Having no luck with the search function. I know I've seen discussions on this before; thoughts on best temp probe locations for two temp probes in a 3 Vessel E-Herms? Running two Brew Commanders for control. Thanks!
Having the control thermocouple at the wort return to the tun is OK, but having it even closer to the heat source is better. The greater the distance, the more the PID algorithm is going to have to guess when heat is needed and it makes the system more dependent on having a decent flow rate. Sometimes the mash permeability won't allow a high flow rate. I find that the permeability of a mash is often significantly lower early in the mash and it becomes more permeable as the extract is pulled out of the grist.
I often see a larger difference in wort temperatures between the tun inlet and outlet locations when stepping the mash to another temp, but that's a temporary thing. 1C loss isn't too bad for a tun at steady state.
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