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why we use by pas on a positioner? When can a by pass be
not used on a positioner ?
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Answer Posted / fariba
By-pass option allows positioner to be removed without
disturbing the control valve operation.
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A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?
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