Originally Posted by jmp138
PID and SSR? Sorry I am an electrical retard. Can you just weld the element in?
A PID is a Proportional, Integral, derivative controller that has a temperature sensor that it uses for feedback to tell the controller what to do with the SSR. An SSR is a Solid State Relay that actually connects and/or breaks power to your heating element.
In essence, the PID will look at the temperature sensor and compare the actual temperature to the set point that you have entered and if the actual temp is below the set point temp then it will turn on the SSR 100% of the time, thus supplying full power to your heating element, until it approaches the set point then it will begin to cycle the SSR to maintain that set point.
This is not precisely how all PID loops occur but it does give a very watered down explanation.
Not trying to sound condescending. Just trying to give a general explanation.
Hope it helps.