What is a static pressure sensor?

Static pressure sensors are often used to measure static air pressure. Such as the static pressure on air filters and cooling coils, the input and discharge pressure of blowers, etc.

In ventilation systems, static pressure is the pressure of the air inside the building relative to the air outside when the exhaust fans are turned on. Measuring and maintaining proper negative pressure allows ventilation systems to more effectively mix outside air with inside air.

Types

Diaphragm pressure sensors are based on the structure of the sensor. According to the sensing principle, diaphragm pressure sensors can be divided into different types such as piezoresistive, strain gauge, inductive, capacitive, and piezoelectric.

Among the above-mentioned pressure sensors with different principles, piezoelectric pressure sensors are only suitable for measuring dynamic pressure, so dynamic calibration is required;

Other dynamic and static pressures can be measured, and the most widely used one belongs to the quasi-static measurement with very low frequency. Therefore, static calibration is the most widely used calibration form. When the measured pressure frequency band is wide, all kinds of pressure sensors should be calibrated for frequency response.

Learn more about: Pressure Transmitter Calibration Formula

Hydro Static Level Transmitter

Hydrostatic level transmitters are based on the principle that the measured static pressure of a liquid is proportional to the height of the liquid. A device that converts static pressure into electrical signals by using the piezoresistive effect of diffused silicon or ceramic sensitive elements.

After temperature compensation and linear correction, it is converted into 4-20mADC standard current signal output.

The sensor part of the submersible static pressure liquid level transmitter can be directly put into the liquid. The transmitter part can be fixed by flange or bracket, which is very convenient to install and use.

Applications

Read More about: Common Pressure Sensor Applications

More Pressure Measurement Solutions

Sino-Inst is a manufacturer of Static Pressure Sensor and Transmitters. We offer more than 50 types of pressure sensors. Main products include compact pressure transmitters, industrial pressure transmitters, differential pressure transmitters, single pressure crystal silicon transmittance pressure transmitters, diff pressure transmitter, high temperature pressure transmitter, explosion-proof pressure transmitter, pressure transmitter, custom pressure transmitter, with remote pressure transmitter, 316 diaphragm pressure transmitter.

Read more about: What is Diaphragm pressure gauge?

The static pressure sensor or static pressure transmitter is based on atmospheric pressure or absolute vacuum, and compares the difference between the measured pressure and atmospheric pressure or absolute vacuum.

For static, slowly changing pressure measurement. The sensor usually uses a high stability, thin film piezoresistive sensing element. The stability of the sensor and the accuracy of the measurement can meet the requirements of the industrial control field. There are a variety of connectors, electronic connections, signal output formats, accuracy and a wide range of ranges to choose from. These components are an ideal match for process monitoring and control, liquid level measurement, hydraulic system test studies and test cell requirements.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Static Pressure Sensor and Transmitter, level sensors, or other equipment, please give us a call.

Request a Quote

Pressure Transmitter

Featured Industrial Pressure Transmitters

Pressure Gauge

Read more about: Calculation Of Pressure Drop

Difference list: Pressure Transmitter vs Pressure Gauge

The difference between a pressure transmitter and a pressure gauge are:

1. The standard instrument accuracy required for pressure transmitter calibration is much higher than the standard instrument accuracy required for pressure gauges.
2. The pressure gauge only needs to verify the relationship between a pair of input and output, while the pressure transmitter may need to verify the relationship between input and communication data.
3. The calibration of the pressure gauge must have the corresponding measurement qualification, and the pressure transmitter is generally not required except for the production plant and new construction.
4. The precision of the pressure gauge is poor, there is no output, and the manual operator cannot be used. Generally, 5 points are checked, and the back and forth difference is different. The intelligent pressure transmitter generally only needs to calibrate the zero point and full scale.
5. The output of the pressure gauge is a scale indication, which is displayed by itself. The pressure transmitter is a current output and must be connected to an ammeter of the corresponding accuracy level for display.

More Pressure Measurement Solutions

Sino-Inst is a manufacturer of Pressure Transmitter. We offer more than 50 types of Transmitters. Main products include compact pressure transmitters, industrial pressure transmitters, differential pressure transmitters, single crystal silicon pressure transmitters, diffused silicon pressure transmitters , Diaphragm pressure transmitter, high temperature pressure transmitter, explosion-proof pressure transmitter, pressure transmitter, custom pressure transmitter, with remote pressure transmitter, 316 diaphragm pressure transmitter.

Sino-Inst’s Pressure Transmitters are the most commonly used sensors in industrial applications. Widely used in water conservancy and hydropower, railway transportation, intelligent building, production control, aerospace, military industry, petrochemical industry, oil well, electric power, ship, machine tool, pipeline and other industries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Pressure Transmitter, level sensors, or other equipment, please give us a call.

Request a Quote

Featured 4-20ma Pressure Transmitters for Sale

Troubleshooting for 4-20ma Pressure Transmitter

1. The pressure transmitter has no output and no display

Extended Reading: Resistive Pressure Transducer

2. Pressure transmitter output ≥ 20mA

3. Transmitter output≤4mA

4. The pressure display/output signal is incorrect and has errors

Extended Reading: Smart pressure transmitter

5. The pressure control system cannot be connected

The input of the pressure indicating instrument is 4~20mA, and the output signal of the transmitter can be directly connected.
If the input of the pressure indicating instrument is 1~5V. Then a resistor with a precision of 1/1000 or above and a resistance of 250Ω must be connected to the input terminal of the pressure indicating instrument. Then connect to the input of the transmitter.

No matter which pressure transmitter you choose. The signal output by the pressure transmitter, such as 4-20mA. The pressure signal can be interfaced to a paperless recorder. Multi-channel pressure signal monitoring.

6. recorder no record

When the multipoint paper recorder does not record. If the input is open, then:

1. No other loads can be carried;
2. Use another recorder with input impedance ≤250Ω when there is no record.

7. The temperature of the pipeline is too high

The temperature of the pipeline is too high, add a buffer tube to dissipate heat. It is best to add some cold water to the buffer tube before use. In order to prevent the superheated steam from directly impacting the sensor. Thereby damaging the sensor or reducing the service life.

Read more about: Pressure Sensor Applications-Featured Industry Applications

8. Pressure Transmitter 4-20mA installation problem

In steam flow measurement, steam mainly involves two kinds, one is external steam, and the other is superheated steam of boiler.

