Given the typical heat-treating production-floor temperatures, electronic power supplies, PLC/PID controllers and data-collection instruments will be subjected to extreme environmental temperature stresses. This is not to say the instrumentation equipment is not up to the challenge; they have been designed to operate in that environment. But all of the equipment’s internal components have a finite usable life span.
An increase in operating temperature will cause resistors’ resistance values to shift, semiconductors (transistor and integrated circuits) to overheat and capacitors’ internal temperature to increase, leading to failures over time. The electrolytic capacitor’s internal temperature can be used to monitor its health and give us an overall reading of the instrumentation equipment condition. That leads us to the topic of capacitor wear-out during its usable life and after reaching the end of endurance time.