of the filter will continue to increase.

When the pressure sensor senses the pressure change, the upper computer receives the signal from the pressure sensor. When the signal value reaches the alarm point, it will start to alarm. It reminds the cleaning staff to replace or clean the filter. In addition to this role, the pressure sensor is also used to participate in the control of the air supply volume of the air outlet.

Extended reading: Miniature Pressure Switch

To measure pressure at high temperatures, you need a High Temperature Pressure Sensor designed to withstand extreme temperatures. These sensors typically use special materials and construction methods to ensure accurate and stable pressure readings even in environments with elevated temperatures.

Pressure sensor failures can result from several factors, including:

  • Overpressure: Exceeding the sensor’s rated pressure limit can cause permanent damage.
  • Temperature extremes: Prolonged exposure to temperatures outside the sensor’s specified range may cause sensor failure.
  • Mechanical stress: Physical damage, such as dropping or mishandling, can impact the sensor’s performance.
  • Corrosion: Exposure to harsh chemicals or corrosive substances can lead to sensor deterioration.
  • Electrical issues: Overvoltage, electromagnetic interference, or faulty wiring can damage the sensor’s electronics.

A pressure and temperature sensor is a combined device that measures both pressure and temperature in a single unit.

The pressure sensing element, usually a piezoresistive or capacitive element, converts the applied pressure into an electrical signal.

The temperature sensing element, often a thermocouple or RTD, measures the temperature by producing a voltage or resistance change proportional to temperature variations. The sensor’s output signals are then processed and converted into readable values.

A pressure sensor detects and measures the pressure of a fluid or gas. It converts the pressure into an electrical signal, which can be read and processed by control systems, instruments, or data acquisition devices. Pressure sensors can be used in various applications, such as monitoring pressure in pipelines, HVAC systems, automotive systems, and industrial processes.

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Sino-Inst offers high temperature Pressure Sensors/Transducers. A wide variety of  high temperature Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of high temperature Pressure sensors, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Request a Quote

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SI-PT series Melt Pressure Sensors/Transducers – High Temperature

Melt pressure transducers work for pressure measurement & control of melt under high temperature.

SI-PT series melt pressure sensors work for high temperature melt pressure measurement and control. SI-PT series high temperature melt pressure sensor has the advantages of high accuracy. Good stability. Large output signal. Good dynamics and strong versatility. Melt pressure sensors are widely used in: Gas pipe production lines. Plastic pipe production line. Geonet unit. Single corrugated pipe production line. Core layer foamed pipe production line. Plastic sheet (sheet) extrusion line. Polystyrene foam pipe production line. Film blowing unit, extrusion unit, PE stretch film unit, etc.

Sino-Inst’s also offers hazardous location melt pressure transducer just as you need.

Sino-Inst is a manufacturer of high temperature melt pressure sensors in China. Committed to the manufacture, sales and engineering support of high temperature melt pressure sensors.