The externally supplied steam is the steam after decompression and decompression. The temperature is not high, and it is mixed with a lot of water. It needs to be used and not used. The steam flow rate can be changed according to the user’s requirements.

In the actual flow measurement process, sometimes the flow rate is too large and sometimes the flow rate is too small. It is very unstable. Blowdown is often required. The measurement of the transmitter is accurate after each blowdown. All joints on the pressure guiding pipe leak steam.

In the use of measuring superheated steam, the biggest problem found is that sometimes the machine shuts down, and the flow rate will deviate after restarting, resulting in inaccuracy. Sometimes there is still a little flow display after stopping.

Generally, the installation position of the transmitter is lower than the measuring pipe. But in the actual installation, the condensing tank and the transmitter for external steam flow are both higher than the measuring pipe, and the pressure guiding pipe that is laid down at least 1 meter from the throttling device is too short.

The superheated steam flow of the boiler also has the problem of inconsistent heights between the condensing tank and the measuring pipe. This leads to an imbalance in the height of the condensed water, which causes a static pressure difference.

9. Pressure guide pipe blockage problem

In pressure measurement, sometimes the indicated pressure does not vary with operating conditions. After opening the drain valve, there is only a small amount of sewage and no water flows out. This is because there will be a small amount of floating dust in the water quality or compressed air, which will enter the pressure guiding pipe for sedimentation along with the water flow. After a long period of operation, the wall of the pressure guiding pipe will be corroded and fouled, and blockage will occur.

10. Pressure Transmitter 4-20mA equipment itself fault problem

In the measurement of lubricating oil pressure, since the lubricating oil pressure signal participates in the shutdown interlock control. The signal measured by the lubricating oil pressure transmitter is transmitted to the computer. On the one hand, it is displayed. On the other hand, the signal is compared by the program. When the pressure is lower than 0.06MPa, it will send a signal to stop due to lack of oil.

From the trend graph of the lubricating oil pressure signal, it can be seen that the pressure is an instantaneous drop in a straight line, resulting in a trip. After checking the transmitter, it was found that the internal module of the transmitter was damaged. Although the transmitter is regularly calibrated every year, it is used for production after passing the test.

After several years of operation of the transmitter, its accuracy, sensitivity, stability and other performance indicators will gradually decrease. The internal diaphragm and integrated block will also be damaged and malfunction.

11. There is an interference problem

In the measurement of the exhaust pressure of the air compressor, the fluctuation of the exhaust pressure signal is large. After the transmitter is verified, it meets the accuracy requirements, and the fault of the transmitter itself is eliminated.

Check that the pressure guide tube and connector are not damaged or leaked. The connection of the signal cable is in good contact.
However, the direction of the cables is introduced into the control room through the cable bridge next to the high-end distribution room. There is a lot of electromagnetic interference around.

More Pressure Measurement Solutions

Sino-Inst is a manufacturer of Pressure Transmitter 4-20mA. We offer more than 50 types of Transmitters. Main products include compact pressure transmitters, industrial pressure transmitters, differential pressure transmitters, single crystal silicon pressure transmitters, diffused silicon pressure transmitters , Diaphragm pressure transmitter, high temperature pressure transmitter, explosion-proof pressure transmitter, pressure transmitter, custom pressure transmitter, with remote pressure transmitter, 316 diaphragm pressure transmitter.

The Pressure Transmitter 4-20mA is mainly used to measure the pressure and liquid level of the medium. In industrial production, it is widely used. Sino-Inst pressure transmitter adopts high-quality diffused silicon type, and the pressure transmitter adopts a dedicated integrated module. Fine temperature, zero point, full scale and nonlinear compensation. Realize accurate measurement and transmission of pressure changes in liquid, gas, steam and other media. Realize the ideal monitoring of changes in pressure and vacuum media in various places for enterprises, scientific research institutes and other departments.

Sino-Inst’s Pressure Transmitters 4-20mA are the most commonly used sensors in industrial applications. Widely used in water conservancy and hydropower, railway transportation, intelligent building, production control, aerospace, military industry, petrochemical industry, oil well, electric power, ship, machine tool, pipeline and other industries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Pressure Transmitter 4-20mA, level sensors, or other equipment, please give us a call.

Request a Quote

gas pressure measurement

Gas pressure sensors are designed (or configurable) to measure gas pressure in different ways. In industrial settings, they can be used to measure the velocity of gas flow (sometimes called “shock pressure”), confirm the presence of suction, manage source pressure, or test for leaks.

(1). Gauge pressure is measured relative to ambient atmospheric pressure. Atmospheric pressure at sea level is about 100kPa (14.7 PSI). Sensors built into tire air pumps measure pressure this way, showing the air pressure inside the tire relative to the local atmospheric pressure. A reading of zero indicates equal internal and external pressure.

(2). Sealed air pressure sensors are similar to gauge air pressure sensors. But are pre-calibrated to measure air pressure relative to sea level atmospheric pressure. Therefore, if the device is taken to a different altitude or location, its readings will not change. More about: Diaphragm pressure gauge working principle.

(3). Vacuum pressure is a measure of the negative difference between the gas pressure at a given location and the atmospheric pressure.

(4). Absolute air pressure is measured from zero or perfect vacuum (0 PSI). Again, unlike gauge pressure, this is not affected by the conditions surrounding the device. These conditions will vary with altitude and other factors.

(5). Differential pressure is the difference between two gas pressures. For example, the pressure difference in two gas hoses connected to the sensor. As with gauge pressure, a sensor may be able to measure changes in air pressure in either direction (i.e. positive or negative).

In addition to different types of measurements, some barometric pressure sensors are also designed to measure rapid pressure changes in dynamic environments. For example combustion pressure in engine cylinders or gas turbines.

Extended Reading: 4-20ma pressure transducer wiring diagram

Oxygen (O2) Pressure Measurement

Oxygen plays an important role in the smelting process, chemical industry, national defense industry, and medical care. However, the production and use of oxygen is extremely prone to combustion and explosion.

According to the mechanism of combustion and explosion “three elements” (combustibles, oxidants, excitation energy). The stronger, the more dangerous. Potential excitation energy sources for combustion or explosion are generally in the following ways: friction, compression heat, impact force, electric arc, resonance, etc.

For oxygen pressure measurement, a clean pressure sensor and a transmitter filled with inert oil is a safer choice. The risk of financial and time loss due to maintenance or faulty replacement is greatly reduced.

