Pressure switch 7861-93-1880 for excavator parts pressure sensor

Common faults

Pressure sensor failures are mainly as follows:

The first is that the pressure goes up, but the transmitter can't go up. In this case, first check whether the pressure interface leaks or is blocked. If it is not, check the wiring mode and the power supply. If the power supply is normal, simply pressurize it to see if the output changes, or check whether the zero position of the sensor has output. If there is no change, the sensor is damaged, which may be a problem of instrument damage or other links of the whole system.

The second is that the output of the pressurization transmitter does not change, and then the output of the pressurization transmitter suddenly changes, so that the zero position of the pressure relief transmitter cannot be returned, which is probably the problem of the pressure sensor sealing ring. It is common that due to the specifications of the sealing ring, after the sensor is tightened, the sealing ring is compressed into the pressure inlet of the sensor to block the sensor, and the pressure medium can't get in when it is pressurized, but when the pressure is high, the sealing ring suddenly bursts open, and the pressure sensor changes under pressure. The best way to eliminate this fault is to remove the sensor and directly check whether the zero position is normal. If the zero position is normal, replace the sealing ring and try again.

The third is that the output signal of the transmitter is unstable. This kind of fault may be the problem of pressure source. The pressure source itself is an unstable pressure, which is probably due to the weak anti-interference ability of the instrument or pressure sensor, the strong vibration of the sensor itself and the sensor failure; The fourth is that the contrast deviation between transmitter and pointer pressure gauge is large. Deviation is normal, just confirm the normal deviation range;

The last common fault is the influence of the installation position of micro differential pressure transmitter on the zero output. Because of its small measuring range, the sensing elements in the micro differential pressure transmitter will affect the output of the micro differential pressure transmitter. During installation, the pressure sensitive part of the transmitter should be axially perpendicular to the direction of gravity, and the zero position of the transmitter should be adjusted to the standard value after installation and fixation.