SI-303 Low-Pressure Transducer

Low pressure transducers for air and non-corrosive gases low pressure measurement.

Low pressure transducers for air and non-corrosive gases low pressure measurement.

Low pressure transducers also called low pressure transmitters. Sino-Inst offers High-precision low-pressure pressure transducers. 0 ~ 2.5kPa to 0 ~ 30kPa measurable. Low pressure transducer converts the measured pressure into an accurate electrical signal. This process is achieved through a high-performance amplifier circuit. The unique design of this product makes it unique in terms of environmental resistance. It is less affected by temperature changes. Anti-vibration With good long-term stability. Low pressure tranducers are suitable for applicaitons like: Liquid level. Flood warning. Waste water. Clean room. And open channel flow applications.

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

Description

Sino-Inst SI-303 series high-precision low-pressure pressure transmitters adopt internationally renowned brand sensors. The measured pressure is converted into accurate electrical signals through high-performance amplifying circuits.

The unique design of this product makes it resistant to environmental influences Unique play. Little affected by temperature change. Vibration resistance and good long-term stability. It is extremely suitable for engineering equipment, factory automation control and other fields.

Features of Low-Pressure Transmitter

SI-303 Low Pressure Transducer
  • Low range and high dynamic frequency response;
  • Full stainless steel housing, excellent corrosion performance;
  • Advanced temperature digital compensation function, wide working temperature range;
  • Using piezoresistive diffusion silicon chip. The natural frequency is higher than the piezoelectric dynamic pressure sensor (the natural frequency can reach 400kHz);
  • Good signal-to-noise ratio, high resolution, high signal-to-noise ratio, and strong anti-interference ability;
  • Small size, light weight, complete type, high cost performance;
  • Suitable for high-end measurement industries. Such as chemical explosion experiments, hydraulic engineering and aerodynamic experiments;

Specifications of SI-303 Low-Pressure Transducer

Measurement mediumNon-corrosive, dust-free, dry gas
Measuring range         0 ~ 2.5kPa to 0 ~ 30kPa
Overload pressure1.5 times the range
output signal           4 ~ 20mADC (two-wire system)
0 ~ 5VDC, 1 ~ 5VDC (three-wire system) 
Supply voltage range16 VDC ~ 32VDC (constant voltage)
Standard supply voltage24VDC (constant voltage)
Response time 1.0ms 1.0ms
Operating temperature          -20 ℃ ~ + 85 ℃
Compensation temperature0 ~ 70 ℃
Relative humidity          0 ~ 100% (non-condensing)
Load Resistance        (4 ~ 20mA): R = (U-16) /0.02-RD
Where: U is the power supply voltage and RD is the cable internal resistance 
Sum of linearity, hysteresis, and repeatability errors± 0.2% FS (typical value)
± 0.4% FS (maximum) 
Power ImpactLess than 0.02% / V of the output range
Zero temperature drift± 1.5% FS (± 0.2% level), ± 2% FS (± 0.4% level)
Full-scale temperature drift± 1.5% FS (± 0.2% grade), ± 2% FS (± 0.4% grade)
Long-term stability± 0.25% FS / year
ResolutionInfinite, limited only by output noise
Housing material       stainless steel
Process interfaceM20 × 1.5, M12 × 1
Or special production according to user needs 
Leading methodDirect outlet, aviation plug, Hirschmann plug
Electrical parameters (voltage output type):Circuit: 3 wires
Power supply: 24VDC
Output: 0 ~ 5VDC or 1 ~ 5VDC 
Electrical parameters (current output type):Circuit: 2 wires
Power supply: 24VDC
Output: 4-20mA 

Read more about: Common Units Of Pressure

Applications of Low pressure transducers

What is a low-pressure transducer?

Low pressure transducer is pressure transmitter based on piezoresistive pressure sensor. Low pressure transmitters are suitable for air and non-corrosive gases low pressure measurement.

Low pressure transmitters are suitable formeasuring low-level gauge, differential & absolute pressures. Low pressure transmitters with 4 to 20 mA current output, can measure low pressure below 1 bar (15 psi, 400 inWG or 1000 mbar).

Low-pressure transmitters are used to measure air ventilation pressures in buildings. And small pressure differences between two different locations. Such as clean rooms and laboratories where it is important to prevent air contamination.Low pressure ranges are required to measure small pressure values. Often between two locations where the air is being moved from one place to another.

Low range pressure measurement is required for monitoring and controlling ventilation, and air extraction in office and factory buildings. In building management applications, air movement in large spaces creates very small changes in air pressure. So it is necessary to use highly sensitive measurement devices, which are set to read in inches of water column, mbar, hPa or Pascals.

Read more about: Gas Pressure Transducer-Sensor for Gas Pressure Meaurement

How low-pressure transducers work?

Low pressure pressure transmitters use semiconductor piezoresistive effect and micro-machining technology.

On single crystal silicon wafers, semiconductor processes such as photolithography and diffusion are used to make Wheatstone bridges.

When subjected to external forces, micro-strains are generated. The electric bridge is out of balance. The signal is processed by a high-performance amplifying circuit. Makes the product have the advantages of high accuracy, good repeatability, high reliability, etc.

The circuit and core are all sealed in a stainless steel housing. And a variety of installation interfaces are designed.

For very low pressures, there are other types of transducers available, which are based on other principles. These include Pirani gauge, thermocouple and ionization gauge.

The first two techniques are based on the rate at which heat is loss from a heated filament placed in the low-pressure environment. This heat loss is depended on the number of gas molecules per unit volume.

  • Pirani gauge – This gauge calculates filament temperature by measuring filament resistance. Resistance measurement is measured with the help of a Wheatstone bridge circuit. The relation between the resistance and the applied pressure is highly non-linear.
  • thermocouple – In this type of pressure transducer, a thermocouple is attached to the heated filament to measure its temperature. For the reference temperature in the thermocouple, room temperature is used. The voltage output of the thermocouple varies non-linearly with the gas pressure.
  • Ionization gauge – It is highly useful for measuring very small pressures in the range of 10–3 atm to 10–13 atm. Here, the gas, whose pressure is to be measured, is ionized with the help of a heated filament. The current is measured between two electrodes in the ionized region, which depends on the gas pressure, because the number of ions per unit volume depends on the gas pressure.

Q&A

What is the function of a pressure transducer?

pressure sensor is a device for pressure measurement of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. For the purposes of this article, such a signal is electrical.
More about Pressure sensor Wikipedia.

How does a 3 wire pressure transducer work?

Three-wire system: The three-wire sensor is the separation of the positive terminal of the power supply and the positive terminal of the signal output, but they share a COM terminal.
Use one wire for the positive end of the power supply and one wire for the positive end of the signal output. The negative end of the power supply and the negative end of the signal share one line. Its power supply is mostly 24v.dc, the output signal is 4-20ma.dc, the load resistance is 250ω or 0-10ma.dc, and the load resistance is 0-1.5kω; some also have ma and mv signals, but the load resistance or input The resistance varies with the form of the output circuit. The designation of a few-wire system was only after the birth of the two-wire transmitter. This is the result of the extensive application of electronic amplifiers in meters. The essence of amplification is an energy conversion process, which is inseparable from power supply. So the first to appear is a four-wire transmitter; that is, two wires are responsible for the power supply, and the other two wires are responsible for outputting the amplified signal (such as voltage, current, etc.).
How is a 3 wire 4-20mA pressure transmitter connected electrically?
Example of Sensor Connections:
Volts Input + (Supply positive)
Current Output + (Signal positive)
Volts Input (negative) / Current Output (Supply negative)

How do you hook up a pressure transducer?

Pressure sensors are generally two-wire, three-wire, four-wire, and some are five-wire.
Pressure sensor two-wire system is relatively simple. General customers know how to connect. One line is connected to the positive pole of the power supply. The other line is the signal line connected to the negative pole of the power supply through the instrument. This is the simplest. A wire is added to the wire system. This wire is directly connected to the negative pole of the power supply, which is a bit more troublesome than the two-wire system.
The four-wire pressure sensor must have two power input terminals and the other two signal output terminals. Most of the four-wire system is a voltage output rather than a 4-20mA output. The 4-20mA is called a pressure transmitter, and most of them are made of two-wire system.
Some of the signal output of the pressure sensor is not amplified, and the full-scale output is only tens of millivolts. Some pressure sensors have internal amplification circuits, and the full-scale output is 0 ~ 2V.
As for how to connect the display meter, it depends on the range of the meter. If there is a gear that is compatible with the output signal, you can directly measure it, otherwise you need to add a signal adjustment circuit. The five-wire pressure sensor is not much different from the four-wire system. There are relatively few five-wire sensors on the market.

https://www.drurylandetheatre.com/industrial-process-pressure-transmitters/

Sino-Instrument offers over 10 Low-Pressure Transducers.

