Heat treat furnace

[Highpower]

   

Got the new thermocouple installed and proceeded to set the parameters on the PID controller. It had me befuddled for awhile because it would bring up two different parameters at the same time - one on each digital display, and I didn't know which one I was setting!  

I fiddled with it for some time and finally figured out the upper display was for the setting currently being adjusted, and the lower display was just showing the next parameter that was going to come up afterward. Once I knew that it was smooth sailing.  

Running the "autotune" routine and the furnace is warming up.

   

Reached the temperature set point (1500° F), and autotune is still running. (Fine tuning the response.)

   

Autotune completed and switching back to normal operation. Temperature dropped 1 degree while doing that, but the output to the heating element came back on and quickly recovered.

   

And yes, believe it or not the furnace actually still works!