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Originally Posted by eclipsespeed
The biggest thing ive seen people say to make sure is correct when choosing a PIC is that the amp and ma output is high enough to drive the SSR/SSR's
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Yes, you need to make sure that the controller is compatible and capable of driving the SSR/contactor you chose. That is the major consideration. Other than that it depends a lot on how simple or complex you want the controls. Either of these manufactures PID's would work fine in an oven environment.
I'm not sure why a controller used to maintain oven temperatures would need to generate a pulse voltage
As PID's use a relay of some type to control element power I would assume all of these would supply linear(fixed) voltage on their output terminals. As for DC voltage, SSR's can have either AC or DC input voltage requirements so again you need to match the SSR to the PID. Most of the newer PID's however are capable of supplying either DC or AC output power to drive a relay.