About 50% of these are 4-20ma Low-Pressure Transducers. 40% are Differential Pressure Gauge. And 20% are Diaphragm Seal Pressure transmitters. 20% are 4-20ma differential pressure transmitters.

A wide variety of  Low-Pressure Transducers options are available to you, such as free samples, paid samples. 

Sino-Instrument is a globally recognized supplier and manufacturer of 
Low-Pressure Transducers, located in China.

The top supplying country is China (Mainland), which supply 100% of 
Low-Pressure Transducers respectively.

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Low-Pressure Transducers 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.

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SI-350 Sanitary Pressure Transmitter

Sanitary Pressure Transmitter is also called a Hygienic pressure sensor or tri-clamp pressure transmitter. Sanitary Pressure Transmitter is used for food &beverage or pharmaceutical application.

Sanitary Pressure Transmitter, also called tri-clamp pressure transmitter. It is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor. Sanitary Pressure Transmitter uses a flat membrane to directly sense the pressure. The sensor interface is available in clamp type, M27 × 2, and flange type.

The sanitary pressure transmitter is designed especially for the requirements of the food and beverage, pharmaceutical and biotechnology industries.
It is particularly suitable for the special conditions of CIP/SIP cleaning processes. Such as chemical stability towards cleaning liquids and high temperatures

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

Features of Sanitary Pressure Transmitter

SI-350 Sanitary Pressure Transmitter
  • Pressure interface with 316L flat diaphragm structure
  • Hygienic, anti-fouling
  • Wide measuring range for absolute pressure, gauge pressure and sealed reference pressure
  • Good sealing and stable work for a long time
  • With heat sink, high temperature media application performance
  • Output signal can be selected, can be customized according to customer requirements

No Liquid Fill Diaphragm, Sanitary Clamp Fitting

The SI-350 sanitary pressure transmitter uses a flat membrane to directly sense the pressure signal. The diffused silicon pressure core acts as a sensitive component. Standard silicone oil is used as the pressure transmission medium.

The measuring end is made of 316L stainless steel and is specially welded and processed. Compact structure, corrosion resistance, vibration resistance, and wide temperature compensation.

SI-350 Sanitary Pressure Transmitter Type prevents fouling, unsanitary and sticky pressure blocking. Due to the pressure felt directly at the exposed end of the threaded diaphragm. It is particularly suitable for pressure measurement of viscous fluids with hygienic requirements in the medical and food industries.
Widely used in food, medicine, brewing, and other health industries. And stress tests that can scale the measurement medium.

Specifications of SI-350 Sanitary Pressure Transmitter

ModelDescription
350-02Sanitary pressure transmitter, range 0- 10kPa, 300%FS overpressure, 2″ sanitary clamp connection.
350-101Sanitary pressure transmitter, range 0- 20kPa, 300%FS overpressure, 1-1/2″ sanitary clamp connection.
350-12Sanitary pressure transmitter, range 0- 400kPa, 200%FS overpressure, 2″ sanitary clamp connection.
350-22Sanitary pressure transmitter, range 0- 600kPa, 200%FS overpressure, 2″ sanitary clamp connection.
350-32Sanitary pressure transmitter, range 0-1MPa, 200%FS overpressure, 2″ sanitary clamp connection.
350-42Sanitary pressure transmitter, range 0-1.6MPa, 200%FS overpressure, 2″ sanitary clamp connection.
350-52Sanitary pressure transmitter, range 0-2.5MPa, 200%FS overpressure, 2″ sanitary clamp connection.
350-62Sanitary pressure transmitter, range 0-6MPa, 150%FS overpressure, 2″ sanitary clamp connection.
350-72Sanitary pressure transmitter, range 0-10MPa, 150%FS overpressure, 2″ sanitary clamp connection.
Range range -100kPa…0~10kPa…10MPa
Pressure type gauge pressure, absolute pressure, sealing pressure
Power output 4 to 20 mA (12 to 30 VDC)
0 to 5V, 1 to 5V, 0.5 to 4.5V, 0 to 10V (12 to 24VDC)
Accuracy 0.5% FS
Hysteresis and repeatability 0.1%FS
Temperature drift 1.5% FS (@-20 °C ~ 85 °C)
Response time ≤ 1ms (up to 90% FS)
Service life ≥10x 10^6
pressure cycle
Working temperature -20 ° C ~ 85 ° C
Storage temperature -40 ° C ~ 85 ° C
Medium temperature -40~85°C (without heat sink)
-40~150°C (three heat sinks), -40°C~250°C (five heat sinks)
Insulation resistance ≥100MΩ/250VDC
Vibration resistance Sinusoidal: 20g, 25Hz~2kHz; IEC 60068-2-6
Random: 7.5grms, 5Hz ~ 1kHz; IEC 60068-2-64
Protection level IP65
Media compatible with a variety of media compatible with 316L stainless steel
Explosion-proof grade Intrinsically safe explosion-proof ExiaIICT6

Guess You’ll Like: Explosion Proof Pressure Transmitter

Applications of Sanitary Pressure Transmitter

Ideal for applications where sanitary conditions are of high priority (i.e. dairy, food processing, pharmaceutical, etc.)

Medical and health, food, wine, dairy, beverages, etc. thick and easy to block, high hygienic requirements, easy to clean occasions.

Environmentally friendly chemical coatings, polyurethane equipment, paint inspection systems, etc.

Extended reading: Vortex Hygienic Flow Meter

  • Sanitary process applications
  • Food and beverage processing
  • Water processing
  • Dairy processing
  • Pharmaceutical processing

Extended reading: Food grade flow meters for Food & Beverage industry

Drawing of SI-350 Sanitary Pressure Transmitter

Read more about: What is industrial pressure transmitter?

More Featured Pressure Transmitters

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.
SI-303 Low-Pressure Transducer
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ~ 2.5kPa to 0 ~ 30kPa measurable.
SI-703 Flush diaphragm pressure sensor
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.
SI-10 Liquid pressure sensor
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.
SI-503K Gas Pressure Sensor
Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such sensors are also commonly referred to as wind pressure transmitters, exhaust pressure sensors.
SI-702 High Pressure Sensor
High pressure sensor is pressure transmitter designed for high pressure measure&control. 0 ~ 40MPa… 600MPa. M20 × 1.5, G1 / 2 (others are customized according to requirements)
SI-702S Ultra-High Pressure Senors
Pressure sensor for Ultra high pressure applications. Ultra high pressures up to 15,00MPa. 0-2000MPa to 0-7000MPa (customized).Ball head M20 × 1.5, cone head M20 × 1.5.
High-Temperature Pressure Transmitter
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.

Technical Support

Flush diaphragm pressure transducer

Flush diaphragm pressure sensor uses a diaphragm isolation process. Feel the pressure directly with a flat membrane. There is no pressure hole in the test head. There is no clogging of viscous media during the measurement. Adopting flush membrane structure, diffused silicon pressure-sensitive core body, with good moisture resistance and excellent media compatibility. The sensor interface is available in clamp, thread and flange options. The output signal can be selected from voltage, current, and so on. The flush diaphragm of the sensor prevents problems such as scaling, unsanitary and clogging of viscous liquids.

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Steam pressure transmitter

High Temperature Pressure Transducer/Transmitter works for steam and fluid. Temperature: -30 ℃ ~ 160-350 ℃, customized up to 850 ° C. It is possible to fit a stand off pipe, pigtail or other cooling device to reduce the media temperature. If not, High Temperature Pressure Transducer/Transmitter is the best choice. The pressure is transmitted to the sensor through the heat dissipation structure on the transmitter. The high-precision signal processing circuit is located in the stainless steel housing. The sensor output signal is converted to standard output signal, like 4-20mA.

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High pressure transducer

The 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 the 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.

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Pressure Transducer 4-20mA/Voltage

The signal system of 4-20mA and 1-5V output by the pressure transmitter is stipulated by international standards.In the signal circuit, the pressure transmitter is equivalent to a variable resistor. It is connected in series with the power supply, ammeter (indicator), and load resistance (including wire resistance). The function of the pressure transmitter is to change the current in the circuit in the range of 4-20mA by changing its own resistance according to requirements.The pressure acts on the sensor, and the sensitive element deforms. The deformation will cause the resistance or capacitance value to change. And then it will be converted into an analog 4-20mA output by the conversion circuit.

More

https://www.drurylandetheatre.com/industrial-process-pressure-transmitters/

Other Sanitary Instruments

SANITARY BIMETAL THERMOMETER

Sanitary Bimetal Thermometers also called the sanitary thermometer, or tri-clamp thermometer.

