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Loop Calibrator to Simulate a 4-20 mA Signal

Suppose a technician wishes to use a loop calibrator to simulate a 4-20 mA signal to a controller, and decides to connect the loop calibrator to the circuit like this:

Loop Calibrator to Simulate a 4-20 mA Signal

Loop Calibrator to Simulate a 4-20 mA Signal

Explain why this is an improper use of the loop calibrator, and what will happen if the technician tries to simulate a 9 mA signal this way. Finally, identify the proper way to use the loop calibrator to simulate a transmitter signal.

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Credits: Tony R. Kuphaldt

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2 comments

saurav kumar gupta February 13, 2020 at 10:36 am

The calibrator is not even in closed loop and it is connected as a parallel dc source which will add more mili amps to the instrument additional to the controller mamps supply. Thus the operation of the instrument will be not as expected.

Reply
Vignesh March 23, 2020 at 1:29 pm

Once we have simulate the mA values to the DCS with probes directly to the 24v dc cores without the connection in the tx.

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Loop Calibrator to Simulate a 4-20 mA Signal

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