Featured Melt Pressure Sensors/Transducers

ModelSI-PT 111 Melt Pressure Sensor
DescriptionPT111-series high temperature melt pressure sensor is mainly used for pressure measurement and control of molten materials under high temperature conditions.
FeaturesHigh accuracy.
Stable and reliable.
The output signal is large.
Good dynamic performance.
Strong versatility
Specifications1: Pressure range: 0 ~ 5MPa ~ 100MPa;
2: Accuracy: + 0.5% FS; + 1.0% FS;
3: Working power: 10VDC (6–12VDC);
4: Output signal: 0 ~ 5V; 0 ~ 10V; 4-20mA;
5: Calibration method: 80% FSO + 1%;
6: Probe temperature resistance: 300 ℃;
7: Temperature drift: ≤0.30Mpa / 100 ℃;
8: Electrical connection: universal five-core connector; military five-core connector;
9: Overload pressure: 1.5 * FS;
10: Mechanical connection: 1/2 “-20UNF, M14 * 1.5, M22 * 1.5, G3 / 4 and other multi-thread sizes;
11: Anti-corrosion and wear-resistant coating: suitable for pressure measurement of high-concentration rough media, which can increase the applicable life 3-5 times;
ApplicaitonsWidely used in petroleum, chemical fiber, plastic, rubber and other industries.
ModelSI-PT112 melt pressure transmitter
DescriptionPT112 series rigid rod high-precision pressure transmitter is mainly used for various occasions that require accurate data measurement. This product uses special material and alloy elastic diaphragm to reduce temperature drift and improve measurement accuracy. The zero full scale can be adjusted, and the amplified signal is directly input to the PLC, and the internal 80% calibration.
FeaturesHigh precision.
Stainless steel package.
Easy to install.
Can replace similar imported products.
80% internal alignment.
Good stability repeatability.
Specifications1. Measuring range: 0… 5MPa ~ 0… 200MPa
2. Comprehensive accuracy: ± 0.25% FS; ± 0.5% FS
3. Output signal: transmitter signal: 0 ~ 5V; 0 ~ 10V; 4-20mA; sensor signal: 2mV / V; 3.33mV / V
4. Power supply voltage: Transmitter: 24VDC (12 ~ 36) VDC; Sensor: 10VDC
5. Process connection: 1/2 ″ -20UNF, M14 × 1.5, M18 × 1.5, M22 × 1.5, G3 / 4 ″ optional
6. Electrical connection: 5 cores, 6 cores, optional
ApplicaitonsHigh temperature fluid media in chemical fiber spinning, polyester, and other equipment.
ModelSI-PT123 flexible high temperature melt pressure transducer
DescriptionPT123 flexible hose-type melt pressure sensor, which is equipped with a temperature sensor, can achieve the same point pressure and temperature measurement.
FeaturesHigh precision;
Stainless steel package;
Easy installation;
Can completely replace similar imported products;
80% internal calibration;
Good stability and repeatability
Specifications1. Measuring range: 0… 3.5MPa ~ 0… 150MPa
2. Comprehensive accuracy: ± 0.25% FS; ± 0.5% FS
3. Output signal: 2mV / V; 3.33mV / V
4. Power supply voltage: 10 (9 ~ 12V) DC
5. Process connection: 1/2 ″ -20UNF, M14 × 1.5, M18 × 1.5 (customer-defined)
6. Diaphragm temperature: 350 ℃ (* High 400 ℃)
7. Diaphragm material: 15-5PH coated stainless steel
8. Electrical connection: 5 core, 6 core
ApplicaitonsPressure measurement and control of high temperature fluid media in chemical fiber spinning, polyester and other equipment.
ModelSI-PT124 high temperature melt pressure sensor
DescriptionRigid rod, hose isolation, diaphragm isolation structure, PT124 high temperature melt pressure sensor can be completely interchangeable with similar products such as American Dynisco, GEFRAN, RKC.
FeaturesRigid rod, hose isolation, diaphragm isolation structure
Specifications1. Pressure range: optional within 0 ~ 5MPa ~ 200MPa;
2. Accuracy: + 0.25% FS; + 0.5% FS;
3. Input voltage: 10VDC (6–12VDC);
4. Output signal: 1.5mv / v, 2.0mV / V, 3.3mV / V;
5. Calibration method: 80% FSO + 1%;
6. Probe temperature resistance: 450 ℃;
7. Temperature drift: ≤0.30Mpa / 100 ℃;
8. Electrical connection: universal five-core connector;
9. Overload pressure: 1.5 * FS; high temperature melt pressure transmitter
10.Mechanical connection: 1/2 “-20UNF, M14 * 1.5, M18 * 1.5, M22 * 1.5, and other multi-thread sizes;
11. Anti-corrosion and wear-resistant coating: suitable for pressure measurement of high-concentration rough media, which can increase the applicable life 3-5 times;
ApplicaitonsPressure measurement and control of high temperature fluid media used in chemical fiber spinning, polyester, rubber and plastic machinery.

ModelSI-PT127 high temperature melt pressure sensor
DescriptionPT127 high temperature melt pressure sensor is mainly used in various occasions that require accurate data measurement. This product uses special material and alloy elastic diaphragm to reduce temperature drift and improve measurement accuracy.
FeaturesRigid rod, hose isolation, diaphragm isolation structure. Good stability and accuracy;
Specifications1. Range: 0 ~ 5 ~ 200MPa
2. Comprehensive accuracy: 0.5% FS; 1% FS
3. Output signal: 1.5mV / V; 2mV / V; 3.33mV / V 4. Power supply voltage: 10VDC
5. Temperature model: J, K, E, PT100
6. Diaphragm temperature resistance: 450 ℃
7. Electrical connection: 5-pin connector 5 pin
8. Process connection: M22 × 1.5; special design
ApplicaitonsMeasurement and control of pressure and temperature of high temperature fluid media of chemical fiber spinning, polyester, rubber and plastic machinery and other equipment.
ModelSI-PT131 high temperature melt pressure and temperature transducer
DescriptionPT131 has good stability and accuracy. It is completely interchangeable with similar products such as Dynisco, GEFRAN, RKC, etc.
FeaturesRigid rod, hose isolation, diaphragm isolation structure
Specifications1: Pressure range: optional within 0 ~ 5MPa ~ 200MPa
2: Accuracy: + 1.0% FS; + 0.5% FS;
3: working power: 10VDC (6–12VDC);
4: Output signal: PT131 series: 1.5mv / v, 2.0mV / V, 3.3mV / V
5: Calibration method: 80% FSO + 1%;
6: Probe temperature resistance: 450 ℃
7: Temperature Model: PT131 (E; J; K)
8: Electrical connection: PT131-series: universal seven-core connector
9: Overload pressure: 1.5 * FS
10: Mechanical connection: 1/2 “-20UNF, M14 * 1.5, M18 * 1.5, M22 * 1.5, etc.
11: Anti-corrosion and wear-resistant coating: suitable for pressure measurement of high-concentration rough media, which can increase the applicable life 3-5 times
ApplicaitonsPressure measurement and control of high temperature fluid media used in chemical fiber spinning, polyester, rubber and plastic machinery.
ModelSI-PT2616 flange high temperature melt pressure transmitter
DescriptionPT2616 flange high temperature melt pressure transmitter is a new pressure measuring transmitter launched by our company. It is used to measure high precision and pollution-free environment. The product combines the latest technology of the industry, using special elastic diaphragm and pressure Strain gauges. Greatly reduced measurement error, more stable and more wear-resistant.
FeaturesHigh precision, stainless steel material sealing, simple installation, good stability, zero degree full scale adjustable, linear output can be directly PLC, good working characteristics and explosion-proof.
Specifications1. Pressure measuring range: 0 ~ 5, 0 ~ 200Mpa
2. Accuracy: ≤ ± 0.5% full scale
3. Signal output: 1.5mv / v, 2.0mV / V, 3.3mV / V
4. Input voltage: 10VDC (6-12) VDC
5. Electrical connection: 6-pin universal aviation plug
6. Mechanical connection: flange connection, size can be customized
7. Diaphragm temperature resistance: 300 ℃
8. Overpressure: 1.5% full scale
ApplicaitonsThis product is suitable for measuring the pressure of high temperature melt and the measurement of melt of plastic, plastic, rubber, chemical fiber and other extruder and extruder.
ModelSI-PT292 explosion-proof high temperature melt pressure transducer
DescriptionThe PT292 series is an intelligent 4-20mA pressure transmitter designed for use in hazardous areas. PT292 high temperature melt pressure transducer type products have passed the Class 1, Division I, Groups A, B, C and D explosion-proof certification. Explosion-proof products include wire connections. Type PT292 is ATEX II 1 G 100a certified and Eex ia IIC 0 and 1 zone intrinsically safe. This intrinsically safe and ATEX version is available with either a connection wire connection or a 6-pin connection.
FeaturesConfigurable by hand;
Repeatable precision pressure measurement;
Direct output to DCS or PLC;
Users can precisely adjust the pressure range;
Certification for use in hazardous environments;
Meets new EC requirements
Specifications1. HARTTM Digital Communications
2. Comprehensive error better than ± 0.25%
3. 4-20mA loop-powered output
4. 0-500 to 0-30,000 psi
5. Ex, intrinsically safe or ATEX certified
ApplicaitonsPressure measurement and control of high temperature fluid media used in chemical fiber spinning, polyester, rubber and plastic machinery.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Working Principle of Melt Pressure Transducer