Sino-Instrument’s Sanitary Bimetal Thermometers are specially designed for direct insertion into sanitary process applications when a standard thermowell is not specified, or the process environment is not exposed to pressure. 

SI-LWGY Sanitary turbine flow meter

Sanitary Flow Meter, also called sanitary turbine flow meter or Hygienic turbine flowmeter.

The Sino-Instrument sanitary turbine flow meter, food grade flow meter, provides accuracy, versatility, and economy, in measuring a wide variety of food, beverage and pharmaceutical products.

All of Sino-Inst pressure transmitters can work with the AMS TREX!

FAQ

What is pressure transmitter how it works?

Pressure Transmitters are sensors with electrical transmission output for remote indication of pressure. Process transmitters differentiate themselves from pressure sensors through their increased range of functionality. They feature integrated displays, offer high measuring accuracies and freely scalable measuring ranges. Communication is via digital signals, and waterproof and explosion-proof certifications are available. Through connection to diaphragm seals, they are suitable for the harshest operating conditions. Ideal for OEMs, process applications, water processing, and industrial pressure applications.

What is the input of the pressure transmitter?

A pressure transmitter is an instrument that converts pressure variables into a standardized output signal that can be transmitted. And there is a given continuous function relationship between the output signal and the pressure variable (usually a linear function). Mainly used for measurement and control of industrial engineering pressure parameters. Differential pressure transmitters are often used for flow measurement.
There are two types of pressure transmitters, electric and pneumatic. The electric standardized output signals are mainly 0mA ~ 10mA and 4mA ~ 20mA (or 1V ~ 5V) DC signals.

How do you calibrate a pressure transmitter?

If the transmitter is used for a period of time, it may cause a change in metering performance. There will be zero drift and increased measurement error. Therefore, it is necessary to perform regular calibration. The accuracy of the calibrator used for calibration should be more than 3 times the required calibration accuracy. Use the pressure calibrator to input the standard pressure values of 0%, 25%, 50%, 75%, and 100% of the range to the transmitter in the forward and reverse directions. Check whether the current output signal is within the allowable accuracy range. If it is out of tolerance, it needs to be adjusted. The adjustment method is as follows (4 ~ 20mA output):
(1) Input a standard pressure of 4mA with a pressure calibrator. Adjust the ZERO (zero) potentiometer. Make the 4mA current output within the accuracy range.
(2) Input a standard pressure of 20mA with a pressure calibrator. Adjust the SPAN (range) potentiometer. Make the 20mA current output within the accuracy range.
(3) ZERO and SPAN will contain each other. Repeat steps (1) (2) until the current output of 4mA point and 20mA point meets the accuracy requirements at the same time. Then check whether the current output of the 25%, 50%, 75% range points meets the accuracy requirements. The transmitter is qualified if it meets the requirements.

What are the types of pressure transmitters?

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: 
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers
More about Industrial Pressure Sensors

Sino-Instrument offers over 10 Sanitary Pressure Transmitters.

About 50% of these are 4-20ma pressure transmitters, 40% are Differential Pressure Gauge. And 20% are Diaphragm Seal Pressure transmitters. 20% are 4-20ma pressure transducer wiring diagrams.

A wide variety of  Sanitary Pressure Transmitter options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of  Sanitary Pressure Transmitters, located in China.

The top supplying country is China (Mainland), which supply 100% of  Sanitary Pressure Transmitters respectively. 

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Sanitary Pressure 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

SI-300 Pressure Transducer 4-20mA/Voltage

Pressure transmitters convert pressure signal into 4 ~ 20mA DC, 0-5V, 0-10V signal output.

The signal system of 4-20mA and 1-5V output by the pressure transmitter is stipulated by international standards.In the signal circuit, the pressure transmitter is equivalent to a variable resistor. It is connected in series with the power supply, ammeter (indicator), and load resistance (including wire resistance). The function of the pressure transmitter is to change the current in the circuit in the range of 4-20mA by changing its own resistance according to requirements.The pressure acts on the sensor, and the sensitive element deforms. The deformation will cause the resistance or capacitance value to change. And then it will be converted into an analog 4-20mA output by the conversion circuit.

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

The SI-300 4-20mA/Voltage Pressure Transducer, also called pressure transmitter 4-20mA. It is a pressure sensor with 4-20ma/Voltage output.

4-20mA Pressure Transducer can be OEM as differential pressure, explosion-proof, or sanitary, just as you need.Ideal for OEMs, process applications, water processing, and industrial pressure applications.

Features of SI-300 Pressure Transducer 4-20mA/Voltage

SI-300 Pressure Transducer 4-20mA/Voltage
  • Sensor Type : Industrial Pressure Transducers
  • Pressure Range : 0 – 25 to 14000 psi
  • Output/Span : .5 – 4.5 V, .5 – 4.5 V, 1 – 5 V, 1 – 6 V, 10 mV/V, 4 – 20 mA
  • Type : Compound, Gage, Sealed
  • Accuracy : ±0.5% FSO

All of our pressure transmitters can work with the new AMS TREX

Specifications of SI-300 Pressure Transducer 4-20mA/Voltage

Range range -100kPa…0~10kPa…100MPa (14000psi)
Pressure type Gauge pressure, absolute pressure, sealing pressure
Power supply 24V, 12V
Output signal 4~20mA, 1~5V, 0~10V
Working temperature -20 ° C ~ 85 ° C
Medium temperature -20 ° C ~ 85 ° C
Storage temperature -40 ° C ~ 125 ° C
Zero temperature drift ±1.5% FS (@-20°C~85°C)
Sensitivity temperature drift ±1.5%FS (@-20°C~85°C)
Overload pressure 150% FS
Mechanical vibration 20g (20~5000HZ)
Impact 100g (11ms)
Comprehensive accuracy 0.5, 0.3 optional
Insulation 100MΩ /250VDC
Response time ≤ 1ms (up to 90% FS)
Long-term stability ±0.2%FS/year
EMC Surge (IEC61000-4-5) 2KV
EMC static (IEC61000-4-2) contact discharge 8KV, air discharge 15KV
Protection level IP65
Explosion-proof grade Intrinsically safe explosion-proof ExiaIICT4
Material Housing stainless steel; isolation diaphragm 316L
Media compatible with a variety of media compatible with 316L stainless steel

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

Applications of Pressure Transmitter 4-20mA

  • Industrial OEM Equipment
  • Water Management
  • Pneumatics
  • Hydrogen Storage
  • Sub Sea Pressure
  • HVAC/R Equipment
  • Control Panels
  • Hydraulic Systems
  • Data Loggers

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

Drawings of SI-300 Pressure Transducer 4-20mA/Voltage

4-20ma pressure transducer wiring diagram

We offer OEM and Reseller Discounts for all kinds of 4-20mA pressure transducer

4-20ma differential pressure transmitter

The Smart Differential Pressure transmitter is upgraded differential pressure transmitter, which can work with display, HART communicators, and 4-20mA output. SMT3151DP smart differential pressure transmitters can be used for differential pressure measurement.

Diaphragm seals 4-20ma pressure transducer

Diaphragm seals are used to prevent process medium,
from entering into the pressure-sensing assembly of the Differential pressureGauge pressure,
orAbsolute pressure transmitter.

Industrial Pressure Transmitter

Industrial Pressure Transmitter, are precision engineered to fit most industrial pressure measurement applications.
Sino-Instrument can offer industrial pressure transmitters with the display, 4-20ma output,
which can work as a natural gas pressure transducer,
water pressure transmitter, wastewater pressure transducer.

Submersible Pressure Transducer 4-20mA

Submersible pressure transducer with 4-20mA output,
is normal submersible pressure transmitter for level measurement.
Sino-Instrument Hydrostatic submersed level transducers are sensors,
with an electrical transmission output for indication of liquid level.

What is a 4-20mA Current Loop?

The 4-20 mA current loop is a process control signal commonly used in many industries.

This is an ideal method for transmitting process information. Because the current does not change when it flows from the transmitter to the receiver. It is also simpler and cost-effective. However, the number of voltage drops and process variables that need to be monitored can affect their cost and complexity.

By understanding these basics, you will be able to make more informed decisions about process control in your facility. This may affect your bottom line.

In order to understand what a 4-20 mA direct current (DC) loop is and how it works, we need to understand some math. Don’t worry we won’t study any advanced electrical engineering formulas.

In fact, the formula we need is relatively simple:
V = I x R This is Ohm’s law.

