The first is that the pressure rises and the transmitter cannot convey. In this case, the first thing to do is to check the pressure connection for air leaks or blockages. If not, check the wiring method and power supply. If the power supply is normal, simply pressurize and see if the output changes, or if the sensor part outputs. If there is no change, the sensor is damaged, possibly an instrument or another part of the system.
The second is that the output of the pressure transmitter remains unchanged, and then the output of the pressure transmitter changes suddenly, and the zero position of the pressure transmitter cannot be returned, which is likely to be a problem with the pressure sensor seal. The common reason is due to the size of the seal. After the sensor is tightened, the sealing ring is compressed to the impulse port of the sensor, blocking the sensor. When pressurized, the pressure medium cannot enter, but when the pressure is high, the sealing ring suddenly opens, and the pressure sensor changes under pressure. The best way to eliminate this failure is to remove the sensor and directly check if the part is in good shape. If the part is normal, you can replace the seal and try again.
The third is that the output signal of the transmitter is unstable. This malfunction can be a problem with the stressor. The pressure source itself is an unstable pressure, which is likely to be due to the weak anti-interference ability of the instrument or pressure sensor, the strong vibration of the sensor itself, and the failure of the sensor. It is also possible that the transmitter deviates significantly from the pointer pressure gauge.
The fourth is the effect of the differential pressure transmitter installation position on the zero output. Due to the small measuring range of differential pressure transmitters, the sensing elements in the transmitter can affect the output of differential pressure transmitters. When installing, the pressure-sensitive parts of the transmitter should be perpendicular to the direction of gravity, and the transmitter parts should be adjusted to the standard value after installation and fixation.
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Method 1:
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