During the construction of industrial oxygen pipelines, multi-channel cleaning processes such as rust removal, scrubbing, sandblasting, blowing, degreasing, pickling, etc. should be carried out to remove oil and impurities in the pipelines so that they can meet the conditions for transporting oxygen media. And in accordance with relevant standards Check and accept. It can be used only after passing the test.

Extended reading: High accuracy pressure transducers

Featured Oxygen Sensors and Transducers

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.

The pressure sensor for oxygen measurement supplied by Sino-Inst is required for the application of oxygen pressure measurement. The sensor product is filled with Fluorolube® oil. At the same time, oil-free technology is used for production. Finally, the sensor and transmitter are cleaned and packaged according to the oxygen level cleaning process.

The above sensors can be used in hazardous locations, including explosion-proof, intrinsically safe products. And it can be used in the occasions involving oxygen pressure measurement such as factories and hospitals.

The special pressure sensor for oxygen measurement must be cleaned strictly by oxygen grade cleaning process. Ensure that the sensor is clean and free of oil, corrosion, scaling, particles and other impurities. During the oxygen pressure measurement process, the potential risk of oxygen combustion or explosion caused by sensor oil pollution is completely solved.

Oxygen grade cleaning operations must be carried out in a dust-free and clean environment. To be operated by trained and qualified professionals. Use a special cleaning agent to clean the sensor and its accessories. Cleaning needs to go through multiple processes such as soaking, wiping, scrubbing, rinsing, drying, and sealing packaging. At the same time, during the cleaning process, special inspection equipment and precision instruments are used to conduct qualitative and quantitative inspections of the oil on the surface of the sensor. Make sure the sensor is clean.

Sino-Inst has an oxygen level cleaning platform, perfect cleaning process and quality control process. It cleans and seals the pressure sensor and pressure transmitter for measuring oxygen and high cleanliness.

Extended Reading: strain gauge pressure transducer

Hydrogen (H2) Pressure Measurement

Hydrogen (H2) is an extremely flammable, colorless, and odorless gas at normal temperature and pressure. Hydrogen has strong reducing properties and is a common industrial gas. It has a large number of applications in chemical, electronic, automotive, aerospace and other industries.

Hydrogen is easy to diffuse rapidly. When the ratio of hydrogen mixed with air exceeds 4%, it will become a combustible gas. Therefore, strict process and process control are required in the process of production, storage and transportation.

Since the hydrogen atom is very small, it will diffuse through the lattice of the diaphragm (usually stainless steel), thereby penetrating into the cavity filled with silicone oil. After long-term use, the infiltrated gas can damage the sensor.

Although gold is less permeable than stainless steel, gold-plated diaphragms are an effective way to prevent hydrogen permeation.

Extended Reading: Smart pressure transmitter working principle

Featured Hydrogen Pressure Sensors and Transducers

The pressure sensor dedicated to hydrogen measurement has many advantages in the pressure monitoring application of hydrogen production and purification equipment, hydrogen storage and transportation equipment.

In the process of measuring hydrogen pressure with a piezoresistive isolated pressure sensor. Since the atoms of hydrogen are very small, they will diffuse through the lattice of the diaphragm (usually stainless steel), thereby penetrating into the cavity of the sensor filled with silicone oil. Over time, the permeated gas can seriously affect the performance of the sensor. Effectively prevent the occurrence of “hydrogen embrittlement” and “hydrogen permeation”.

1. Measuring range: -100kPa…0kPa~35kPa…20MPa
2. Isolated structure, suitable for the measurement of hydrogen medium;
3. Pure flat membrane structure, using no dead angle full welding technology, the minimum thickness of gold plating layer is greater than 2μm;
4. The purity of gold plating on the surface reaches 99.8%;

The problem of hydrogen storage and transportation is an important factor affecting the cost of hydrogen. Pipeline hydrogen transportation has low cost and low energy consumption. It can realize continuous, large-scale and long-distance transportation of hydrogen energy. It is an important breakthrough direction for hydrogen storage and transportation problems.

It can be applied to hydrogen transportation scenarios such as hydrogen transportation vehicles. At the same time, it is also very suitable for pressure measurement of hydrogen storage cylinders and tank trucks and other gas and liquid hydrogen in hydrogen transportation.

Read more about: Types of biogas flow meters

Chlorine (CL2) Pressure Measurement

Chlorine is a simple substance formed by chlorine, with the chemical formula Cl2. It is yellow-green under normal temperature and pressure. It is a highly toxic gas with a strong pungent smell. It is suffocating and has a higher density than air.

Melting point -101.00°C, boiling point -34°C. Soluble in water and alkali solution, easily soluble in organic solvents (such as carbon tetrachloride), hardly soluble in saturated saline. It is easy to compress and can be liquefied into yellow-green oily liquid chlorine.

Generally, steel, iron, copper, nickel, etc. are resistant to dry chlorine, but once chlorine gas is mixed with a small amount of water, it will generate hypochlorous acid and hydrochloric acid, which are highly corrosive to most metals.

Therefore, pressure sensors and transmitters used for chlorine pressure measurement must use special corrosion-resistant housing and diaphragm materials to ensure reliable and accurate measurement.

More about: The Difference Between Absolute And Gauge Pressure

Featured Chlorine Pressure Sensors and Transducers

There are 2 types of chlorine pressure transmitters that are common:

1. Dry chlorine. Pure chlorine gas is non-corrosive. It can be said that it is economical and affordable to use ordinary pressure gauges to measure pressure.
2. Moist chlorine. If chlorine contains water, chlorine and water will react chemically to synthesize HCL and chloride ions. We all know that chloride ions are highly corrosive, and a special pressure transmitter must be used to measure pressure in order to resist the corrosion of chloride ions.

The pressure gauge used to measure chlorine gas containing moisture is a dedicated diaphragm pressure transmitter. The material of the instrument diaphragm isolator is 316L+F4, and the isolation diaphragm is 316L+F4. This diaphragm pressure transmitter is the most cost-effective. Isolation diaphragm can also choose Ta+F4. The price of this chlorine pressure transmitter is relatively high.

According to the actual situation of the user, select the chlorine gas pressure transmitter suitable for the actual situation on site.

Extended Reading: MEMS Pressure Sensors

High Temperature Gas Pressure Sensors

High Temperature Gas Pressure Sensor for pressure measurement of high temperature gas. High temperature up to 800 ℃.

