1. Glass Level Gauge in the Mother Liquid Tank Shows Changes, but Remote Level Display Does Not Change for an Extended Period
Fault Diagnosis: It is suspected that the sampling pipe might be clogged. On-site inspection reveals that the liquid-phase pipe is blocked.
Fault Resolution: Close the sampling valve and clear the blockage in the sampling pipe. After clearing, the instrument display returns to normal.
Maintenance Summary: When the liquid-phase sampling pipe is blocked, the liquid from the mother liquid tank cannot flow into the outer float, causing the float level to remain unchanged, which in turn results in no change in the transmitter output signal.
2. Level Does Not Change in a Condensation Tower
Fault Diagnosis: Check power supply and transmitter functionality, both are normal. After performing drainage, a slight change in the display is observed. Disassembly reveals that the float was stuck.
Fault Resolution: During the shutdown maintenance, the level gauge was reinstalled, and the fault did not reoccur within the next year.
Maintenance Summary: This fault had occurred multiple times previously. Initially, the vertical alignment of the float body was found to be unqualified, but it was not reworked, which left hidden issues. The reinstallation resolved the problem.
3. LT-106 Level Display in Gasoline Separator Tank Stays at 25% with No Change
Fault Diagnosis: It is suspected that excessive sludge has accumulated at the bottom of the tank. After cleaning, the equipment is put back into operation, but the fault reappears after a week. After another cleaning, the level still remains at 25%. Calibration with water shows no change, but using a wire to unblock the float results in a change in the display.
Fault Resolution: The float was repeatedly rinsed with water, followed by recalibration. After this, the instrument returned to normal operation.
Maintenance Summary: The float meter showed no change at 25% due to the float sticking to the wall of the tank, caused by internal contamination. This example highlights that regular draining is an essential condition for ensuring the proper operation of float level meters.