4-20 mA loop test

Q&A System Integration

How do I do the loop test? I'm working in a plant startup, and I need to do the loop test on all our 4-20 mA field devices.

Expert’s answer: 4-20 mA loop test

To do a 4-20 mA loop test, we recommend that you simulate the output through the field device. Most HART field devices allow you to simulate the output as well as the process measurement.

Courtesy of Endress+Hauser

Usually, you do loop tests when you go out in the field to check on your device configurations. However, if you have a device that can’t do its own loop test, you should use a loop calibrator. You’ll find plenty of options for those on the market.

The loop calibrator will help you simulate the 4-20 mA output and check the loop. It may also test a valve or a similar final element as well.

For more information, check the links below:

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