This means that the voltage (V) is equal to the current (I) times the resistance (R) (“I” stands for Intensitéde Courant, French for Current Intensity).
This is the basic equation in electrical engineering.
Consider the simple DC circuit above, which consists of one power supply and three loads.
The current loop requires voltage to drive the current. This is powered by the {PART 1} 12 power supply, which is labeled Vtot. Current then flows through the loop through each load. The voltage drop of each load can be calculated according to Ohm’s law.
The voltage drop V1 across R1 is:
Each element in the loop provides a voltage or has a voltage drop. However, currently, everything is the same in the loop.

This is the key principle of the 4-20 mA loop. The current is the same everywhere in the entire circuit.
It may be difficult to understand why the current stays constant, so compare your home’s water supply system.

There is a certain pressure in the water pipes that pushes the water towards the house. Voltage acts in a similar manner as pressure, pushing current through the circuit.
When the faucet in your home is turned on, the water runs down. The flow of water is similar to the flow of electrons or electricity. The ability of pressure to force water through a pipe is limited by the bending and restraint of the pipe. These limits limit the flow in the pipeline, similar to how resistors limit current.

Even if the pressure and voltage drop at various points, the flow through the pipeline and the current through the wires remain constant throughout the system.

This is why the use of current as a method of transmitting process information is so reliable.

Components of a 4-20 mA Loop

Components of a 4-20 mA Loop

1. Sensor
2. Transmitter
3. Power Source
4. Loop
5. Receiver

Why we use the 4 20mA in transmitting signal?

Why is it 4/20 mA?

The reason for using a current signal is that it is less susceptible to interference. And the internal resistance of the current source is infinite. The wire resistance is connected in series in the loop without affecting the accuracy. And it can be transmitted over ordinary twisted pairs for hundreds of meters.

Due to explosion protection requirements, the upper limit is 20 mA: the spark energy caused by a current interruption of 20 mA is not sufficient to ignite the gas.

The reason why the lower limit is not set to 0mA is to detect a disconnection. During normal operation, the value will not be lower than 4mA. And when the transmission line is disconnected due to a fault, the loop current will drop to 0.

Usually, 20mA is used as the disconnection alarm value. There are two more reasons.
One reason is to avoid interference.
Another reason is that the two-wire system uses 4-20 mA of current. That is, the two wires are the signal line and the power line. The 4 mA is used to provide the quiescent operating current of the circuit for the sensor.

Extended reading: Smart Differential Pressure Transmitter

Pressure transmitter 4-20ma price

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

Q&A

What does a pressure transducer do?

A pressure transducer is a device or device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.
A pressure transducer 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.
Pressure transducer is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military, petrochemical, oil wells, electricity, ships, machine tools , Pipelines and many other industries.

How do you test a 4 20ma pressure transducer?

Pressure transducer is a commonly used pressure instrument, which has certain applications in many industries. When a user detects a pressure transducer, the detection items are different depending on the purpose. Of course, the detection methods will be different. I will introduce 3 common methods for pressure transducer detection, and I hope it can help everyone.
1. Pressure test.
The detection method is: power the sensor. Use your mouth to blow the air holes of the pressure sensor. Use the multimeter’s voltage range 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 nothing has changed, you need to use a pneumatic source instead.
Through the above methods, the condition of a sensor can be basically detected. If accurate testing is required, a standard pressure source is required. Apply pressure to the sensor and calibrate the sensor according to the pressure and the change of the output signal. When conditions permit, temperature detection of relevant parameters is performed.
2. Detection of zero point.
Use the multimeter’s voltage range. Detects the zero output of the sensor without applying pressure. This output is typically a mV level voltage. If it exceeds the sensor specifications. It means that the zero deviation of the sensor is out of range.
3. Detection of bridges.
The main test circuit of the sensor is correct. It is generally a Wheatstone full-bridge circuit, which uses the ohm range of a 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 indicates that there is a problem with the sensor or the definition of the pins is not judged correctly.

What is a low pressure transducer?

Low pressure transducers for air and non-corrosive gases low pressure measurement.
Low pressure transducers also called low pressure transmitters. Sino-Inst offers High-precision low-pressure pressure transducers. 0 ~ 2.5kPa to 0 ~ 30kPa measurable. Low pressure transducer converts the measured pressure into an accurate electrical signal. This process is achieved through a high-performance amplifier circuit. The unique design of this product makes it unique in terms of environmental resistance. It is less affected by temperature changes. Anti-vibration With good long-term stability. Low pressure tranducers are suitable for applicaitons like: Liquid level. Flood warning. Waste water. Clean room. And open channel flow applications.
More about low pressure transducer.

What is the difference between transmitter and transducer?

A pressure sensor is a device or device that can sense a pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.
A 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. A pressure sensor is the core part of pressure transmitter.
In a pressure transducer, a thin-film or piezo-resistive pressure sensor is mounted on a process connection. The transducer converts pressure into an analog electronic output signal, typically as a millivolt per volt output. These signals are not linearized or temperature compensated.
pressure transmitter has additional circuitry that linearizes, compensates, and amplifies the signal from a transducer. The different signal types are typically voltage signals (eg, 0 to 5 or 0 to 10 volts), milliamp (eg, 4 to 20 milliamp), or digital. The instrument then can transmit the signal to a remote receiver.

Sino-Instrument offers over 50 pressure transducers 4-20mA/Voltage.

About 50% of these are 4-20ma differential pressure transmitters, 40% are Differential Pressure Gauge, and 20% are Diaphragm Seal Pressure transmitters, 20% are 4-20ma pressure transducer wiring diagram.

A wide variety of pressure transducers 4-20mA options are available to you, such as free samples, paid samples. 

Sino-Instrument is a globally recognized supplier and manufacturer of  pressure transducers 4-20mA, located in China.

The top supplying country is China (Mainland), which supply 100% of 
pressure transducers 4-20mA respectively. 

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Pressure Transducer 4-20mA/Voltage 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.

Current Output, 4 – 20 mA Transmitters

How Does a Pressure Transmitter Work?

What is a pressure transmitter?

A pressure transmitter also often called a pressure transducer. A pressure transmitter is a device used to measure the pressure of liquids or gases in pipes or containers. It works by converting the pressure readings into an electrical signal that can be easily transmitted to a control system for monitoring and analysis.

These devices are commonly used in industrial settings, such as in manufacturing plants and refineries. Where it’s important to monitor the pressure of gases and liquids flowing through pipes and containers to ensure that they’re at safe levels.

Pressure transmitters can measure pressure in gases, liquids, air or oil. Widely used in various industrial processes. Such as pharmaceutical industry, chemical feed, waste water industry, food industry, farms, etc.

Overall, pressure transmitters are essential tools for measuring and monitoring pressure levels in various settings, helping to keep people and equipment safe and functioning properly.

In order to choose a suitable pressure transmitter, we must understand what types of pressure transmitters are there, what are the functions of pressure transmitters, and how do pressure transmitters work? Read on to find out the answers below.

Types of Pressure Transmitters

According to different measurement media, pressure transmitters can be divided into liquid pressure transmitters and gas pressure transmitters.
According to the measurement conditions, the pressure transmitter can have a high temperature type, a very low temperature type, and a high pressure type.
Here we divide by the type of pressure measured.

Type of Pressure TransmitterCharacteristics/Principles
Absolute Pressure Transmitter– Measures pressure relative to atmospheric pressure
– Can only measure positive pressures
Gauge Pressure Transmitter– Measures pressure relative to atmospheric pressure
– Can only measure positive pressures
Differential Pressure Transmitter– Measures the difference between two pressures
– Can measure both positive and negative pressures<br>- Used to measure flow rates
Vacuum Pressure Transmitter– Measures pressure below atmospheric pressure
– Can only measure negative pressures
– Used to maintain vacuum in a process
Hydrostatic pressure transmitters– Often called level transmitters. Because of their working principle and ability to measure level.
– Hydrostatic pressure transmitters work on the basis that the amount of pressure increases with depth.
– These devices are submersible and can be used for liquids and gases.

Featured Pressure Transmitters

Pressure Transmitter Working Principle

A pressure transmitter is a device that measures the pressure of fluids or gases in a process and converts it into an electrical signal that can be used for monitoring or control purposes. There are several different working principles that pressure transmitters use to accomplish this:

One of the main components of piezoresistive pressure transmitters is the resistance strain gauge. It is a sensitive device that converts the strain change on the DUT into an electrical signal.

Usually, the strain gauges are closely bonded to the substrate that generates mechanical strain with a special adhesive. When the stress of the substrate changes, the resistance strain gauge also deforms together. Change the resistance value of the strain gauge, so that the voltage applied to the resistance changes. The transmitter has extremely low price and high accuracy and good linearity characteristics.

