pt 100

Thread Starter

alan carr

Joined Oct 1, 2008
i hav a pt 100 4 wire probe. its got no information wit it at all just two white and two red wires i know tihs prob sounds stupid to u guys but is there any way i can find out which is V+ V- and the rest plz help first timer not sure what i got myself into


Joined Dec 27, 2007
PT100 is a common temperature transducer. It comes available in a variety of interface options, so you need to give the part number. Could be 4-20mA, 0-5V, etc.



Joined Apr 20, 2004
If it's just a bare probe, the leads may be for Kelvin measurement. Two wires carry the current, and the other pair are for the measurement device. The way to check is to place an ohmmeter on the leads. If I am correct, the reds should read shorted, same for white. The resistive element is not polarity sensitive.