please can anyone tell me in detail, what's mean by open
loop and close loop?

Answer Posted / senthil.doosan

example for open loop - u can only monitor the output of
the transmitter(pressure,flow,temp.level)
example for closed loop-u can monitor the output of the
transmitter (pressure,flow,temp.level) and u can control
the process by using these parameters feedback by final
control element.

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