Fault category:
Hardware failure
Operating conditions:
The liquid level display suddenly fluctuates several times, and the display returns to normal after zero correction.
Fault symptom description:
During the process control and monitoring panel, it was found that the liquid level display of the remote liquid level gauge in the fractionation zone suddenly pulsated (the liquid level fluctuated several times before, and the liquid level display returned to normal after the air calibration zero). After receiving the process notice, the instrument was disassembled and checked on site.
Fault causes and judgment ideas:
1.The liquid medium in the buoy contains impurities
2. The buoy body is damaged
3. The transmitter sensor is faulty
Effective troubleshooting methods and preventive measures:
1. Contact the process to close the positive and negative pressure valve of the liquid level gauge, open the guide to discharge the medium in the buoy, and observe whether the medium contains foreign matter or whether the medium is cloudy.
2. Disassemble the buoy to check whether there is any foreign object attached to the buoy or whether there is any damage to the buoy body.
3. Check whether the cable to the liquid level gauge is faulty, such as virtual connection.
4. After checking step by step according to the above steps, no abnormal situation is found, and it is judged that the float liquid level gauge sensor is faulty. Replace the sensor and set relevant parameters. After the liquid level gauge is put into use, the liquid level indicator returns to normal.
The End