High Temperature Pressure Sensor with high temperature resistant pressure core or sapphire core as pressure measurement material. After high reliability amplifier circuit and precise temperature compensation. The absolute or gauge pressure of the measured medium is converted into standard electrical signals such as 4 ~ 20mA, 0 ~ 5VDC, 0 ~ 10VDC. It is also widely used in industry. Collect pressure signals at the points of some high-temperature steam and fluid pipes.

• 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

More Gas Measurement Solutions

Sino-Inst is a manufacturer of Industrial Gas Pressure Sensors and Transducers. We offer more than 50 types of Gas Pressure Sensors.

Industrial Gas Pressure Sensors and Transducers are used in hydraulic and pneumatic control systems, thermoelectric units, constant pressure water supply systems, power station operation inspections, petrochemical, environmental protection, air compression, locomotive braking systems, light industry, mechanical metallurgy, building automation, and other automation And testing systems, industrial process testing and control, laboratory pressure calibration, etc.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is Industrial Gas Pressure Sensors and Transducers, level sensors, or other equipment, please give us a call.

Request a Quote

Sino-Inst, as a manufacturer of Water Pressure Sensors. We provide water pipe pressure sensors, water tank pressure sensors, drinking water pressure sensors, groundwater pressure sensors, deep well pressure sensors, etc. Guarantee accurate, stable and reliable pressure measurement. 0~300psi, 1000psi, 2000psi and other customizable pressure ranges. Parameters such as materials, output signals, and pressure ports can be customized as required.

Featured Water Pressure Sensors and Transducers

The so-called water pressure refers to the pressure of water.

It is generally believed that 0.1Mpa=10 meters of water, and the supply pressure at the end of the pipe network is 0.14Mpa. More intuitively, 0.1MPa is equivalent to a standard atmospheric pressure. The supply pressure at the end of the pipe network is 0.14Mpa, which is equivalent to a height of 14 meters from the tap to the water supply tower (pool).

Sino-Inst’s water pressure sensors are used in various industries and fields. Such as hydropower stations, hydrology, environmental monitoring, etc.

For example, they measure water depth, monitor seawater pressure in dams, calculate flow rates and control water levels.

Due to the rich experience in water pressure sensors installed in pipes, water tanks, etc., Sino-Inst can provide you with extensive professional advice in various fields.

Water pressure sensors are used to measure the static pressure of water in pipelines, storage tanks, and many other applications.

Underwater pressure sensors can also be used to measure groundwater depth in boreholes and wells, as well as agricultural irrigation, etc.

The domestic water industry will collect and send parameters such as pressure, flow, and temperature of the pipeline to the platform. The platform will process the data. Real-time control of the operation of each point. Quick repair of equipment failure, greatly reducing equipment operating costs,

Pressure sensors are also being gradually installed on fire hydrants. Prevent losses caused by fire hydrant leakage.

Water pressure transmitter is the most commonly used pressure transmitter in the field of industrial automation. Widely used in water supply equipment, building water supply system. Residential, factory buildings, water conservancy and other pressure measurement and control. Water pressure transmitters will play an inestimable role in the future automation industry.

Industrial water supply, water treatment and other industries need to pump and pressurize continuously to send water to high places or increase water pressure. Installing a water pressure sensor can effectively monitor changes in water pressure. Even realize the control of the switch.

The water pressure sensor has gradually replaced the old pressure gauge. When you choose a pressure sensor, please pay attention to learn more about the actual working conditions. Choose a more suitable pressure sensor. To ensure long-term stable operation.

Extended reading: High accuracy pressure transducers

Featured Water Level Sensors

Pressure sensors can also be used as Water Level Sensors. Tank pressure sensors detect changes in the volume or level of water in a container.

The application of pressure transmitters to measure liquid levels has its own unique features. For the liquid level deviation caused by temperature changes, we can indirectly convert the density through the temperature compensation operation according to the corresponding relationship between density and temperature, and then calculate the height of the liquid column. And these are not difficult to realize in the control software. In particular, some smart transmitters have their own temperature compensation function.

In this way, the application of the pressure transmitter can be extended to the measurement of the liquid level of open containers such as oil level and chemical liquid. Read more about: Submersible Level Transducer Working Principle.

After the sensor and converter of the pressure transmitter are separated and arranged in the installation form, it can also be applied to the water level measurement of deep wells, groundwater and borehole water levels, sewage pools and other containers, and has a good application prospect.

Sino-Inst offers a range of liquid level sensors for water pressure measurement applications.

Extended reading: Troubleshooting For 4-20ma Pressure Transmitter

How to choose a water pressure sensor?

1. Absolute or gauge pressure measurement
2. Cable or flying lead pressure transmitter wiring
3. Media compatibility for pressure transmitters
4. Moisture resistance in pressure transmitters
5. Pressure transmitter accuracy and errors
6. Radiofrequency (RFI) and electromagnetic interference (EMI) in pressure transmitters
7. Standard or flush diaphragm pressure transmitters
8. Vibration resistance in pressure transmitters

Read more about: What is industrial pressure transmitter?

Extended Reading: Fluid pressure sensor

More Water Pressure-Water Level-Water Flow Monitoring Solutions

Water is important in every industry. Including agriculture, industry, fire protection, etc. How to effectively, stably, and low-cost monitor water resources is very important.

Sino-Inst provides a variety of solutions, including water pressure, water level, water flow monitoring in seawater solutions such as sewage treatment, seawater desalination, etc.

And:

• Liquid level and volume monitoring of water tank;
• sewage level;
• sewage flow;
• Oil-water Interface Level Measurement Guide
• 10 Ways to Water Flow Measurement
• Underwater Pressure or Level Measurement
• Water Level Transducers – Detailed Guide
• Choose the Right Float Switch for Water Tank
• Wastewater Level Sensor for Septic Tank-Sewage Holding Tank
• Water Level Monitoring Sensor/System for Sewage-Wastewater

More Pressure Measurement Solutions

Sino-Inst is a manufacturer of Water Pressure Sensors for Measurement of Water Pressure. We offer more than 50 types of Water Pressure Sensors.

Water Pressure Sensors pressure sensor is mainly used to measure the pressure and liquid level of the medium. In industrial production, it is widely used.

Sino-Inst Water Pressure Sensors adopt high-quality diffused silicon type, and the pressure transmitter adopts a dedicated integrated module. Fine temperature, zero point, full scale and nonlinear compensation. Realize accurate measurement and transmission of pressure changes in liquid, gas, steam and other media. Realize the ideal monitoring of changes in pressure and vacuum media in various places for enterprises, scientific research institutes and other departments.