The working principle of the melt pressure sensor is that the pressure of the medium directly acts on the diaphragm of the sensor. The diaphragm produces a micro-displacement proportional to the pressure of the medium. The resistance of the sensor changes. The change is detected by electronic circuits. The conversion outputs a standard signal corresponding to this pressure.

Precautions for buying high temperature melt pressure sensors

1. What kind of pressure is being measured. Generally, the maximum pressure range of the high temperature melt pressure sensor you need should reach 1.5 times the maximum pressure value of your system. All high temperature melt pressure sensors are designed to withstand the maximum pressure for 200 million cycles without degrading performance. You need to find a compromise solution between system performance and high temperature melt pressure sensor life.

2. Consider the type of media that needs to be measured. The key factor to consider when selecting a high temperature melt pressure sensor is the medium being measured. Will it be a viscous liquid or a slurry on the pressure head? Is the contact with the high temperature melt pressure sensor a soluble or corrosive medium or clean dry air? This question determines whether impact dies are needed and what materials are used to make contact with the media.

3. Consider the accuracy you need to achieve. Accuracy is a term commonly used by manufacturers to describe the output error of high temperature melt pressure sensors. The cost of having a higher accuracy high temperature melt pressure sensor will be higher. Then your system really needs such high accuracy ? A system consisting of a high-precision high-temperature melt pressure sensor and a low-resolution instrument is actually a low-efficiency solution.

4. Carefully consider the temperature resistance, interchangeability, time stability and ruggedness of the high temperature melt pressure sensor to be purchased.

5. What output method does the high temperature melt pressure sensor you want to use. The required excitation voltage, and how to connect the high temperature melt pressure sensor to your electrical system.

Extended Reading: strain gauge pressure transducer

Use of high temperature melt pressure sensor

Installation

The correct installation position of the high temperature melt transmitter on the process pipeline is related to the measured medium. In order to obtain the best measurement results, pay attention to several points:

  1. Prevent the transmitter from coming into contact with corrosive or hot media;
  2. When measuring liquid pressure, the pressure taking port should be opened on the side of the process pipeline to avoid sedimentation;
  3. Prevent dross from depositing in the duct;
  4. When measuring the gas pressure, the pressure taking port should be opened at the top of the process pipeline, and the transmitter should also be installed at the top of the process pipeline so that the accumulated liquid can be easily injected into the process pipeline;
  5. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) must be connected, and the operating temperature of the transmitter should not exceed the limit;
  6. The pressure guiding tube should be installed in a place with small temperature fluctuations;
  7. When freezing occurs in winter, it is necessary to take anti-freezing measures according to the transmitter installed outdoors to avoid the expansion of the liquid in the pressure port due to the freezing volume, leading to damage to the sensor;
  8. When wiring, pass the cable through the waterproof joint or flexible pipe and tighten the sealing nut to prevent rainwater, etc. from leaking into the transmitter housing through the cable;
  9. When measuring the liquid pressure, the installation position of the transmitter should avoid the impact of the liquid to avoid damage to the sensor due to overpressure.