Diffused silicon pressure transmitters were introduced in the mid-1990s. It utilizes the piezoresistive effect of elastic elements. When the pressure of the measured medium directly acts on the diaphragm of the sensor, the diaphragm produces a micro-displacement proportional to the pressure of the medium, which changes the resistance value of the sensor. This change is detected electronically. And convert and output a unified standard signal.

Compared with traditional products, this transmitter has the advantages of advanced technology, reliable performance, convenient installation, high accuracy and small size.

Corrosion-resistant ceramic pressure transmitters have no liquid transfer. When the pressure acts on the ceramic diaphragm, the diaphragm will produce a slight deformation. Make the thick film resistor printed on the back of the ceramic diaphragm pass through the Wheatstone bridge (closed bridge) connected to it. Output a voltage signal proportional to the excitation voltage.

The pressure physical quantity is measured through the built-in circuit of the transmitter and converted into a unified standard signal.

The transmitter can introduce various media (corrosive and non-corrosive gases, liquids) directly to the ceramic diaphragm.

The thermal stability of the ceramic and its thick-film resistance allow it to operate over a temperature range as high as -40°C to 135°C.

Therefore, it has high measurement accuracy, good stability, strong output signal and low price.

Piezoelectric pressure transmitters work on the piezoelectric effect.

The crystal is anisotropic, and when a force is applied along a certain direction, the crystal can produce an electric effect. When the mechanical force is removed, it will return to the uncharged state again. The piezoelectric materials mainly used in sensors are quartz, sodium potassium tartrate and ammonium dihydrogen phosphate.

The transmitter is mainly used in the measurement of acceleration and pressure. It has the characteristics of simple structure, small size, light weight and long service life. But it can only be used to measure dynamic stress.

The capacitive pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitance.

When the pressure on both sides is inconsistent, the displacement of the measuring diaphragm is proportional to the pressure difference. Therefore, the capacitance on both sides is not equal.

Through the oscillation and demodulation link, it is converted into a signal proportional to the pressure. Then the pressure physical quantity is measured and converted into a unified standard signal through the transmission circuit.

It has high precision, corrosion resistance, pollution resistance and good stability. It is recognized as an ideal instrument for detecting low vacuum pressure at home and abroad. It is mainly used in various fields of civil industry, and plays a unique role in military industries such as aerospace industry and nuclear industry.

Extended Reading: Smart pressure transmitter

Capacitive pressure transducer

Video source: https://www.youtube.com/embed/QrT8VWxdxwk?rel=0

Read more about: How does a differential pressure transmitter work

Remote Seal Differential Pressure Transmitter
Differential pressure(DP) level transmitter

Pressure transmitter signal output

There are three common signal outputs that pressure transmitters provide: millivolt, amplified voltage, and 4-20mA.

Below is a summary of the outputs and when they are best used.

Millivolt Output:

This type of output signal is a low-level voltage signal that is proportional to the pressure being measured. The signal typically ranges from 0-50mV or 0-100mV, depending on the specific pressure range being measured.

This type of output signal is usually used in applications where the signal needs to be amplified or converted to a different format before it can be used by the control system.

Amplified Voltage Output:

This type of output signal is a higher-level voltage signal that has been amplified to a specific range, such as 0-5V or 0-10V.

The voltage signal is proportional to the pressure being measured and can be used directly by the control system without the need for additional signal conditioning.

Amplified voltage output signals are commonly used in applications where the control system requires a voltage input signal.

4-20mA Output:

This type of output signal is a current signal that ranges from 4mA at zero pressure to 20mA at the maximum pressure being measured.

This type of signal output is popular because it is immune to electrical noise and can be transmitted over long distances without signal degradation.

4-20mA output signals are commonly used in industrial applications where the control system requires a current input signal.

The choice of signal output will depend on the specific requirements of the application, such as the distance between the pressure transmitter and the control system, the required accuracy and resolution, and the environmental conditions.

Extended reading: Pressure indicator transmitters

Read more about: What is industrial pressure transmitter?

How to Choose Pressure Transducer

There are multiple types of pressure transducers for a variety of applications.

Each pressure transducer has different aspects, that will impact how it works and the applications the pressure transducer works best for.

When selecting a pressure transducer, keep these 6 criteria in mind:

  1. Application and measurement type
  2. Pressure range
  3. Process media
  4. Temperature range and installation environment
  5. Accuracy
  6. Output

If you still don’t know how to choose the pressure transmitter, please contact our sales engineers.

how to use a pressure transducer?

Once you receive the pressure transmitter you ordered, you are ready to use it. First, please check the instruction manual configured by the manufacturer. Based on our many years of experience at Sino-Inst, you can start using a pressure transmitter by following these steps:

  1. Confirm parameters: Before use, please confirm whether the model, range, output type (generally 4-20 mA current output or 0-10 V voltage output) and working voltage of the pressure transmitter meet your application requirements.
  2. Check the appearance: Carefully check whether the transmitter is physically damaged and whether the interface is clean.
  3. Installation location: Install the pressure transmitter on the pipe or container that needs to be measured, ensuring that it is installed securely. Usually the pressure interface should be vertical to the ground.
  4. Connect the power supply and output: According to the instructions of the pressure transmitter, connect the power cord and output cord. Current-type transmitters need to be connected in series in the control loop, and voltage-type transmitters need to be connected in parallel on the measuring equipment.
  5. Zero point calibration: Perform zero point calibration in a no-pressure state to ensure that the output of the transmitter is 4 mA or 0 V when there is no load.
  6. Testing and debugging: Turn on the power and gradually increase the pressure. Observe whether the output signal changes linearly with pressure. Adjust settings until the transmitter’s output meets operating requirements.
  7. Record data: Record the output current or voltage value under different pressures. To ensure that the pressure transmitter can accurately reflect pressure changes throughout the entire working range.
  8. Periodic calibration: Check and calibrate the pressure transmitter regularly to ensure its accuracy and stability in long-term operation.

Can a pressure transducer be used to measure volume?

Pressure transducer cannot be used to directly measure volume. Pressure transmitters are used to measure medium pressure.

However, we can also calculate the volume indirectly through measurements from a pressure transmitter. But this requires other parameters.

For example, in a closed tank, if the temperature of the gas can be kept constant. Then measuring the pressure of the gas can be used to calculate the volume of the gas. This is based on Boyle’s law, which states that the pressure of a gas is inversely proportional to its volume.

Or, in some liquid tanks, if the tank is regular, then we can calculate the cross-sectional area of the tank. Then by measuring the pressure at the bottom of the container, we can calculate the volume of the liquid. Our volumetric recorders also enable this conversion.

Our Pressure Transmitter Markets and Applications

Pressure Transducer Price

There are a number of factors, that will impact the price of a pressure transducer.

The biggest differentiator is whether you can use a standard, off-the-shelf pressure transducer or if you need a custom pressure transducer.

For an off-the shelf pressure transducer, pressure transducer prices will be most affected, by the level of accuracy required for your application.

The more accurate, typically the more expensive the pressure transducer.

Extended reading: What is a pressure sensor?

Choose the right pressure transducer for your application

Sino-Inst offers over 20 Pressure Transmitters. A wide variety of  Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of 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-390 General Purpose Industrial Pressure Transducer

Industrial pressure transducers are essential devices in various industrial processes. They are designed to convert a liquid or gas(air) pressure into an electrical signal, which can be used to measure or control different industrial applications. SI-390 General Precision Industrial help improve the efficiency and reliability of various industrial processes. Support OEM.

Features of SI-390 Industrial Pressure Transducer

  • Compact structure and easy installation.
  • Advanced diaphragm / oil-filled isolation technology.
  • High stability and high reliability.
  • Resistant to vibration and radio frequency interference.
  • 316L stainless steel isolation diaphragm structure.
  • High precision, all stainless steel structure.
  • Miniature amplifier, voltage and current signal output.
  • Strong anti-interference and long-term stability.
  • Forms and structures are diversified and easy to install and use.
  • Wide measuring range, which can measure absolute pressure, gauge pressure and sealed vacuum pressure.
  • Resistant to vibration and shock.
  • Zero and full range can be adjusted.

