Originally Posted by Thirsty_Monk
Unlike Derrin my answer is no. You can not control two different temp sensors with diferent temp at the same time.
All that said Derrin is right that you can flip in between the probes.
You also could connect two probes to the two temp points (like two fermenters). If you let say set Ranco Controller to cool at 68 and one fermenter is at 68 and the other is at 72, Ranco will start cooling regardless of the first probe.
There is LOVE controller that you could have two different probes and control them independently but I do not know the model.
oops!!! I do stand corrected! I didn't read that right the first time and focused on the power issue which he said he'd use an external relay. The Ranco controller will not read two independent sensors at the same time.
You can use a group of 4 to average temps across an area by wiring them in series and parallel but that's a different situation.
Thanks for keeping me straight on this one Monk.
rmwood: In addition to that LOVE controller, you might want to take a look at the BCS-460 from Embedded Control Concepts
. It will handle 4 truly separate processes. It does require external relays.