Pressure sensor and transmitter common faults - Solutions - Huaqiang Electronic Network

Photocoupler

Pressure sensors and transmitters are prone to the following types of failures: the first is the pressure, the transmitter can not go. In this case, first check whether the pressure port 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 to see if the output changes, or if the sensor zero has output. If there is no change, the sensor is damaged, it may be the damage of the instrument or other parts of the whole system; the second is that the output of the pressurized transmitter does not change, and the output of the pressurized transmitter suddenly changes, the pressure relief transmitter is zero. The position is not going back, it is very likely that the pressure sensor seal is a problem. 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 best 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 and try again. The third is that the transmitter output signal is unstable. This type of failure has the problem of being a source of stress. 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. The fourth type is that the transmitter has a large deviation from the pointer pressure gauge. Deviation is a normal phenomenon, and the normal deviation range can be confirmed; 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.