How to check the pressure sensor circuit failure

We know the importance of the circuit of pressure sensor, the user in the process of use is not failure, in the event of failure, the user should be the way to learn something about checking fault, if they can't solve please contact manufacturer next project is to introduce the pressure sensor circuit fault inspection method, hope you can help to you.

1, the power supply is connected in a given input pressure signal, check the status of voltage of the transmitter output signal. If no output voltage, should first check the power supply voltage is normal; Is in line with the power supply requirements; The power and presence of wrong wiring between transducer and load equipment. If there is no voltage or polarity reverse of transmitter terminals can cause transmitter no voltage signal output. Rule out these reasons, should further check the amplifier board circuit element is damaged; Circuit board connectors for the poor contact, can take compare normal instrument measuring voltage and measure the voltage of fault instrument corresponding comparison method, to determine the fault point, if necessary can replace defective amplifier board. When checking traffic type transmitter, the J type amplifier board should pay special attention should be paid to anti-static measures.

2, turning on the power supply after a given input pressure signal, if the transmitter output is too high ( More than 10 VDC) , or output is too low, Less than 20 VDC) , and change the input pressure signals and adjust the zero point, span screw output has no response. For this type of failure, except the part inspection transducer measuring have sensitive parts without exception, should check the transmitter amplifier board 'oscillation control circuit part of the' work is normal or not. High-frequency transformer T1 - 12 normal peak voltage should be between 25 ~ 35 vp - P; Frequency is about 32 KHZ. Then inspect the amplifier board on the working condition of each operational amplifier. Components of each part is damaged. Such failures need to replace the amplifier board.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor