Capacitive transmitters are widely used in petroleum, chemical, metallurgy, electric power, food, paper, medicine, machinery manufacturing and other industries. The product is based on the capacitance dust level measurement principle for the probe and the conductive liquid to form a capacitor, in which the metal core of the probing line is a pole of the capacitor, the conductive liquid is the other pole of the capacitor, and the middle is a high stability poly. Tetrafluoroethylene, the insulating outer layer of the probe wire, serves as the medium between the two electrodes. With the change of the liquid level, the area of ​​the liquid surrounding the probe wire changes, and the relative area of ​​the two electrodes constituting the capacitor changes, resulting in a change in capacitance. .
    Capacitive transmitter on-site troubleshooting methods:
    1. The transmitter output signal is unstable or the output is zero
    When presenting this situation, it should be considered: the pressure source itself is not stable; the degree of the appearance or pressure sensor is resistant to disturbance; the sensor wiring is not normal; the sensor itself oscillates and the cause of the malfunction; the polarity of the power supply is reversed.
    2. mA reading is high or low
    At this moment, you need to check the degree of pressure variable; perform 4-20mA output adjustment.
    3. The transmitter does not return to zero after the input pressure has no response or pressure relief
    Check the transmitter's power supply voltage, verification equipment and setpoints (4mA and 20mA points); see if the pressure interface is leaking or may be blocked; check the wiring method and power supply, if the normal in the sensor zero sensor output , Perhaps a simple pressurization to see if the output is not changed, there is a change to prove that the sensor is not damaged.
    4. The pressure variable may be low or high
    Check the pressure transmission is not a seizure; view the verification equipment and sensor adjustment; check the car damping and electromotive force disturbance.
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