Powder coating oven build

[JayP]

I have been researching oven builds for a while now and have started my build. My oven interior dimensions are 30" w x 32" d x 60" h. I'm not using the normal metal studs for the structure. I'm using 3/16 angle iron for the main frame and 16 ga for panel supports. The reason is to reduce heat transfer from the interior to the exterior. The interior panels are 16 ga and the exterior will be 20 ga. I have 2" mineral wool for the insulation.
I am using 4 1500 watt elements with a circulating fan ducted from the top to inside on the back wall to the bottom where the elements are going to be located.
I have built the control panel and started on the base. I have all the interior panels cut to size.
My big question is the temperature sensor. I purchased a clamp on sensor for testing when I get it built but was wondering if there is a preferred sensor and installation method. I have the pid controller for contactors from auberins.
Thanks for any input.
Please share any concerns you may see in my plans.
Jay

[ed_denu]

Most ovens are using a K type thermocouple for temperature feedback to the pid. If you want to use both, a K and a clamp-on then install an inline switch that allows you to alternate between either. That's what I did on mine and it didn't affect temperature readings. You might also include a small opening in the door to allow use of a IR gun to monitor part temperatures.

[JayP]

Thanks. I'll look into that style thermocouple. I forgot to mention that I will be installing a glass door in the door. I have an IR gun. I am planning on hanging some 1/4" squares at various locations and heights and take temperature readings to check for hot or cold spots and make changes as needed.
Jay

[JayP]

This is the control panel I have built. I used 2 30 amp disconnect enclosures. The right side has the 2 - 240 volt contactors controlled by the pid and the left side has a 120 volt coil controlled by a switch or timer to control the 240 volt power to the pid.The controls will be mounted on top of the oven with a spacer to avoid any heat transfer.

Thanks for looking,
Jay