0-5VDC Current Transducer

We use the following current transducer from NK Technologies at work for monitoring equipment.


It has a 0-5vdc output. Is it possible to use this for the emon? I have not been able to find anything about using this type of CT with the emon. I have been able to a reading when using it with the standard setup that is listed on this site but the reading is way off. I am assuming that this is because it is designed for use with a CT that provides an AC output.

What would I have to do to make this CT work?


Sergegsx's picture

Re: 0-5VDC Current Transducer

the label says it has a 4-20mA output.

Robert Wall's picture

Re: 0-5VDC Current Transducer

The device you cite is a full-blown transducer, not just a current transformer. You could use it, but you would be restricted to measuring current and apparent power. Measurement of real power, power factor and the direction of energy transfer - important if you have your own source of generation - will not be available to you.

If those restrictions are acceptable, then you connect the input to the analogue input of the processor directly for the Arduino or via a simple voltage divider if you're using the emonTx. You won't be able to use the standard emonLib library, but it won't be difficult to integrate the current the device measures into your sketch, you would simply call the output from the transducer "current" and scale it appropriately.

[Edit: Sergegsx: Many such instruments have both 4-20 mA and 0-5 V outputs, so this is probably not a concern.]

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.