China Pressure transducer 4-20ma, HART

1151GP Pressure transmitter,is one of our core smart pressure transducer.4-20MA / Voltage Pressure Transducer One kind of our, Current Output, 4 - 20 mA Transmitters

Product Details


Pressure transducer 4-20ma, HART-1151GP

4-20MA / Voltage Pressure Transducer

One kind of our,

Current Output, 4 - 20 mA Transmitters

The signal current of general instrumentation is 4-20mA,

which means the minimum current is 4mA and the maximum current is 20mA.


1151GP Pressure transmitter,

is one of our core smart pressure transducer.


The 1151GP smart pressure transmitter is composed of two parts:

a smart pressure sensor and an intelligent electronic board.

The smart sensor part includes:

a capacitive sensor, a measuring diaphragm detecting circuit,

a temperature sensor and a temperature compensation circuit;

The intelligent electronic board part includes:

a microcomputer controller,

and peripheral circuit composition,

complete the pressure signal to 4 ~ 20mA dc conversion.

Used to measure the pressure of a liquid, gas or vapor,

and then convert the pressure signal into a 4-20 mA DC signal output.

The intelligent pressure transmitter produced by Huaheng,

can communicate with the HART Communicator, set it,

adjust the pressure range, monitor,

or form a field monitoring system with the host computer.

It is widely used in weak corrosive liquids in industrial pipelines. Gas and steam measurement and control systems.


At present, due to various collection needs,

there are many kinds of output signals of pressure transmitters on the market,

4~20mA, 0~20mA, 0~10V, 0~5V, etc.,

but the more used is 4~20mA. And 0~10V two kinds.

Among the output signals, I mentioned above,

only 4~20mA is a two-wire system

(we say that the output is several lines without grounding or shielding line),

and the others are all three-wire system.

absolute pressure transmitterPressure transducer 4-20ma


Pressure Transmitter 4-20mA / 0-10V


With its welded stainless steel housing and various electrical connections,

the 1151GP can be packaged for a wide variety of

OEM pressure transducer applications.

Current Output Pressure Transducers and Transmitters.

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.


Pressure transmitters monitor pressure ranges from vacuum to 5000 psig,

and provide an analog output signal (4-20mA or 0-10VDC).

Ceramic sensing elements provide high burst/overpressure protection,

while stainless steel welded thin-film sensing elements provides very fast response time,

and are useful in many different media sensing applications.


The 1151GP pressure transducer,

is designed with a one-piece stainless steel or nickel alloy sensing element.

This sensing element is free of welds,

O-rings, or fluid-filled cavities,

resulting in long term stability and accurate, repeatable output.

The sensor can be configured with a variety of voltage output signals or 4-20mA loop powered.

Packaged with a stainless steel housing,

various process connection thread choices,

and either cable or connectors,

the pressure transducer can fit many existing designs,

as well as offer flexibility for new designs.


How to test a 4-20ma pressure transducer


Pressure sensors are used in a wide range of applications.

With the wide application of pressure sensors,

it is important to determine how to detect pressure sensors. Detecting pressure sensors, depending on the purpose,

the items to be tested are different, of course, the method of detection will be different.

1, The detection of the bridge,

the main detection sensor circuit is correct,

generally the Wheatstone full bridge circuit,

Using the ohmic file of the multimeter,

the impedance between the input terminals and the impedance,

between the output terminals are the input,

and output impedances of the pressure sensor.

If the impedance is infinite, the bridge is broken,

indicating that there is a problem with the sensor or the definition of the pin is not correct.

2. Detection of zero point,

using the voltage file of the multimeter, detecting that no pressure is applied,

Zero output of the sensor. This output is generally a voltage of mV level.

3, Pressure detection, the method of inspection is:

power the sensor, use the mouth to blow pressure

The air hole of the sensor detects the voltage change at the output of the sensor,

with the voltage gauge of the multimeter.

If the relative sensitivity of the pressure sensor is large,

this amount of change will be significant. If there is no change at all, you need to use a pneumatic source to apply pressure.


4~20mA Sensor signal conditioning solution


The 4~20mA current loop is composed of two parts, the transmitter and the receiver.

The transmitter is generally located at the field end,

the sensor end or the module end,

and the receiver is generally in the PLC and computer,

which is generally in the controller. .

Two-wire 4-20mA circuit application,

the working power supply and signal share one wire,

and the working power is provided by the receiving end.

To avoid 50/60 Hz power frequency interference,

current is used to send signals.

The main problem to consider in a two-wire solution is to determine the number of receivers used.

When there are multiple receivers,

it will require the transmitter to have a lower operating supply voltage.

Another consideration is to reduce the voltage drop at the receiving end of the loop current.