Maintenance

High temperature melt transmitters are required to be checked once a week. Check every month. It is mainly to remove dust from the instrument. Carefully inspect electrical components. Always check the output current value. There is weak current inside the pressure transmitter. Be sure to keep it away from strong external electricity.

extrusion melt pressure transducer

In plastic and rubber extrusion production lines, melt pressure sensors play an important role in improving melt quality, improving production safety and protecting production equipment. At the same time, the high temperature melt pressure sensor is a very sensitive element. Only proper installation and maintenance can make it work to its fullest.

In the extrusion production process, some quality standards of the product (such as dimensional accuracy or the surface flatness of the parts added with mineral fillers, etc.) require optimal control of the extrusion pressure. Melt pressure sensor is an important element to achieve this requirement. By setting the melt pressure sensor and pressure control device at the mold inlet connection. It can make the product more stable and can reduce the waste of materials.

In addition, measuring the pressure across the screen and the melt pump is very important to ensure the safety of production and the optimal performance of the equipment. If the flow of the melt into the mold is blocked, a sensor under the screen will alert the operator (which can be done via a meter) to alert the operator.

When a sensor upstream of the filter sounds an alarm, it indicates that the pressure inside the extruder is too high, possibly causing excessive wear on the screw.
For manufacturers applying melt pumps, it is necessary to measure the inlet and outlet pressures of the melt medium. To ensure that the melt medium can continuously flow into the mold. Because of any obstruction, the melt pump may be blocked.

A pressure sensor equipped on an extrusion line can measure the pressure at only one point, or it can be a series of sensors used to measure the entire line.
Melt pressure sensor is connected with data recorder and sound alarm device. The processing parameters of the extruder can be adjusted using the processing control system.

Common faults of high temperature melt pressure sensor digital instruments

  1. High temperature melt pressure gauge with black screen. Make a preliminary judgment as to whether the 220v power supply line is faulty. The pressure gauge may burn out.
  2. Word skip appears on the pressure gauge. Preliminarily judge whether the connection of the signal line between the sensor and the pressure instrument is bad; whether the shield line is connected to the ground. There are interference signals at the scene. (Poor contact between the welding points inside the meter).
  3. The upper window of the meter displays —- or 0000. The signal cable between the sensor and the meter may be connected incorrectly. Or the sensor leads are broken.
  4. The pressure display on the upper window of the meter does not rise but decreases, which may be the damage of the sensor diaphragm.
  5. The pressure gauge functions normally, that is, the pressure cannot reach the target value. Check the sensor threads. Installing too shallow or too deep may cause it. Adjusting the torque to the normal range pressure shows normal;
  6. The high temperature melt pressure gauge shows a negative number. Cannot clear calibration. The high-temperature melt pressure gauge is subjected to an instantaneous strong current shock, which causes damage to the instrument protection components.

More Featured Pressure Transmitters

Frequently
Asked
Questions

Melt pressure transducers are common spares on extrusion lines to measure the pressure and/or temperature of materials in pipes. The design structure of the product is to stick the four strain gauges that make up the bridge circuit on the diaphragm at the other end of the capillary tube according to the principle of circular diaphragm compression.
During measurement, the melt presses the pressure-sensitive diaphragm, which transmits the pressure to the diaphragm at the other end through the filling medium. The diaphragm is deformed, and the strain is attached to the strain gauge.

Before the calibration operation, first, the Melt pressure transducers are stopped, second, the operating temperature is within the operating temperature, and third, the temperature compensation is adjusted to zero.

Melt pressure transducers are available in temperature compensated grades, which are selected based on the medium filled in the capillary tube in the sensor. The physical properties of the filling medium are directly related to the zero degree output level.

When assigning ranges with the meter, this value needs to be taken into account and adjustments made to compensate. A calibration adjustment acts like setting a balance, think of temperature compensation as the packaging of the item being weighed.