Specifications of SI-390 Industrial Pressure Transducer

  • Measuring medium: various liquids, gases or vapors compatible with 316L stainless steel
  • Measuring range: -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa
  • Overload: 1.5 times full scale pressure or 110 MPa (minimum value)
  • Pressure type: gauge pressure, absolute pressure, sealed reference pressure
  • Power supply: 15~30VDC 15~28 VDC 15~28 VDC
  • Output signal: 4~20mADC 0~10/20 mADC 0/1~5/10VDC
  • Transmission method: two-wire system; three-wire system; three-wire system:
  • Accuracy: Typical: ±0.25% FS Maximum: ±0.5% FS
    • (including nonlinearity, hysteresis, and repeatability)
  • Long-term stability: Typical: ±0.1%FS Maximum: ±0.2%FS
  • Zero temperature coefficient: 0.03% FS / ° C (≤ 100kPa) 0.02% FS / ° C (> 100kPa)
  • Full temperature coefficient: 0.03% FS / ° C (≤ 100kPa) 0.02% FS / ° C (> 100kPa)
  • Working temperature: -30~ 80°C
  • Storage temperature: -40~100°C
  • Load resistance: ≤ (U-15) / 0.02Ω
  • Electrical connection: cable connection, aviation hoe, Hessmann components
  • Housing material: stainless steel 1Cr18Ni9Ti
  • Process interface: M12×1 N20×1.5 or G 1/4 external thread
  • Protection level: IP65
  • Explosion-proof mark: ExiaIICT6 (intrinsic safety explosion-proof type)

Drawings of SI-390 Industrial Pressure Transducer

What is the pressure transducer?

Pressure transducer/transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission.

It can convert the gas, liquid and other physical pressure parameters felt by the load cell sensor into a standard electrical signal (such as 4-20mADC, etc.). Use secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process adjustment.

Industrial Pressure Transmitters are precision-engineered to fit most industrial pressure measurement applications. Sino-Instrument offers industrial pressure transmitters with the display, 4-20ma output.

The industrial pressure transmitter can work as a natural gas pressure transducer, water pressure transmitter.

The piezoresistive pressure transmitter uses an advanced micromechanical etching process. By diffusing four high-precision resistors with temperature compensation on the silicon wafer. Form a Wheatstone bridge. Due to the piezoresistive effect, the resistance values ​​of the four bridge arm resistors change. The bridge is out of balance. The sensitive element outputs an electrical signal corresponding to a pressure change. The output electrical signal is amplified by the compensation of the non-linear correction circuit to generate a voltage and current signal that has a linear correspondence with the input pressure.

It uses a programmable KELLER-ASIC chip called a “programmable resistor.” The “programmable resistance” chip allows the transmitter to be installed and calibrated with automatic test equipment to improve product quality and reduce costs.

The transmitter uses 6SC series bellows. The piezoresistive silicon pressure sensor is housed in an oil-filled capsule. The dielectric voltage is isolated by the stainless steel diaphragm and transmitted to the wafer through the oil-filled liquid.The sealed pressure gauge has a TAB (Automatically Insulated Tape) sensor. The sensor floats freely in oil to ensure stability and durability.The “programmable resistor” line has a network of programmable resistors. The network adjusts the zero / gain and temperature coefficients.

All SI-390 series transmitters undergo pressure and temperature cycle compensation test procedures. At the end of the compensation test, various parameters are automatically calibrated. And adjusted by computer-controlled test equipment. A final inspection is then carried out and results are obtained. Check if it is correct. The adjustment position is correct and meets the requirements.

The transmitter is very reliable and economical. It is suitable for process control and pressure measurement in petroleum, chemical, metallurgy, power, light industry, textile, building materials, hydrogeology, food, medicine, environmental control, papermaking, and other industries.

SI-390 Industrial Pressure Transmitter is used for process control in the petrochemical, chemical and HVAC industries. They allow measurement results to be transmitted to the control center.The compact, rugged design makes these instruments suitable for a variety of applications. Including hydraulic and pneumatic, vacuum, test equipment. Level measurement, pressure control, compressor control, pump protection and many other processing and control operations. A wide range of electrical and process connection options can meet almost all requirements.

  • Hydraulics and pneumatics
  • Test equipment
  • Pump and compressor control
  • Liquid level measurement
  • Off-road equipment
  • Compressor control
  • Industrial engines
  • Industrial refrigeration

These types of transducers are also known as pressure transmitters.

Since a 4-20mA signal is least affected by electrical noise and resistance in the signal wires, these transducers are best used when the signal must be transmitted long distances. 

It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.

Extended reading: How to calibrate HART pressure transmitters

How to choose the right industrial pressure transducer?

Pressure transmitters are pressure sensors whose electronics can generate measurement signals. The signal can be remotely transmitted via cables, buses or radio frequency.

Consider the unit’s measurement range and maximum pressure capacity, it’s precision, its operational environment (temperatures, vibrations, etc.), the nature of the measured medium and the type of output signal.

  • 1. In order to ensure the stable operation of the product,
    • it is recommended to consider the actual pressure value,
    • and the range of possible migration when selecting the measurement range.
    • The maximum pressure should be within the measurement range,
    • and the company will complete the migration before leaving the factory.
  • 2. The product is installed vertically on the field pressure interface, and the display level is facing the observer.
  • 3. For transmitters with zero pressure and negative pressure, please indicate the range of the range in the order.
  • 4. Intrinsically safe explosion-proof products are limited to products with a pointer head.
  • 5. Qiping diaphragm type transmitter measurement range is 0 ~ 70kPa … 35MPa.
  • 6. When M3 is selected, the ambient temperature range of the transmitter is -20~60°C;
    • when M4 is selected, the ambient temperature range of the transmitter is -30~70°C.

Want to know more about pressure transmitter?

This video gives you the answers to your basic questions about pressure and pressure transmitters.

More Related Industrial Pressure Sensors

More Industrial Pressure Transducer Applications and Markets

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Pressure transmitter calibration is what you need to do before you install the pressure transmitters. Also called pressure transducer calibration,…

Frequently
Asked
Questions

Pressure transmitter types:

  • According to the working principle: it can be divided into capacitive, piezoresistive, resonant, etc. (resonant pressure transmitters can directly output digital pulse signals without going through the signal processing circuit);
  • According to the wiring method: it can be divided into a two-wire system, a three-wire system (one positive power line. Two signal lines, one of which is GND), a four-wire system (two positive and negative power lines, two signal lines, among them One GND), etc.;
  • According to the output mode: it can be divided into a voltage output, current output, digital signal output, etc.;
  • According to the pressure measurement range: it can be divided into general pressure transmitter (0.001~35MPa), micro pressure transmitter (0~1.5kPa), negative pressure transmitter (0~-100kPa), etc.;
  • According to accuracy: can be divided into high accuracy transmitter (0.1% or 0.075% level) and general transmitter (0.5% level);

Pressure transmitters are widely used. Typical examples are constant pressure water supply, pipeline monitoring, hydraulic systems, automated testing, etc. Used for air pressure, hydraulic, oil pressure testing. There are many users who cooperate with us. We The engineers have accumulated rich field experience.

Sino-Instrument offers 10 Industrial Pressure Transducer products.

These are wireless pressure transmitters, pressure transmitter with display, and water pressure transmitter. A wide variety of Industrial Pressure Transducer options are available to you, such as free samples, paid samples.

The top applying countries are China (Mainland), Hong Kong, and the United States, which supply 96%, 2%, and 1% of wireless pressure transmitter respectively.

Industrial Pressure Transmitter products are most popular in North America, Domestic Market, and South America.

Sino-Inst is a company that designs and manufactures OEM pressure transducers and transmitters featuring various pressure sensor technologies to tailor designs to individual applications.

Our Indutrial pressure transducers are available in various pressure ranges with customized and electrical or pressure connections, as well as analogue and digital interfaces. Contact us today for a standard product quotation or to discuss a custom solution.
Contact Sino-Inst for a standard product quotation or to discuss a custom OEM solution.

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SI2088-W Wireless Pressure Transmitter

Wireless Pressure Transmitter is often used for outdoor pressure measurement. Battery-Powered Self-Contained Pressure Monitoring Solution.

Wireless Pressure Transmitter is based on GPRS mobile network or NB-iot IoT transmission. Powered by solar panel or 3.6V battery, or wired power supply. NB-IOT / GPRS / LoraWan and eMTC, a variety of networks are available. , Full-scale compensation, high-precision and high-stability amplifier IC temperature compensation function. The medium pressure can be measured as 4 ~ 20mA, 0 ~ 5VDC, 0 ~ 10VDC, 0.5 ~ 4.5VDC and other standard electrical signals. There are many ways to connect product processes and electrical connections, which can best meet the needs of users.

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

Features of SI2088-W Wireless Pressure Transmitter

SI2088-W Wireless Pressure Transmitter is a lithium battery-powered digital pressure gauge with wireless data transmission. The built-in high-precision pressure sensor can accurately display the pressure in real time. It has high stability and long-term stability.

This digital pressure gauge is equipped with a large-size high-definition LCD liquid crystal display and a built-in MCU. With the mature GPRS / LTE / NB-IoT network, the pipeline pressure on the spot is uploaded to the data center.

The product adopts a cast aluminum shell with good shock resistance. The built-in SUS630 stainless steel diaphragm has good media compatibility. It can measure gases, liquids, oils and other non-corrosive media to stainless steel.

