Four major failure analysis of pressure sensors

1. The problem of the pressure sensor seal ring The output of the pressure transmitter does not change, and the output of the pressure transmitter suddenly changes suddenly. The pressure transmitter transmitter will not return to the zero position. It is likely to be a problem of the pressure sensor seal ring. It is common that due to the sealing ring specification, after the sensor is tightened, the sealing ring is compressed into the sensor pressure guiding port to block the sensor. When the pressure is pressurized, the pressure medium cannot enter, but when the pressure is large, the sealing ring is suddenly opened, and the pressure sensor is under pressure. Variety. The way to eliminate this kind of fault is to remove the sensor and directly check whether the zero position is normal. If the zero position is normal, replace the seal ring and try again;
2. The deviation between the transmitter and the pointer pressure gauge is normal. It is normal to confirm the normal deviation range. The last easy fault is the influence of the installation position of the differential pressure transmitter on the zero output. . Due to the small measurement range of the differential pressure transmitter, the sensing elements in the transmitter affect the output of the differential pressure transmitter. The pressure sensitive component of the transmitter should be axially perpendicular to the direction of gravity during installation. After installation and fixing, adjust the transmitter zero to the standard value.
3, the pressure goes up, the transmitter output does not go this kind of situation, first check whether the pressure interface is leaking or blocked, if it is not confirmed, check the wiring method and check the power supply, if the power supply is normal, simply pressurize the output Whether it changes, or whether there is output from the sensor zero. If there is no change, the sensor is damaged, which may be the damage of the instrument or other parts of the whole system;
4, the transmitter output signal is unstable This fault is a problem of pressure source. The pressure source itself is an unstable pressure. It is very likely that the instrument or pressure sensor is not strong in anti-interference ability, the sensor itself is very vibrating and the sensor is faulty.

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