Sino-Inst’s Water Pressure Sensors are the most commonly used sensors in industrial applications. Widely used in water conservancy and hydropower, railway transportation, intelligent building, production control, aerospace, military industry, petrochemical industry, oil well, electric power, ship, machine tool, pipeline and other industries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Water Pressure Sensor, level sensors, or other equipment, please give us a call.

Request a Quote

What Is a Pressure Sensor Example?

A pressure sensor is a device that can sense pressure signals and convert the pressure signals into usable output electrical signals according to certain rules. Sino-Inst, as a manufacturer of pressure sensors. We stock over 50 featured pressure sensors.

If you are using a pressure sensor for the first time, you may wonder, what is a pressure sensor? Why are there pressure sensors with various appearances on the market?

In fact, the pressure sensor is a general term. There are many types and styles of pressure sensors. However, you don’t have to worry about how to choose. You just need to inform us of your measurements and installation parameters. We will produce suitable pressure sensors according to the parameters you require. Including measuring range, temperature, display, mounting thread, output signal, etc.

For example, Below is a pressure sensor for measuring high temperature gas.
The parameters are roughly:

• Pressure range: 0-30psig,
• 300 degrees Celsius high temperature
• without local display;
• 4-20mA signal output;
• Mounting thread 7/16″-20UN-2A (Male SAE-4);

The above parameters are customized according to user requirements. Even the body length of the sensor is customized to the 160mm length requested by our customer.

Extended reading: High accuracy pressure transducers

Common Pressure Sensor Applications

Pressure Measurement

Pressure sensors can measure the pressure of liquid, steam, gas and other media. Convert pressure to electrical signal output.
Pressure sensors can be installed on pipelines to measure pipeline pressure.
A pressure sensor can be mounted on the tank wall to measure tank pressure.
So, as long as the installation space allows. The measured medium is compatible with the diaphragm material. Then the pressure sensor can measure.

Read more about: What Is The Function Of A Pressure Transmitter?

Differential Pressure Measurement

Differential pressure sensors can be used to measure the difference between two pressures, usually used to measure the pressure difference between the front and back of a device or component.

Differential pressure sensors need to pay attention to some matters in use:
For example:

• The measured medium is not allowed to freeze. Otherwise, the sensor element isolating diaphragm will be damaged. damage to the transmitter. Temperature protection of the transmitter is required when necessary. to prevent freezing;
• When measuring steam or other high temperature media. Its temperature should not exceed the limit temperature when the transmitter is used. A heat sink must be used for temperatures higher than the limit temperature used by the transmitter;
• When measuring steam or other high-temperature media, heat pipes should be used. Connect the transmitter and pipe together. And use the pressure on the pipeline to transfer to the transformer;
• When the measured medium is water vapor. A proper amount of water should be injected into the cooling pipe. To prevent the superheated steam from directly contacting the transmitter and damaging the sensor;

Separate differential pressure sensors are not currently used much. There are many pressure sensors that can measure both absolute pressure and differential pressure. This is very convenient for customers to use.

Liquid Level Measurement

Pressure sensors can be used to measure liquid levels using the hydrostatic principle. From open waters such as reservoir levels or sea depths to tanks and containers.
This assumes that the medium is a static liquid with constant specific gravity, and that the system compensates proportionally for liquids with different densities than clear water.

For example, when measuring the oil level in a tank, a lower specific gravity means a proportionally lower pressure per meter of still water depth or level.
Additionally, if the tank is not vented, or is sealed under pressure, it will be necessary to measure and compensate for the surface pressure above the liquid.

In practice, hydrostatic level measurements can use immersion probes and sealed cable assemblies to detect the head of liquid pressure above the probe inlet.
Alternatively, the pressure sensor can be mounted externally on the bottom of the tank or vessel.
A differential pressure sensor can be used to provide a single output for a sealed tank. The difference between two input pressures representing tank level and surface air pressure. Or the two sensors and outputs can simply be measured separately.

In addition, differential pressure sensors can also be used to measure gas flow, liquid level, etc.

A method of measuring gas flow through the difference between flow tube pressure and atmospheric pressure. Find the flow tube static pressure. The square root of static pressure is proportional to flow, giving flow.
The liquid level measurement method measures the pressure difference between the high and low liquid levels. Then calculate the height of the liquid surface according to the density of the liquid.

Read more about: Differential pressure level transmitter working principle

Flow Measurement

The flow measurement is realized by differential pressure measurement. That is to say, the measurement is carried out by using the working principle that there is a certain relationship between the pressure difference and the flow rate generated when the medium fluid flows through the throttling device.

With the continuous development of flow sensors, more and more types of flow sensors are gradually coming out. They each have their own advantages and disadvantages. When users choose flow sensors, they should choose the appropriate sensor according to their own needs. .

The differential pressure flow sensor is an instrument that calculates the flow rate based on the differential pressure generated by the flow detection device installed in the pipeline, the known fluid conditions and the geometric dimensions of the detection and pipeline.

When the fluid filled with the pipeline flows through the throttling piece in the pipeline, the flow velocity will form a local contraction at the throttling piece. Therefore, the flow velocity increases and the static pressure decreases. Therefore, a pressure difference is generated before and after the throttling piece. The greater the flow rate, the greater the pressure difference. In this way, the flow rate can be measured according to the pressure difference.

Read more about: What is a differential pressure flow meter?

Differential pressure flow meter calculation

Density Measurement

Differential pressure online density meter (also known as online density transmitter) is a device for continuous online measurement of liquid concentration and density. It can be directly used in industrial production processes. The differential pressure sensor is one of the core components.

The intelligent online density meter adopts the principle of differential pressure density meter, which can calculate the density value according to the differential pressure value of the medium at a certain vertical distance, and automatically perform temperature compensation. It has high precision and good reliability. It is easy to install and use.

The two-wire density transmitter is mainly used for industrial process control. The online density meter generates a corresponding 4-20mA signal according to the concentration and density. It can be remotely calibrated and monitored through digital communication.

Pressure Sensor Applications in Various Industries

Pressure Sensor in Petrochemical Industry Applications

Pressure sensor is one of the most commonly used measuring devices in petrochemical automatic control.

In some large-scale chemical projects, almost all pressure sensors are applied to differential pressure, differential pressure, high temperature, absolute pressure, gauge pressure, high pressure, low temperature, and remote flange pressure sensors of various materials and special processing.

It is not difficult to see that the petrochemical industry has a relatively concentrated demand for pressure sensors in terms of reliability, stability and high precision.

