Hi guys im trying to get Kflop to control the spindle chiller on my Fadal mill. My machine has an ambient temp sensor and a coolant sensor and when there is a 2 degree difference it turns on the chiller.

Should be fairly easy to feed signal to an analog input but I cant find any info about how to power the sensors, and I dont even know enough to make a good guess. The sensors have no markings and they have three wires, a ground, power and signal. Best info i can find is they are fed a "REF" voltage thats comes from 12v through a resistor which could be anything. I dont want to fry the sensors. I tried powering the sensor with an AA battery and I got about 0.7 volts out and this increased when heating sensor slightly which is a good sign.

Anybody here have any knowledge of temperature sensors? Think im safe to power it with 5v or do i need to reduce it down somehow?