Anyone use RTD instead of a Thermocouple?

[Banditperformance]

I have noticed alot of people using TC's for there oven measuring equipment. I hope all of you are wireing them properly. By that I mean using TC wire ALL the way back to the controller in 1 piece with no splices. Yes, there is special Thermocouple wire. I have run miles of it in my line of work. It's a stiff wire jacketd by usually Teflon. TC's are good, but they acctually measude a difference between the hot end, and the cold end. So, if the heat in your shop fluctuates alot, your oven temp can be off. IE, if you bake one day and it's 85* in the shop. Next month, you bake and the shop temp is 65*, you oven just might be 20* off.

Now RTD's, they are a device that doesn't produce a voltage difference like a TC, they change resistance with temperature. Resistive Temperature Device. You wire them up with ordinary wire, and there are 2 and 3 wire typed. The 3 wire is better, because it uses 2 wires for a "absolute" measurement. It will compare the resistance between both wires to get a more accurate reading. When witing RTD's, you do have to make sure your wires are the same leingth though, give ot take an inch, because the system measures the total resistance of the wires in the circut.

Most PID controllers that we all are using are selectable for either TC or RTD as well. I use the Watlow series 93 controller myself. Have 2 going into my oven for staged heat.

Just a little info incase soomeone was wondering the difference.