However, reliability and many additional requirements (such as range ratio, bus type, etc.) depend on the design structure, process and material level of the transmitter.

The stability and measurement accuracy of the pressure sensor can ensure the stability and high precision of the pressure transmitter. The measurement accuracy and response speed of the pressure sensor correspond to the measurement accuracy of the pressure transmitter. The temperature and static pressure characteristics and long-term stability of the pressure sensor correspond to the stability of the pressure transmitter.

The petrochemical industry’s demand for pressure sensors is mainly reflected in measurement accuracy, response speed, temperature resistance, static pressure characteristics and long-term stability.

The current miniature pressure sensor is mainly a new type of pressure sensor manufactured by using semiconductor materials and MEMS technology. It has the advantages of high precision, high sensitivity, small size, corrosion resistance, low cost, and good dynamic characteristics.

Pure single crystal silicon material is prone to fatigue, and micro pressure sensors made of this material have good long-term stability. At the same time, the miniature pressure sensor increases the temperature compensation accuracy, which greatly improves the temperature characteristics and measurement accuracy of the sensor. If two miniature pressure sensors are integrated, static pressure compensation can be implemented to improve the static pressure characteristics of the pressure sensor.

At present, micro pressure sensors have many advantages that traditional pressure sensors do not have. It is very suitable for the demand of pressure sensor in petrochemical industry.

Pressure Sensor in City Power Gas Industry Applications

Water, electricity, and gas are closely related to people’s lives. Its stable and safe transportation is very important. In order to ensure the normal use of this important urban living resource, a sufficiently stable and accurate instrument is required to perform real-time numerical measurement of related equipment. .For maintenance personnel to monitor equipment operation. Pressure transmitters meet this requirement.

For example, pressure transmitters can monitor the pressure of gas pipelines in real time. Once a leak occurs, the pipeline pressure will drop. Such as exceeding the preset safe pressure value. An alarm will be triggered and an abnormal location will be prompted.

Through the intelligent gas pipeline network, subsystems such as automatic control of fusion stations, video surveillance, pressure regulator pressure monitoring, leakage monitoring in confined spaces, and remote transmission of industrial user data monitoring can be connected. Realize 24-hour all-round uninterrupted monitoring. Transform “unmeasurable risk” into “preventable and controllable”.

Pressure Sensor in Paper Industry Applications

Pressure Sensor in Paper Industry Applications

Pulp and paper, used where resistance to chemical liquids, corrosive liquids, etc. is required.

In the material preparation section of the papermaking industry, the pressure transmitter is mainly involved in the flow measurement of the pulp, water and acid or alkali during the pulping process. Therefore, it is necessary to choose carefully when selecting the electrode material.

In the screening and bleaching section, the lining material of the pressure transmitter should preferably be PFA or PTEE.

Some of the raw materials and various chemical reagents used in the paper industry are corrosive. The measuring equipment used in this industry must first have strong corrosion resistance, and can accurately measure the relevant parameters of the liquid level such as pulp with complex components. Pressure change The feeder also has a place in the paper industry because of its anti-corrosion design.

Pressure Sensor in Steel-Metallurgical Industry Applications

When it comes to the steel industry, many people’s first impression is high temperature and high pressure. Thousands of degrees of high temperature can melt many materials. Huge pressure is also unbearable for many measuring instruments. Therefore, steel has high requirements for the use of measuring tools.

Pressure sensors with high temperature and high pressure capabilities are accepted by the iron and steel metallurgy industry.

Pressure Sensor in Water Supply-Wastewater Treatment Industry Applications

In the water and wastewater industry, the reliability of instrumentation is critical. The use of pressure transmitters can provide an important means for system protection and quality control.

Even in harsh or aggressive media in applications such as desalination plants or sludge treatment. The pressure transmitter is still able to operate stably. At the same time, the excellent anti-vibration performance enables it to be installed on the pump. This advantage makes pressure transmitters ubiquitous in the water treatment industry.

Also in water conservancy and hydropower, pressure transmitters also play a pivotal role. Because the level of automation is one of the important indicators to measure the modernization level of hydropower plants.

If the computer monitoring system of a hydropower plant is compared to the brain of an automation system. Then the pressure, temperature, flow, liquid level and other sensors are the eyes and ears of the computer monitoring system to complete the process monitoring and control.

Pressure Sensor in Machinery, Shipbuilding Industry Applications

It is used in places where stable measurement is required under strict control and high precision conditions. In general, pressure transmitters are mainly used to measure the pressure and liquid level of the medium.
In the production of our machinery and shipbuilding industries, pressure sensors are widely used.

Pressure Sensor in Medical Application

With the development of the medical equipment market, higher requirements are put forward for the use of pressure sensors in the medical industry. Such as accuracy, reliability, stability, volume, etc. need to be improved. Pressure sensors have good applications in minimally invasive catheter ablation and temperature sensor measurement.

Pressure Sensor in Hydraulic System Applications

The pressure sensor is mainly used in the hydraulic system to complete the closed-loop control of the force. When the control spool moves suddenly, a peak pressure several times the system working pressure will be formed in a very short time.

In typical mobile machinery and industrial hydraulics, if such extreme conditions are not considered in the design, any pressure sensor will be destroyed very quickly. Shock-resistant pressure sensors are required.

There are two main methods for the pressure sensor to achieve impact resistance, one is to change the strain gauge chip, and the other is to connect an external coil. Generally, the first method is used in the hydraulic system, mainly because of the convenience of installation. Another reason is that the pressure sensor is subjected to constant pressure pulsations from the hydraulic pump.

Pressure Sensor in Safety Control System Applications

Pressure sensors are often used in safety control systems, mainly for the safety management system of the air compressor itself. There are many sensor applications in the field of safety control, and pressure sensors are a very common sensor. It is not surprising that they are used in safety control systems.

The application in the field of safety control is generally considered from the aspect of performance, from the consideration of price, and from the consideration of the safety and convenience of actual operation. It has been proved that the effect of choosing a pressure sensor is very good.

The pressure sensor uses the processing technology of mechanical equipment to install some components and signal conditioners on a small chip. So small size is also one of its advantages. In addition, cheap price is also another major advantage of it.

To a certain extent, it can improve the accuracy of system testing. In the safety control system, the pressure brought by the compressor is controlled to a certain extent by installing a pressure sensor in the pipeline equipment at the gas outlet. This is a certain protection measure and a very effective control system.

