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I have a 3 wire RTD sensor (Pt100). The leads coming off of it are not long enough to reach our temperature controller. I bought some RTD extension cable (3 wire) from the same company.

Is it okay to use solder to connect the 3 wire RTD extension cable to the 3 leads on the RTD sensor? Or is this poor practice and would it meaningfully affect the temperature measurement accuracy? The other option would be to make sure I place 3 pin RTD connectors on either side of the cables instead of just soldering.

For our purposes we only need +-1 C in accuracy (and the RTD's are Class A) so I highly doubt this would make a difference, but thought I would ask and confirm.

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There's no problem with soldering to splice the wires. Just avoid adding mismatched length (a few cm won't matter) and match up the colors so the lead resistances are reasonably well matched.

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I don't think it would be a problem, at least not in the way it would with thermocouple. A quick test would be to take a measurement before and after to see if the effects are suitable for your application.

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