What about using a selector switch to switch the SSR outputs from the pid's. You could switch the negative side of the signal from the PID to control the element from different PID's that way. A 3PST switch should do that just fine. And the amperage draw to the SSR's through the switch will be nominal. Just an idea to control the output side of the PID rather than selecting a whole PID to be in control of your process. I hope I 'splained that well enough to understand, I suck at tech explanations. Otherwise that a great looking panel design too.
What do you mean "no Kidneys"???, WTF now I gotta drink less beer...
Join the Automation sub forum in Electric brewing for a discussion of components and control systems. I did!!!!