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.
How do you test a 4 20ma pressure transducer?
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.
