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Connecting 3-wire PT100 on IO-PT400

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Hi, the existing installation consists of eight PT100 sensors connected to a Digital indicator with 3 wire runs for each sensor. I intend to replace the Digital indicator and use IO-PT400 and V130.

However, the IO-PT400 manual appears to suggest only 4-wire RTD connections.  

So my question is whether I can use the IO-PT400 with 3-wire RTD only.  If so, should I jumper +I and +V terminals or should I jumper -I and -V terminals on IO-PT400 end?


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  • MVP 2023

Yes, you can use this module with 100 ohm RTDs.  The manual did show a three wire device but they ran four wires to the RTD and made the jumper connection there.  You could certainly put the jumper at the module with a small loss of precision.

Whether you want to run three or four conductors depends on what kind of accuracy you want.


Joe T.

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