Instrumentation

Loop check

Definition

A test that proves a signal path works end to end, from the field device through the wiring and input card to the value the operator sees.

Injecting known currents tests everything downstream of the transmitter. Measuring the transmitter output tests everything upstream. Doing both separately tells you which half owns a problem.

How to Test a 4-20 mA LoopProve a current loop end to end with a meter and a calibrator, without interrupting a process you were not authorized to interrupt.

Loop check

Definition

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