The product function is practical, the reporting frequency can be set. The pressure collection frequency can be set. It has a real-time pressure alarm function. Once the pressure is abnormal, the alarm data can be sent in time. The alarm pressure value can be set. Two consecutive detections exceed the set value and the detection frequency is automatically increased At the same time, the amount of change will be detected. After the amount of change exceeds 10% of the total range (default, can be set), the data will be reported immediately.

In addition, it also has a variety of pressure unit switching, error clearing, and one-key wake-up functions. It is especially suitable for unmanned, inconvenient power supply, such as fire pipelines, fire terminals, fire pump rooms, and urban water supply, which require remote monitoring.

SI2088-W Wireless Pressure Transmitter
  • Five-digit LCD display, visual key operation
  • Remote parameter setting, panel parameter setting
  • Ultra-low power consumption design, powered by 7.2V lithium battery.
  • Using GPRS / LTE / NB-IoT network, stable signal
  • One key to wake up
  • High precision, full range coverage
  • Message format can be customized (default Modbus_RTU protocol)

Sino-Inst provides products that can replace Rosemount 3051S wireless pressure transmitter. Sino-Inst also provides maintenance and calibration of Rosemount and WIKA pressure measurement products.

Specification Wireless pressure transmitter

Pressure Range: -100kPa ~ 60MPa
Pressure type:Sealed gauge pressure / absolute pressure / differential pressure
Accuracy:± 0.2 ~ ± 0.5% FS
Display: 5 digit LCD display, white backlight
Network standard: GPRS / NB-IOT / LoraWan wireless signal transmission (customized according to demand)
Skyline: External
Sampling interval: It can be set arbitrarily, in seconds, if it needs real-time collection, set to 0
Upload interval: It can be set arbitrarily, in minutes, the fastest is 1 minute, if you need to set it to 0
Wake-up mode: timer, button, alarm wake-up
Configuration mode: local configuration / remote configuration
Upload information: data of each channel, battery information, network status, self-test status, signal strength, alarm information, etc.
Power supply: 3.6V@13Ah section X2
Power consumption: standby current ≤50uA, sending average current ≤100mA
Working temperature: -20 ℃ ~ 70 ℃
Storage temperature: -40 ℃ ~ 85 ℃
Vibration: ≤3g / 10Hz … 150Hz (IEC 60068-2-6-2007)
Protection level: IP67
Pressure-sensitive diaphragm: Stainless steel 316L
Shell material: 304 steel joint + aluminum alloy shell
Installation method: Vertical and horizontal installation

Battery operated wireless pressure transmitter

The wireless pressure transmitter sensor is a battery-powered low-power / wireless digital output digital pressure gauge.

  • Low power consumption design. 3.6V / 7.2V lithium battery can be selected for power supply (ER34615M is recommended).
  • It can report 70,000 times during NB-IoT communication. Battery-powered, ultra-low power operation. Battery life reaches 2-5 years (affected by upload interval time).

Drawings of SI2088-W Wireless Pressure Transmitter

How Wireless Pressure Transmitter Works ?

Install the wireless pressure transmitter on the pipeline.

When the medium in the pipeline acts on the sensitive element, it is pressed.

Its internal circuit detects an electrical signal proportional to the process pressure.

After the signal is accurately amplified and compensated by the linear amplifier circuit.

Enter the microprocessor to measure, process and display data.

And wirelessly transmit the measurement data to the remote terminal equipment.

The wireless pressure transmitter adopts the wireless remote transmission module added on this basis. It can form a pressure acquisition system with our intelligent wireless receiving terminal.This system changes the transmission mode and switching power supply mode of RS485 and 4-20mA in the industry. It uses 3.6V lithium battery power supply. This simplifies the installation and saves the cost of customer wiring. The purpose of environmental protection. The product is widely used in various industrial pressure measurement systems. Such as oil fields, power, petrochemical and some occasions where wiring is inconvenient.

Applications of SI2088-W Wireless Pressure Transmitter

Wireless pressure transmitters are suitable for measuring non-viscous liquids, vapors and gases, etc.

  • Fire water pipe network
  • Heating
  • Smart Water
  • Medical equipment
  • Other occasions requiring wireless pressure monitoring
  • Advanced HVAC Systems
  • Hydraulic / Pneumatic Systems
  • Agriculture Equipment
  • Energy Generation and Management
  • Pool / Spa Pump Monitoring

Wireless hydrostatic level transmitter

The battery operated hydrostatic level transmitter integrates the functions of liquid level acquisition, wireless reporting and local digital display.

The construction of the wireless liquid level transmitter is simple and ready to use. It is mainly suitable for places where power is not available on site and remote data transmission is required. It can be widely used in liquid level monitoring in urban water supply and drainage, sewage treatment, hydrology and water resources, fire protection, industry and other fields.

Of course, the wireless pressure transmitter can also be customized on other instruments. Such as wireless differential pressure transmitter, wireless absolute pressure transmitter, wireless temperature transmitter, wireless liquid level transmitter, etc.

Wireless Pressure Transducer
Submersible Pressure Transducer
Hydrostatic Level Sensor
Anti-corrosive Submersible Level Transmitter

Wireless Pressure Transmitter Price

Wireless Pressure Transmitter Price will cost more than ordinary pressure transmitters.

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

Extended reading: How to calibrate HART pressure transmitters

The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of wireless pressure transmitter, offer you with the best price.

Sino-Inst offers 5 wireless pressure transmitter products. These are wireless pressure transmitters, wireless differential pressure transmitter, and wireless temperature transmitter.

A wide variety of wireless pressure transmitter options are available to you, such as free samples, paid samples. Sino-Inst is wireless pressure transmitter manufacturer, located in China.

Wireless pressure transmitter products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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Pressure Transmitter Calibration

Pressure transmitter calibration is what you need to do before you install the pressure transmitters. Also called pressure transducer calibration, or pressure sensor calibration.

In this article, we will share pressure transmitter calibration using hart communicator.

Pressure transmitters used in the process industries are very durable and reliable instruments.

Even so, they still require periodic maintenance and calibration to ensure optimal performance.

Before we start to calibrate the pressure transmitter, we should know:

What is span in pressure transmitter?


Fig. showing span and zero adjustment

Span value:
The difference between two minimum value and maximum value of readings is known as a span value.

As shown in fig. below span = 20mA – 4mA

Zero Value:
The value of readings at zero lines (Y-axis) is known as zero value as shown in the figure.

How Often Should You Calibrate a Pressure Transmitter?

Pressure transmitters require regular maintenance and calibration to ensure optimum performance.

There are no specific rules for the calibration of pressure transmitters. However, this depends on the regulations the company must comply with and the purpose of the calibration. Examples include safety specifications, application requirements, process conditions or as part of standard maintenance.

General industry practice is to calibrate pressure transmitters every 1 to 3 years based on the above conditions.

If it is found that there are obvious errors, or it is more important, the calibration cycle can be shortened.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

how to calibrate a 4-20mA pressure transmitter

Once you have established the calibration interval and MPE, you are ready to perform the actual calibration procedure on your pressure transmitter.

The best-practice recommendation is:

  1. Mount the transmitter in a stable fixture free from vibration or movement.

  2. Exercise the sensor or membrane before performing the calibration.

    This means applying pressure and raising the level to approximately 90 percent of the maximum range.
    For a 150 psi cell that means pressurizing it to 130–135 psig. Hold this pressure for 30 seconds, and then vent.
    Your overall results will be much better than if you calibrate “cold.” cent of the maximum range.
    For a 150 psi cell that means pressurizing it to 130–135 psig.
    Hold this pressure for 30 seconds, and then vent.
    Your overall results will be much better than if you calibrate “cold.”

  3. Perform a position zero adjustment (zero the transmitter).

    This is important because the orientation of the fixture used for calibration may be different than the way the transmitter is mounted in the process.
    Failing to correct for this by skipping this step can result in nonconformance.
    You may like:
    Magnetostrictive level transmitters
    Magnetostrictive level sensor

  4. Begin the Pressure Transmitter Calibration procedure.

    Typically this means three points up (0 percent/50 percent/100 percent) and then three points down.
    The 4–20 mA output should be 4 mA, 12 mA, and 20 mA at the three points (or the correct digital values for a smart transmitter).
    Each test point should be held and allowed to stabilize before proceeding to the next.
    Normally that should take no more than 30 seconds.
    You can use more points if you require higher confidence in the performance of the instrument.

  5. Compare the results of your pressure transmitter to your reference device.

  6. Document the results for your records.

Pressure transmitter calibration formula

There is a formula that we can easily use to convert most (or all) units utilizing 4 to 20 mA signal to mA units.

