My tin furnace temperature probe is broken. I don't know the model. Thermostat says: thermocouple K E；; ; What is the meaning of' cu50' after thermal resistance Pt 100 Cu50?

First, you have to find out what your temperature range is. That is to say, your thermostat can be used with thermocouples K and E, and also with thermal resistors PT 100 and CU50. My phenomenon tells you the temperature measuring range of these thermocouples and thermal resistors: k (0-1300℃); e(0-800°C)； CU50(-50- 150°C)； PT 100(-200-600℃)