Heat treat furnace

[TomG]

(12-05-2015, 01:42 AM)Highpower Wrote: So I guess now I just have to decide on which length thermocouple I need from McMaster. 12, 18, or 24 inch. If I get one long enough to reach the PID terminal block, I shouldn't need additional thermocouple wire - should I?  

Willie,

The MC thermocouples are of similar design except they use a bunch of the ceramic spacers along the full length of the wires. You would only need to use enough of them to reach through the wall of the furnace. And no, if you can place the PID close enough to connect it directly to the thermocouple wires, you would not need any extension wire. That's a good thing because any connections act as additional junctions that affect the reading. The type of wire needs to match the different types of thermocouples, to reduce that effect.

Tom