Re: oven parts help needed
The PID's sold on ebay and other sources are not very complicated in most senses. They just work to control a temperature set point with the added ability to set off alarms at high and low temp(if desired). The thermo coupler mounts inside the oven and reports back to the pid the actual oven temperature. The pid then works to maintain the set point temperature from this feedback.
In addition to a pid you will need an SSR(solid state relay) to drive the elements. The pid circuitry is not robust enough to handle the load of the elements so that is where the SSR comes in. During heat-up times, the pid sends a DC voltage signal to the SSR(s) which then closes the 'load' contacts, providing power to the element(s). Once the temperature set point is reached the pid cycles the SSR on and off to maintain the set point.
Read some of the prior posts on this site as they contain much information about what is needed to complete your oven. There are several wiring diagrams posted which should give you a good idea about the overall setup.
The other things you might consider are:
A master disconnect for the 240VAC
An on/off switch for the PID
A light for inside the oven
A fan or blower to recirculate heat.
High temp wire going into the elements
Heat sink for the SSR
An appropriately sized circuit for the oven.
I can also send you my oven wiring diagram if you send me your email address.
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