Does the 3-phase current sensor (PR55-26) absolutely need to be calibrated

Products
1

Hello,

I purchased a few 3-phase current sensors to install at one of my clients’ sites (PR55-26). I’ve read some posts on the forum mentioning a rather complex and difficult-to-understand procedure for calibrating these sensors using the “Channel X Current Calibration Value” field in the Node-Red configuration node.

My question is: is it absolutely necessary to calibrate these sensors before using them, or should this only be done when the measured values are inaccurate?

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3 Channel AC Current Sensor | Motor Current Monitor

Thank you

2

Hi @bertrand.gauvreau sure, let me ask you;

  1. What is the CT current probe range?
  2. What is the AC Current range you will measure (your AC Current machine range)?

Thank you.

3

we ship pre calibrated. if you change the CT then yes you will need to recalibarte.

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4

Hi @Eduardo_Mtz ,
1- CT : 0-600A
2- Current drawn by the motors : 0-205A

Thanks

5

Hi @Bhaskar ,

The sensors came with 0-600A CTs. So, if I understand correctly, the sensors were calibrated for these CTs and don’t need to be recalibrated as long as I use the same CT size?

So in Node-Red, I leave the “Active” checkbox for “Channel 1-2-3 Current Calibration Value” unchecked, right?

Thanks

6

yes keep it unchecked and no need for calibration

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