The temperature compensation for 3 different media is as follows:

  • Hg (mercury) = 15 psi/ 100°F or 27 psi/ 100°C
  • Oil = 36 psi/100°F or 65psi/100°C
  • NaK (Sodium Potassium) = 30 psi/ 100°F or 54psi/ 100°C

Example:
Process temperature = 200°C, mercury filled, signal output 60psi @ zero pressure

① According to the full scale pressure range of the sensor, this offset is outside the normal combined error specification. The pressure range is 10,000 psi, the combined error is 0.5%, and the compensation is actually 110 psi.
② Remember that when we perform calibration, there is no change to the signal output, only to ensure that the output is within the tolerance range of the specification.
③The design of the meter is easy to process calibration, and it only takes a few cases to test the high/low limit range of the output.

A pressure transmitter refers to a pressure sensor whose output is a standard signal, and is an instrument that accepts a pressure variable proportionally converted into a standard output signal. It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals. Measurement, indication and process adjustment are carried out by supplying secondary instruments such as indicating alarms, recorders and regulators.

If you want the pressure transmitter to be washable, you should consider installing the pressure transmitter on the barrel before the filter or before and after the melt pump or in the mold.

Points to note when cleaning the pressure transmitter:

All pressure transmitter connections should be removed before cleaning the body with a wire brush or detergent. Because these two cleaning methods may damage the diaphragm of the pressure transmitter and the insulation of the wiring.

When heated cleaning is required, the pressure transmitter should also be removed and the top wiped with a soft, non-abrasive cloth. At the same time, the holes of the pressure transmitter also need to be cleaned with soft tools.

There are different types of pressure transducers based on their design.

These sensors can come in several shapes and sizes, but the technology inside can also differ. 

There 4 main types of pressure sensors based on this: 

More about Industrial Pressure Sensors

Extended Reading: Electronic Pressure Switch for Air Compressor

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Sino-Inst is Manufacturer of Melt Pressure Transducers. We supply more than 20 kinds of Melt Pressure Transducers. 90% Melt Pressure Transducers are used for precise measurement and control of high temperature such as rubber, plastic, chemical fiber, polyester nylon, polyester, steam, etc.

Sino-Inst’s high temperature Melt Pressure Transducers are used in the pressure measurement of high temperature melt, fluid and gas medium in chemical fiber spinning, polyester rubber, plastic rubber and plastic, extrusion machinery, non-woven non-woven, construction packaging materials and other equipment.

High temperature melt pressure sensor is used for pressure measurement and control of high temperature fluid medium in chemical fiber spinning, polyester, rubber and plastic machinery and other equipment.

Melt Pressure Transducers enable stable pressure measurement with high temperature. This greatly meets the measurement needs of many applications.

Sino-Inst’s Melt Pressure Transducers, made in China, Having good Quality, With better price. Our pressure measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

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

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SI-702S Ultra High pressure transducer

High pressure transducer is used to measure high pressure up to 1500Mpa. Also called ultra high pressure transducer.

High pressure transducer adopts ultra high pressure design. Suitable for high pressure applications up to 15000bar. SI-702S series ultra high pressure pressure transducer can provide reliable ultra-high pressure measurement. Ultra high pressure transmitter adopts rare metal alloy material. After special process treatment, integrated design. All stainless steel welding package. Laser resistance temperature compensation. With high performance digital processing circuit. The factory has undergone high and low temperature aging and long-term fatigue tests. Good long-term stability. Ultra-long working life. Maintain safe and stable operation in the ultra-high pressure range.

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

More High Pressure Transducers:

Combined Pressure and Temperature Sensor-Dual function
High Temperature Pressure Sensor
Melt Pressure Sensors/Transducers – High Temperature
Gas Pressure Sensor
Flush diaphragm pressure sensor
Digital Pressure Sensor
Sanitary Pressure Transmitter
Pressure Transducer 4-20mA/Voltage

Features of SI-702s High pressure transducer

  • Pressure range: 0-1500MPa …. 0-2000MPa to 0-7000MPa (customized)
  • Accuracy level: 0.1% FS, 0.2% FS, 0.5% FS
  • All stainless steel structure
  • Internally generated calibration signal
  • Using high-voltage accessories
  • Protection class IP65

Maybe you just need high pressure pressure sensor: 0 ~ 40MPa… 600MPa.