When the compressor starts normally, if the pressure value does not reach the upper limit, then the controller will open the air inlet to make the equipment reach the maximum power through adjustment.

Pressure Sensor in Injection Mold Applications

Pressure sensors play an important role in injection molds. The pressure sensor can be installed in the nozzle of the injection molding machine, the hot runner system, the cold runner system and the cavity of the mold. It can measure the flow of plastic from the nozzle of the injection molding machine to the Plastic pressure somewhere between cavities.

Pressure Sensor in Monitoring Mine Pressure Applications

Sensor technology is one of the key technologies for mine pressure monitoring.
On the one hand, we should correctly apply various existing sensors to serve the mining industry.
On the other hand, as a sensor manufacturer, it is necessary to develop and develop new pressure sensors to adapt to more mining industry applications.

There are many kinds of pressure sensors, and based on the special environment of mine pressure monitoring, mine pressure sensors mainly include: vibrating wire pressure sensors, semiconductor piezoresistive pressure sensors, metal strain gauge pressure sensors, differential transformer pressure sensors, etc. More about: Diaphragm pressure gauge working principle.

These sensors are widely used in the mining industry. Which sensor to use depends on the specific mining environment.

Pressure Sensor in compressors, air-conditioning refrigeration equipment Applications

Pressure sensors are often used in air compressors and air-conditioning and refrigeration equipment. These sensors are small in size and easy to install. The pressure guide port generally adopts a special valve needle design.

Featured Pressure Sensors for Sale

More Pressure Measurement Sloutions

Besides pressure sensors, we also supply torque sensors. What Is a Torque Transducer? How to Choose?

Sino-Inst is a manufacturer of pressure sensors. We offer more than 50 types of pressure sensors. Main products include compact pressure transmitters, industrial pressure transmitters, differential pressure transmitters, single crystal silicon pressure transmitters, diffused silicon pressure transmitters , Diaphragm pressure transmitter, high temperature pressure transmitter, explosion-proof pressure transmitter, pressure transmitter, custom pressure transmitter, with remote pressure transmitter, 316 diaphragm pressure transmitter.

The pressure sensor is mainly used to measure the pressure and liquid level of the medium. In industrial production, it is widely used. Sino-Inst pressure transmitter adopts high-quality diffused silicon type, and the pressure transmitter adopts a dedicated integrated module. Fine temperature, zero point, full scale and nonlinear compensation. Realize accurate measurement and transmission of pressure changes in liquid, gas, steam and other media. Realize the ideal monitoring of changes in pressure and vacuum media in various places for enterprises, scientific research institutes and other departments.

Sino-Inst’s pressure sensors are the most commonly used sensors in industrial applications. Widely used in water conservancy and hydropower, railway transportation, intelligent building, production control, aerospace, military industry, petrochemical industry, oil well, electric power, ship, machine tool, pipeline and other industries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a pressure sensor, level sensors, or other equipment, please give us a call.

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Many beginners struggle with sensor/transmitter wiring issues. Worry that the wrong connection will cause damage to the sensor/transmitter and affect the accuracy of the measurement. This article will discuss with you the wiring of pressure sensor/transmitter. Teach you how to deal with the wiring problems of two-wire, three-wire and four-wire sensors/transmitters.

Featured Pressure Transducer for Sale

4-20mA pressure transmitter

4-20mA means that the minimum current is 4mA and the maximum current is 20mA.

The industry generally needs to measure various non-electrical physical quantities, such as temperature, pressure, speed, angle, etc. They all need to be converted into analog electrical signals before they can be transmitted to the control room or display equipment hundreds of meters away. This device that converts physical quantities into electrical signals is called a transmitter. The most widely used in the industry is to use a 4-20mA current to transmit analog quantities.

Because 4-20mA signals are least affected by electrical noise and resistance in the signal line, these sensors are best used when signals must be transmitted over long distances. These sensors are typically used in applications where the lead must be 1000 feet or more.

Extended Reading: strain gauge pressure transducer

“Instrument wire system” refers to the number of wires used for instrument power supply and standard signal transmission.

The name of the wire system is only after the birth of the two-wire transmitter.

This is the result of the widespread application of electronic amplifiers in instruments. The essence of amplification is an energy conversion process, which cannot be separated from power supply.

Therefore, the first appeared is the four-wire transmitter. That is, the two wires are responsible for the power supply. The outer two wires are responsible for outputting the converted and amplified signals (such as voltage, current, etc.).

Extended reading: Pressure Sensor Applications-Featured Industry Applications

2 wire pressure transducer wiring diagram

The wiring of the two-wire transmitter is shown in the figure. Power supply is 24VDC. The output signal is 4-20mA. The load resistance is typically 250Ω. The 24V supply has the lowest negative wire potential. It’s the public point.

The smart transmitter can also load the FSK keying signal of the HART protocol on the 4-20mA signal. Some digital display meters have transmission function or 24V power supply function. The function is similar to that of a two-wire transmitter.

The power supply and current signal loop of the two-wire transmitter are:
The positive terminal of the 24V power supply → the positive terminal of the transmitter → the negative terminal of the transmitter → the positive terminal of the digital display meter → the negative terminal of the digital display meter → the negative terminal of the 24V power supply, the digital display meter receives the current signal.
If a resistor R is connected in parallel with the positive and negative terminals of the digital display. The digital display meter receives the voltage signal.

Extended reading: High accuracy pressure transducers

3 wire pressure transducer wiring diagram

The positive terminal of the power supply of the three-wire transmitter uses one wire. Use a line for the positive end of the signal output. The negative terminal of the power supply and the negative terminal of the signal share a line. as the picture shows. The power supply is mostly 24VDC, and the output signal is mostly 4-20mA.

The power loop of the three-wire transmitter is:
24V power supply positive terminal→transmitter positive power supply wiring V+ terminal→transmitter negative terminal (common terminal)→24V power supply negative terminal.

The current signal loop is:
Transmitter’s current output I+ positive terminal → digital display meter positive terminal → digital display meter negative terminal → transmitter’s negative terminal (common terminal), the digital display meter receives the current signal.

If a resistor R is connected in parallel with the positive and negative terminals of the digital display meter, the digital display meter receives the voltage signal.

Read more about: What Is 0-10V Signal Output?

4 wire pressure transducer wiring diagram

The power supply and signal of the four-wire transmitter use two wires each, and the power supply and the signal work separately. As shown in the figure, most of the power supply is 220VAC, and there are also 24VDC. The output signal is mostly 4-20mA.

