3 wire PT100

[Froschkönig]

Hello,

I'm using 3 PT100 3-wire sensors and I'm not sure how to connect them.
All the instructions are for 2 or 4 wire sensors.
I use 2 PT100 Duet3D daughter Bords.

https://docs.duet3d.com/Duet3D_hardware/Accessories/PT100_Temperature_Daughterboard
Here it says 2,3 or 4 wire PT100 sensors but all the following instructions are only for 2 or 4 wire.

I hope i dont have to change my sensors....

Greetings
Frosch

[droftarts]

@Froschkönig See https://www.omega.com/en-us/resources/rtd-2-3-4-wire-connections
I think three-wire PT100 simply have two wires already attached on one side of the sensor. I would think it is probably best to add two wires to the other side of the sensor, rather than one, and wire it as a 4-wire sensor. You could also run it as a two-wire sensor, and just leave one of the wires on one side disconnected. Use a multimeter to check which wires are which, if they are not colour coded.

Ian

[Froschkönig]

I connected only 2 of the 3 wires and it seems to work fine. I'm not sure about the accuracy of the sensors, they seem to be a little bit off but thats fine for me.

Topic an be closed! Thx for the help