Using My Two Wire 4 to 20 mA Sensor with a Single Ended Input Module

Updated Dec 13, 2023

Reported In

Hardware

  • C Series Current Input Module

Issue Details

I have a two wire sensor 4-20 mA and I want to read this current with a C Series current input module. Can I do this even though the C Series current input modules are single ended?

Solution

Yes, a 4-20 mA sensor can be place in a current loop that can also have as a part the C Series input module.

The positive terminal of the sensor should be connected to an analog input channel of the C Series module and the negative terminal of the sensor to the COM channel of the module. Any other sensor would use a different analog input channel and the same reference.

Additionally a power source could be required to power the sensor. For more information on 4 to 20 mA current loops refer to Fundamentals, System Design, and Setup for the 4 to 20 mA Current Loop.

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