Specifications of High pressure transducer

Pressure range: 0-1500MPa …. 0-2000MPa to 0-7000MPa (customized)
Comprehensive accuracy: 0.1% FS, 0.2% FS, 0.5% FS
Output signal: 4-20mA ( 2 wire system), 0-5 / 1-5 / 0-10VDC (3 wire system)
Power supply voltage: 24VDC (10-30VDC)
Medium temperature: -20 ~ 75 ℃
Ambient temperature: -20 ~ 75 ℃
Load resistance: Current output type: max. 800Ω; Voltage output type: greater than 50KΩ
Insulation resistance: Greater than 2000MΩ (100VDC
Sealing grade: IP65
Long-term stable performance: 0.1% FS / year
Vibration effect:Within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical interface: Four-core aviation connector, Hessman connector optional
Thread interface: Ball head M20 × 1.5, cone head M20 × 1.5, M22 × 1.5, etc. Other threads can be designed according to customer requirements.

Ultra high pressure quick connector-1 / 4NPT 3 / 8NPT high pressure connector

Features: High-strength carbon steel. Galvanized surface treatment. Check valves at both ends. Steel ball lock. Interchangeable with ENERPAC / parker3000.
Thread: 1 / 4NPT. 3 / 8NPT
Working temperature: -30-100 ℃
Maximum working pressure: 10000psi (700bar)
Features: High-strength carbon steel, galvanized surface, check valves at both ends, steel ball lock, 2 times safety factor.
Product description: The HP high-pressure series is designed for use in high-pressure environments. All metal parts are made of steel. The base of the female connector is treated by QPQ. The base of the male connector is treated by all black galvanizing.

SI-702s High pressure transducers types

SI-702Q Ultra-High Pressure Sensor

SI-702Q Ultra High pressure transducer adopts spherical sealing method. It can choose 0-20mV, 4-20mA, 0-5VDC output. The ultra-high pressure pressure transmitter uses fully integrated rare alloy materials. Fine machining. Multiple heat treatment processes. Each sensor undergoes rigorous pressure testing to ensure absolute safety and reliability. The sensor has high accuracy, long-term stability, and long life specialty.

SI-702Z Ultra High Pressure Sensor

SI-702Z Ultra High pressure transducer is an extended product of 702S. It is characterized by a 58 degree outer cone seal. The ultra-high pressure structure and processing technology ensure the long-term reliability of the product. High accuracy, long life, and various electrical interfaces to choose from.

SI-702W Ultra High Pressure Sensor

SI-702W Ultra High pressure transducer, M20 × 1.5 external thread with 60 degree inner cone seal. Fine machining, multiple heat treatment processes. Each sensor undergoes rigorous pressure test and high and low temperature aging. It guarantees absolute safety and reliability. The sensor has the characteristics of high accuracy, good stability and long life. Various electrical interfaces are available.

SI-702N Ultra High Pressure Sensor

SI-702N Ultra High pressure transducer, M20 × 1.5 internal thread with 60 degree inner cone sealing method. Each sensor has undergone strict pressure test and aging. It guarantees absolute safety and reliability. It has high accuracy, long-term stability and long life. Features. A variety of shapes can be selected and a variety of electrical interfaces can be selected.

Applications of SI-702S Ultra High pressure transducer

SI-702S Ultra-High Pressure Transducer is designed for high pressure hydraulic circuit applications. The electronic components with excellent stability are selected and the voltage and current output signals are used. Therefore, SI-702S Ultra-High Pressure Senors is used in applications that require long-distance transmission signals or intelligent control and detection systems.

  • Construction of test platform
  • Water jet cutting
  • High-pressure pasteurization
  • High pressure cleaning
  • High voltage processor
  • Water cutting machinery
  • Hydraulic components
  • High-voltage systems, etc.

Technical Support

What is a high pressure transducer?

High pressure transducer is a pressure transmitter suitable for high pressure measurement and control.

