Originally Posted by Bigscience
You're monitoring the HLT (Hot Liquor Tank... or all your hot water), the HEX (Heat Exchanger... maybe the wort temperature into your HERMS coil?), the HERM (wort temperature out of the coil? I'm guessing here), and the MLT (the temperature of your wort in the mash tun).
In other words, you're dedicating 4 PIDs (or just temp readouts) and temperature probes to measuring what I can only guess are 4 temperatures that are going to be within 2-3* of each other...
Do you have a separate post where you detail the thought process behind this setup? I'd be curious to see what it is...