Questions about differential pressure level gauges. Experts, please help.
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Before the maintenance, the differential pressure I was using was normal, showing negative values. But once we shut down the DCS system and started it up again, the value became abnormal, showing positive values. The sealed container in question was opened at some point – what could be the cause of this?
If the intermediate sealed container has been opened, it is necessary to redo the instrument calibration and perform a zero-point adjustment again.
It’s also possible that the positive and negative pressure chambers are reversed.
Did the liquid in the isolation tank leak out? Check it.
I wonder if it’s a capillary or a pressure tube? It may be necessary to migrate the table again!
1. Check the assembly of the intermediate sealed container. 2. Calibrate the instruments