There are others out there but this is the simplest I know.

Below is a simple formula for pressure to current conversion. 

For example:

the range is :  0 to 10 Bar

Full range = 10 Bar

Displayed or measured value:  7 Bar

15.2 mA is the equivalent current value of a 7 Bar pressure.

(Read more about: Common Units Of Pressure

For Value or range which is not starting with zero ( with a vacuum range), use below linear interpolation formula. 

You can also encode this to excel for easier conversion.

If you want to know and calculate the error,

Just subtract the True value with your computed value.

Error = Measured Value – True Value.

If the Pressure Transmitter has an accuracy of 0.5% of the range,

then 0.005 x 7= +/-0.035 Bar,

you can use this as the tolerance to determine a pass or fail result.

Or you can ask the user for their respective tolerances.

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

How to calibrate pressure transmitter with hart communicator

Equipment required for Pressure Transmitter Calibration

Pressure transmitter, multimeter, HART communicator

The basic procedure for Pressure Transmitter Calibration

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

Read more about HART Pressure Transmitter

If the transmitter is the analog transmitter

  1. Apply 0% pressure as per LRV with handheld test pump and check multimeter if it is not 4ma adjust the zero pot in the transmitter and correct transmitter output to 4ma
  2. Apply 100%pressure as per the URV and correct 20ma in multimeter by adjusting span pot in the transmitter
  3. Repeat these steps to rectify the error.

In case of SMART Transmitter

  1. We have to use HART communicator, connect the communicator with the transmitter select the HART Communicator Menu for lower range value trim and upper range value trim.
  2. Basic Set up – Calibration – Zero Trim/Sensor Trim —Lower/Upper range value trims.
  3. HART communicator will automatically calibrate the transmitter.
  4. Restore the process connection
  5. Take the transmitter on line. Ensure there is no leak  

a small example of five-point calibration is given below

Low range value=0psi

upper range value=200psi

This calibration can work for Rosemount 3051 calibration.

Preparing for Field Calibration of Differential Pressure Transmitters

The usual practice is to disassemble the joint of the pressure guiding tube and the differential pressure transmitter, and then connect to the pressure source for calibration. It is troublesome and labor-intensive. The most worry is that there will be leakage or the pressure guiding pipe will be broken when disassembling and assembling the joint.

No matter what type of differential pressure transmitter, the positive and negative pressure chambers have exhaust, drain valves or cocks. This provides convenience for on-site calibration of the differential pressure transmitter, so that it can be calibrated without removing the pressure guiding tube. Differential pressure transmitter.

But make a fitting with the same thread as the vent, drain valve or cock.

When the differential pressure transmitter is calibrated, first close the positive and negative valves of the three-valve group. Open the balance valve, and then loosen the exhaust and drain valves to vent.

Then use a self-made connector to replace the vent, drain valve or cock connected to the positive pressure chamber.
The negative pressure chamber is kept unscrewed, allowing it to vent to the atmosphere.

The pressure source is connected with the self-made joint through the rubber tube. Close the balance valve. And check the air circuit sealing.

Then connect the ammeter (voltmeter) and the hand-operated communicator into the differential pressure transmitter circuit, and start the calibration after power-on and preheating.

Field Calibration of Conventional Differential Pressure Transmitters

First adjust the damping to zero state, first adjust the zero point. Then add full pressure to adjust the full scale, so that the output is 20mA. The adjustment should be fast in the field. Here is a quick adjustment method for zero point and span.

When the zero point is adjusted, it has almost no effect on the full scale, but when the full scale is adjusted, it has an effect on the zero point. When there is no migration, the effect is about 1/5 of the range adjustment amount, that is, the range is adjusted upward by 1mA. The zero point will move upward by about 0.2mA ,vice versa.

E.g:
The input full scale pressure is 100kPa, the reading is 19.900mA.
The range-adjusting potentiometer makes the output 19.900+(20.000-19.900)×1.25=20.025mA, and the range increases by 0.125mA. Then the zero point increases by 1/5×0.125=0.025, and the zero-point potentiometer makes the output 20.000mA.

After the zero point and full scale adjustment are normal, check the middle scales, and make fine adjustments if they are out of tolerance. Then carry out the adjustment work of migration, linearity and damping.

Smart Differential Pressure Transmitter Field Calibration

The intelligent differential pressure transmitter is between the input pressure source and the output 4-20mA signal. In addition to machinery and circuits, there is also a microprocessor chip that operates on the input data.

Therefore, the field calibration method of intelligent differential pressure transmitter is different from that of conventional differential pressure transmitter.

Read more about: Static Pressure Vs Dynamic Pressure Vs Total Pressure

The differential pressure liquid level transmitter has been calibrated according to customer requirements in terms of range, accuracy, linearity and other parameters. And mark the range, accuracy, etc. on the nameplate of the differential pressure liquid level transmitter. As long as the parameters such as the density of the measured medium meet the requirements of the nameplate, there is usually no need to adjust.

If the customer needs to adjust the span or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0~10 meters:

  1. Unscrew the back cover of the differential pressure liquid level transmitter, connect an external standard 24VDC power supply and an ammeter (requires an accuracy of 0.2% or higher) to adjust.
  2. When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero point potentiometer so that the output current is 4mA.
  3. Pressurize the differential pressure liquid level transmitter to the full scale (10 meters). Adjust the full-scale resistor so that the output current is 20mA.
  4. Repeat the above steps two or three times until the signal is normal.
  5. Please input 25%, 50% and 75% respectively to check the deviation of the differential pressure liquid level transmitter.
  6. For non-water media, when the differential pressure liquid level transmitter is calibrated with water, it should be converted according to the pressure generated by the actual use of the medium density. For example, when the density of the medium is 1.3, the 1.3m water level should be used to calibrate the 1m range.
  7. After adjustment, tighten the back cover.
  8. The calibration cycle of the differential pressure liquid level transmitter is once a year.
  9. The HART intelligent differential pressure liquid level transmitter of Sino-Inst can be selected, which is convenient to adjust the range of the differential pressure liquid level transmitter.

Learn more about Pressure Transmitter Calibration

When you buy a pressure transmitter, for example, you have the instrument range, which is the pressure range the device can support.

This range covers the overpressure that might occur in the device.

The measuring range covers the values where the transmitter works properly, omitting the overpressure zone.

The lower range limit (LRL) and upper range limit (URL) define this range.

Inside the measuring range, you’ll find the calibration span, the range in which your device will be working, depending on your application.

The calibration span covers the difference between your upper range value (URV), the maximum value your transmitter can read, and the lower range value (LRV), the minimum value the device can read.

So there you go!

You should also know that each instrument has a minimum and maximum calibration span it can support.

If you go below or over these limits, you’ll lose accuracy in your readings.

Make sense? Let me give you an example, just to make it clearer.

Let’s say you want a pressure transmitter with a measurement range of -100 to 200 kilopascals (kPa).

This device can measure pressures as low as -100 and as high as 200 kPa.

If your application just requires pressure between -20 to 50 kpa, then this will be your calibration range.

Your calibration span is the URV-LRV.

By the numbers: 50 – (-20) = 70 kPa.

Therefore, you get a calibration span of 70 kPa, which falls inside the span range (10 to 200 kPa).

A pressure transmitter or pressure sensor is a device that measures pressure in a liquid, fluid, or gas. 

Pressure transmitters are commonly used to measure the pressure inside of industrial machinery, in order to alert the user before a catastrophe occurs.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Yes, pressure transducers require calibration.
Pressure transducers are used in many applications to provide accurate, real-time data on how systems work. Calibration is critical to maintaining the accuracy of pressure sensors. And it’s not a one-time process.

If the sensor deviates from its specified pressure range, it may cause erroneous pressure readings. This results in degraded device performance and possible security issues.

Calibration allows users to be completely confident that their pressure transducers are performing correctly and accurately measuring the desired pressure range.

If you cannot find an answer to your question in our Pressure Transmitter Calibration you can always contact us and we will be with you shortly.

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Conclusion:

It is normal for the pressure transmitter to have a certain error. But if the error is too large, it needs to be calibrated. There are two types of Pressure Transmitter Calibrations: conventional method and intelligent calibration. no matter where
Kinds of preparations must be done before calibration, and then calibrate and debug through the handheld operator.

There are no mandatory fixed requirements for Pressure Transmitter Calibration. Generally, enterprises can formulate them by themselves. Normally, they can be calibrated once a year. Crucially, the calibration cycle can be shortened.

About how to calibrate the pressure transmitter, and what needs to be paid attention to during the process of Pressure Transmitter Calibration. If you still have questions, please feel free to contact our engineers.

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