The current signal loop of the four-wire transmitter is:
The current output positive end of the transmitter → the positive end of the digital display meter → the negative end of the digital display meter → the negative end of the transmitter, the digital display meter receives the current signal.

If a resistor R is connected in parallel with the positive and negative terminals of the digital display meter, the digital display meter receives the voltage signal.

Extended reading: Troubleshooting For 4-20ma Pressure Transmitter

Pressure Transducer Wiring is actually very simple. Generally, when the pressure transmitter is used and installed, there will be an installation manual, which can be installed directly according to the manual.

Pressure transmitters include capacitive pressure transmitters and resistive pressure transmitters. A pressure transmitter is a device that converts the pressure of a gas or liquid into a usable electrical signal.

The pressure transmitter can be divided into two-wire system, three-wire system and four-wire system according to the wiring method.

The pressure transmitter has two power lines and two signal lines. The power supply is connected to 24v DC. The simple detection method is to use an ammeter or voltmeter to connect both ends of the signal line.

After the pressure transmitter power supply is connected, the ammeter will have 4ma current or the voltmeter will have 0v or 1V voltage. Read more about: What Is 0-10V Signal Output?

The current transmitter generally has 4 terminals. Two are wired. The other two do not need to be wired. The DC24V power line of the transmitter is also a 4-20mA signal feedback line.

That is to say, the AI ​​point of your secondary meter or DAS (data acquisition system) should have a DC24V feed output.

Generally, the 4-20mA pressure transmitter is a 2-wire system, powered by 24V, and outputs a 4-20mA current signal. After the pressure transmitter arrives at the scene, many people do not know how to wire it. This is a very painful and headache.

In fact, when you open the back cover of the pressure transmitter, you will see four terminals. OUT positive and negative and TEST positive and negative. Here we take OUT positive and negative.

TEST positive and negative is the factory, the manufacturer used to calibrate the pressure transmitter. It is not necessary to control the function of the two terminals when using it on site.

Direct OUT positive and negative on the line.

Extended Reading: Fluid pressure sensor

More pressure measurement solutions

Sino-Inst is Manufacturer of Pressure Transducers. We supply more than 100 kinds of Pressure Transducers. 50% 2 Wire Pressure Transducers, 40% 4 Wire Pressure Transducers, and other types of Pressure Transducers.

Sino-Inst’s 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 Pressure Transducers, level sensor, or other device, give us a call.

Request a Quote

Featured High Accuracy Pressure Transducers for Sale

When ordering a pressure transmitter, you can often be asked what accuracy pressure transmitter you need. Then our sales engineer will tell you that we have 0.5% accuracy and 0.1% accuracy. Even higher precision ones can be customized.

Also, different accuracy may affect the price of the pressure transmitter. So what is the accuracy of the pressure transmitter? Do we need to blindly pursue higher-precision pressure transmitters?

Extended Reading: 4-20ma pressure transducer wiring diagram

What is the accuracy of a pressure transmitter?

The accuracy of the pressure transmitter is the same as that of all measurement and display instruments, and it is an indicator of the reliability of the measured value of the instrument.

The instrument has a maximum allowable error (deviation), and the probability of more than 98% of the results obtained from N times of measurements on the same measured value does not exceed this range.

Maximum allowable error / measuring range * % = meter accuracy

For a pressure transmitter with an accuracy of class 0.1,

Output allowable error = output range * instrument accuracy% = 16 * 0.001 = 0.016 (mA)

That is, the maximum possible error when this meter is measured is plus or minus 0.065mA.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Usually, when considering the overall accuracy of the pressure transmitter, the factors that affect the accuracy of the pressure transmitter generally need to be considered.

According to the experience of Sino-Inst, we believe that everyone should choose the tolerance of the pressure transmitter according to the requirements of the industrial process. Instead of selecting according to the pressure transmitter indicators installed in the field.

Extended reading: Water Pressure Sensors for Measurement of Water Pressure

Factors affecting the overall accuracy of pressure transmitters

Read more about: What Are 0-10V Pressure Transducers?

pressure transducer 4-20mA

Many friends have some misunderstandings about this issue, and feel that 4-20mAdc is more troublesome to calculate. So why use 4-20mAdc?

The field two-wire pressure transmitter needs power supply. First, it is necessary to ensure that there is still a certain current in the case of zero position. Then in the design, we found that the minimum starting current of the transmitter is 3.5mA, which means that the transmitter can still work under 3.5mA.

Then if it is 0mA, then there is no power supply and it cannot work.

So use 4mA as the zero position, if it starts at 0mA, the meter will not work. If there is a disconnection in the field, there is no way to tell if it is a problem with the meter or the power supply. Therefore, the international general standard starts from 4mA.

The second question, why is it 20mA? Why not 30mA? Why not 100mA?

It stands to reason that the bigger the better, the higher the resolution, but it is not.

Through the observation of the gas explosion point, it is found that the spark generated when the 20mA is switched on and off will not cause the gas explosion. 20mA is a critical value, so ≤20mA is safe. If >20mA, there will be an explosion problem, so 4-20mA is a better value.

Then there are also some occasions where 0-10mA is used, which is generally not used in the process industry. It may be used in the discrete industry. There are also some occasions where 0.5v-4.5v or 0-5v are used in the discrete industry. Then for the process industry, it is mainly 4-20mA.

Sino-Inst is a pressure transmitter manufacturer, the main products include intelligent pressure transmitter, digital pressure transmitter, high temperature pressure transmitter, sanitary pressure transmitter, compact pressure transmitter, liquid level pressure transmitter transmitter, differential pressure transmitter, etc., the product series is complete, high precision, welcome to inquire!

Extended Reading: Smart pressure transmitter

More Pressure Measurement Solutions

Sino-Inst is Manufacturer of high accuracy pressure transducers. We supply more than 50 kinds of high accuracy pressure transducers. Including diffused silicon, single crystal silicon, capacitive and other types of pressure transmitters.

High accuracy pressure transducers are used in automatic process control pressure measurement of liquid metallurgy, machinery, petroleum, electric power, chemical industry, compressor, light industry, textile, steam, sewage treatment equipment, heat transfer oil, etc.

It has good water resistance, small size, high cost performance and easy installation. The shell is made of stainless steel, which has good sealing, vibration resistance, stable and reliable performance.

Sino-Inst’s High accuracy 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 High accuracy pressure transducer, level sensor, or other device, give us a call.

Request a Quote