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Originally Posted by CarWiz
I think there's a misunderstanding of terms. When one compares Contactors to SSRs, the SSR stands for Solid State Relay. I've never heard of someone comparing an SSR to a PID Controller. The two have nothing to compare. The PID controls when the internal relays or SSRs are under power using the parameters stored. The SSR is simply an electronic relay to turn the heating elements on. It replaces a contactor/relay. Both need power to switch.
To eliminate any confusion on this board, I suggest we maintain that SSR stands for Solid State Relay as most are accustomed.
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My response was based on some one's comment regarding a PID controller.
Tecnicians who deal with accurate temperature controls generally speak of simple "on/off" controllers as those beiing SSR-single switch relay. This refers to the method of control, regardless of whether or not the controller is solid state, tube or otherwise. The PID type controller seeks to flatten out the peaks and valleys caused by SSR type relays. At this end I am referring to types of controllers which would give the end user the best kind of temperature accuracy, which is neither the SSR or the PID, but one that produces a current output such as 40 millivolt or 4-20ma.
Eddie