Liquid level control instrumentation system failure analysis method - Database & Sql Blog Articles

Today, I will talk about the fault analysis method of the liquid level control instrument system, which is mainly analyzed from the following points:

(1) When the indication value of the liquid level control instrument system changes to the maximum or minimum, you can check whether the detection instrument is normal. If the indication is normal, change the liquid level control to the manual remote control liquid level to see the liquid level change. If the liquid level can be stabilized within a certain range, the fault is in the liquid level control system; if the liquid level is stable, it is generally the fault caused by the process system, and the cause should be found from the process. (2) When the differential pressure type liquid level control instrument indication and the on-site direct reading type indicating instrument are not in control, first check whether the on-site direct reading type indicating instrument is normal. If the indication is normal, check the negative pressure guiding of the differential pressure type liquid level meter. Whether there is leakage in the pressure tube sealing liquid; if there is leakage, refilling liquid, zero adjustment point; no leakage, it may be that the negative migration amount of the meter is wrong, and the migration amount is readjusted to make the meter indication normal. (3) When the liquid level control instrument system indicates that the value changes frequently, the capacity of the liquid level control object should be analyzed first to analyze the cause of the fault. The large capacity is generally caused by the instrument fault. When the capacity is small, it is necessary to analyze whether the process operation has changed. If there is a change, it is likely that the process causes frequent fluctuations. If there is no change, it may be caused by instrument failure.