An issue on Rosemount dp type level transmitters installed on steam drain pots but all tx have deviation once pump started to drain the level while they are going down, we face the deviation issue in all txs , we already tried to adjust and calibrate but not succeed to resolve this issue

 

I am not familiar with sensing the DP across a drain pot. Is the DP the level in the drain pot?

Can you show a sketch of a typical drain pot, where and who the DP cell and its impulse tubes are located and connected ?

Does the pump directly drain a drain pot, by design or by accident?

Can you provide some numbers as to what you expect the DP to read under a set of circumstance: before pump runs, pumps starts, pump runs) and what the ±deviation that you see under those circumstances?