Troubleshooting a 4-20mA Pressure Transducer


When the transducer is still connected to the pipeline,

and control circuit, connect the 24 VDC to the red wire of the transducer.

Next, disconnect the wire form the transducer,

that is connected to the control circuit,

and place the + lead form the digital milliamp meter to the black wire.

Now connect the - lead from the digital milliamp meter to the lead going to the control circuit.

If the transducer provides 4 mA output signal with no pressure applied,

then the sensor is operational.


Troubleshooting a 4-20mA  Pressure Transducer Removed from a Pipeline


This process is a little more complicated than the previous,

because the only instrument that directly measures current is an analog meter.

Once the transducer is powered,

the 4-20 mA flows from the transducer's - terminal that is then connected to the + lead of a digital milliamp meter.

The meter's - lead is then connected to the - terminal of the 24 VDC power supply.

The voltage that is developed in the internal dropping resistor,

is converted to a milliamp value displayed on the meter's screen.

If the milliamp readout is 4 mA with no pressure applied, it's operational.


4-20ma Pressure Transmitter circuit schematic

 4-20ma Transmitter circuit schematic



Pressure Transducers & Sensors


Transducers Direct manufactures a wide range of innovative pressure transducers

(also called pressure sensors or pressure transmitters)

with various analog outputs such as 4-20ma (2-wire) or voltage outputs with a 0-10 volts,

0-5 volts or ratiometric, 0.5-4.5 volts output.

Transducers Direct’s pressure transducers measure in vacuum ranges,

absolute pressure ranges,

compound pressure ranges,

and above atmospheric pressure ranges up to 10K PSI.

Our piezoresistive sensing technology,

and patented digital sensing technology,

allows for product customization,

which makes our pressure transducers suitable for any application.

Product feature of the pressure sensor

1 Adoption of microprocessor enhances its flexibility and function;

2 Have strong self-diagnostic capability;

3 Without mutual effect between zero adjustment and range adjustment;

4 Complete function of remote & local setting and calibration;

5 Two-wire systems, conforming to HART protocol and be capable of uninterrupted output with HART protocol terminal communication;

6 To compensate for temperature and static pressure by adopting digitized compensation technology;

7 Good stability, high accuracy, adjustable damping and good single-track overload ability;

8 Without mechanical drive parts, little maintenance work, strong resistance to vibration;

9 All general parts satisfy to the convenience of maintenance.


You may be interested in types of pressure transmitter.


Product technical performance of the pressure sensor

Using object: liquid, gas or steam

Measuring scope: refer to model & specification table

Output signal: 4~20mA DC Output, overlay HART protocol digital signal (two-wire system)

Power supply: external power supply 24V DC, power supply range 12V~45V


Product temperature range of the pressure sensor      

Electric circuit board work at -40~85℃; 

Sensing element work at -40~104℃ 

Storage temperature: -40~85℃ 

With digital display: -25~65℃ (normal operation)

                                 -40~85℃ (with no damage)

Relative humidity: 0~95%

Overpressure limit: applying 2~5 times of maximum range pressure will bring no damage to transmitter.

Volume variation: be less than 4px3

Damping: time constant is adjustable within 0.2~32.0s.

Starting time: 3s, preheating is unnecessary.


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Workshop Corner:


Product Testing:


Calibration Devices:


Selecting a Pressure Transmitter on China-transmitters.com.

A pressure transmitter,

sometimes called a pressure transducer,

measures pressure and converts those measurements to electronic signals.

Commonly used in industrial process control,

hydraulic and pneumatic systems,

and other mechanical engineering applications,

a pressure transmitter sends signals through an electronic system,

to help monitor pressure levels in equipment for safe and efficient operation.

Considerations when choosing a transmitter include the required output signal,

the pressure range to be measured,

the environment in which the equipment is being used,

and the type of application.

The pressure range measured varies among pressure transmitters,

but some can be adjusted to measure pressure,

in a wider or narrower range than the given range for finer control of the equipment.

Some transmitters are designed to withstand shock, vibration, or high temperatures.

A differential pressure transmitter measures,

and transmits the difference between two pressure points in a system.

Manufacturers and suppliers include Rosemount, Wika, and Foxboro.


Huaheng, China, a pressure transducer 4-20ma manufacturer, and supplier,

offers a comprehensive range of classic 2-wire 4-20mA output transducers,

and transmitters to satisfy not only the process industry applications,

but also any application,

where long cable lengths are required.

Pressure ranges are from 0-1 psi to 0-15,000 psi with inherent repeatability of less than 0.015 %,

And total accuracy of better than 0.1% including linearity,

hysteresis, repeatability and zero/span settings.




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