First, the pressure can go up, the sensor output can not go up
In this case, you should first check whether the pressure interface is leaky or blocked, if it is confirmed that it is not, check whether the wiring method is wrong and check the power supply, if the power supply is normal, it is necessary to perform simple pressure to see whether the output has changed, or see whether the sensor zero has output, if there is no change, the sensor has been damaged. On the contrary, it is the problem of instrument damage or other links of the whole system.
Second, the pressure sensor sealing ring problem
When the sensor output is pressurized for the first time, there is no change in the sensor output, and when the sensor output is pressurized again, the sensor zero position cannot be returned after pressure relief, which is likely to be the problem of the pressure sensor seal ring. The common situation is that due to the sealing ring specification, after the sensor is tightened, the sealing ring is compressed into the sensor suction port, thus blocking the sensor. When pressurized, the pressure medium can not go in, but when the pressure is large, the sealing ring is suddenly opened, and the pressure sensor is changed by pressure. The best way to eliminate this fault is to remove the sensor, directly see whether the zero position is normal, if the zero position is normal, replace the seal ring and try again.
Third, the output signal of the sensor is unstable
This failure can certainly be attributed to a stressor. The pressure source itself is an unstable pressure, and it is likely that the anti-interference ability of the instrument or pressure sensor is not strong, the vibration of the sensor itself is very strong, or the sensor has been damaged.
Four, the sensor and pointer pressure gauge control deviation is large
The occurrence of such deviation is a normal phenomenon, and the normal deviation range can be confirmed; A final type of failure is the effect of the mounting position of the differential pressure sensor on the zero output. Because of its small measuring range, the sensor elements in the sensor will affect the output of the microdifferential pressure sensor. When installing, the pressure sensitive part of the sensor should be axial 90 degrees perpendicular to the direction of gravity, and remember to adjust the zero position of the sensor to the standard value after installation.
