How to check the quality of pressure sensors
The detection of pressure sensors varies depending on the purpose, and therefore the detection methods will also differ.
1. The detection of bridge circuits mainly checks whether the circuit of the sensor is correct. Generally, it is 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 circuit is disconnected, indicating that there is a problem with the sensor or the pin definition is not correctly determined.
2. Zero point detection, using the voltage range of a multimeter, detects the zero point output of the sensor without applying pressure. This output is usually a voltage in the mV range. If it exceeds the technical specifications of the sensor, it indicates that the zero point deviation of the sensor is out of range.
3. The method of pressure detection and inspection is to supply power to the sensor, blow the air vent of the pressure sensor with the nozzle, and use the voltage range of the multimeter to detect the voltage change at the output terminal of the sensor. If the relative sensitivity of the pressure sensor is high, this change will be significant. If there is no change at all, it is necessary to use a pneumatic source to apply pressure.
By using the above methods, the condition of a sensor can be basically detected. If accurate detection is required, a standard pressure source should be used to apply pressure to the sensor, and the sensor should be calibrated according to the magnitude of the pressure and the change in the output signal. And if conditions permit, conduct temperature detection of relevant parameters.
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