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Inst Tools > Blog > Control Systems > Loop Calibrator to Simulate a 4-20 mA Signal

Loop Calibrator to Simulate a 4-20 mA Signal

Last updated: February 21, 2020 10:22 am
Editorial Staff
Control Systems
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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:

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Loop Calibrator to Simulate a 4-20 mA SignalRead Next:

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.

Share your answers with us through comments.

Read Next:

  • How to use Loop Calibrator
  • 4–20 mA Control Loops
  • As-Found and As-Left
  • Loop Powered Instruments
  • Loop Checks Transmitters

Credits: Tony R. Kuphaldt

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2 Comments
  • saurav kumar gupta says:
    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 says:
    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.

    Reply

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