Sino-Inst high pressure transducer has gone through thousands of fatigue impact tests and several days of low and medium temperature aging cycles before leaving the factory. It has solved the disadvantages of high pressure sensors in terms of stress and zero instability. Provide customers with reliable products for high voltage measurement. The pressure of SI-702 series can reach 600MPa. The precision level is high, and the mature production technology can ensure the long-term stability of the sensor with excellent characteristics. SI-702 series pressure sensors are suitable for oil extraction platforms, water flow equipment, high pressure measurement equipment, hydraulic control systems, test benches and industrial automation control.

More about high pressure transducer wikipedia.

FAQ

What does a pressure transducer do?

A pressure sensor (Pressure Transducer) is a transmitter that can sense pressure signals and convert them into usable output electrical signals according to certain rules.
The pressure sensor usually consists of a pressure sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

How do you test a pressure transducer?

Today I will mainly introduce three common detection methods for pressure sensors. Hope it helps everyone.
1. Pressure test. The method of detection is to power the sensor. Use your mouth to blow the air hole of the pressure sensor. Use the voltage file of a multimeter to detect the voltage change at the output of the sensor. If the relative sensitivity of the pressure sensor is large. This amount of change will be obvious. If nothing has changed. You need to use a pneumatic source to apply pressure instead.
2. Zero point detection. Use the voltage file of a multimeter. Detect the zero output of the sensor under no pressure. This output is generally mV level voltage. If the technical specifications of the sensor are exceeded, the zero deviation of the sensor is out of range.
3. Detection of bridges. It mainly detects whether the circuit of the sensor is correct. It is generally a Wheatstone full-bridge circuit. Use the ohm file of the multimeter to measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output impedances of the pressure sensor. If the impedance is infinite, the bridge is disconnected. It means there is a problem with the sensor or the definition of the pin is not correct.

How does a 3 wire pressure transducer work?

The output signal of the two-wire pressure transmitter is generally 4-20MA. The supply voltage is 24VDC. The two wires are a red (representing positive 24V power supply), and a black or blue (representing positive signal output). The wiring method is that the red wire is connected to the positive source and the blue wire is connected to the signal positive, and then the power supply negative and the signal negative are shorted.
The three-wire pressure transmitter is generally a voltage output. Wire one (red power supply is positive), one black (power supply is negative), and one yellow (signal output is positive). The output ground is common to the power supply.

Why shouldn’t you use a pressure transducer with high oxygen environment?

Oxygen plays an important role in the smelting process, chemical industry, national defense industry, and healthcare. However, the process of oxygen production and use is extremely prone to combustion and explosion.
The analysis is based on the mechanism of the “three elements” of combustion and explosion (combustible materials, oxidants, and excitation energy). The high-purity high-pressure oxygen transported in the oxygen pipeline is a very strong oxidant. The higher the purity, the higher the pressure, the stronger the oxidation, the more dangerous.
The potential sources of excitation energy for combustion or explosion are roughly the following: friction, compression heat, impact force, arc, resonance, etc.
In the construction of industrial oxygen pipelines, multiple cleaning processes such as derusting, scrubbing, sand blasting, blowing, degreasing, and acid cleaning should be carried out. Remove the oil and impurities in the pipeline to make it reach the condition of transporting oxygen medium. Check and accept according to relevant standards, and use it after passing the test.
For oxygen pressure measurement, choosing a clean instrument filled with inert oil not only improves the safety level, but also greatly reduces the risk of economic and time loss caused by maintenance or failure replacement.
Sino-Inst pressure sensor for oxygen measurement
Accuracy: ± 0.15% FS
Fill with Fluorolube® oil to ensure no oxidation reaction
Oil-free production process, oxygen-level cleaning process
Φ19mm standard OEM pressure / differential pressure sensor
Constant current / constant voltage power supply
All stainless steel 316L material

Sino-Instrument offers High pressure sensors. A wide variety of High Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of High Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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