YA, I don;t know of Any PID controller that has RTD inputs. But I do know Honewells UDC 5000 has a 4-20mA input. That can be used to set setpoint alarm points etc.
But, that said, Siemens LOGO Mini PLC now has PID capability, and you can add more than one RTD card so with that it may be possible.
Any other full blown PLC it will be capable, but your looking at alot of $$$. The LOGO's are only a couple hundred, and about $100/temp card. I have a couple of them on my 150g, and use them at work alot too. Great little relay box for sure.
What is it your attempting?
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Dan Pesonen
Umm, a tank or 5
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