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Tank Control

Hi,

I have a problem with the control. I have set the control of the tank as below

IF BEARD RES. Level = 5.00 m THEN P-6561 Pipe Status = Closed
IF BEARD RES. Level < 4.00 m THEN P-6561 Pipe Status = Open

However the tank level does not stop at 5m. Does anyone know what is the problem was?