The PID controller is an Omega CN132 that came with a instruction manual. In the manual there was a circuit diagram for operating the controller with a mechanical or solid state relay. I tested the system with a mechanical relay and eventually bought a cheap 24-480V AC, 25A solid state relay for use in the system. I am using a type K (−200 °C to +1350 °C range) thermocouple as the sensor input.
|Circuit diagram for controller use with solid state relay|