KennyM I'm currently planning/building my own 3V HERMS system and I'm getting a bit confused with the best locations for my temp probes. Reading different opinions every where!!!
Where do you have yours mounted and are you happy with?
Would you change anything now that you have been running the system for some time now?
Cheers mate
bradleybiscuits,
My setup is pretty much as described at the
www.theelectricbrewery.com website. I have the HLT probe in the piping leaving the HLT. I recirculate the HLT water back into the HLT and this keeps the water temperature exactly where I have it set on the PID controller.
I have the mash probe also in the piping leaving the mash tun. I recirculate through the HLT HERMS coil back into the mash tun during the mash cycle. I have no trouble keeping the wort temperature exactly as set. I know some people like having the mash probe on the exit of the HERMS coil. I have my system setup to control the HLT heating element from either the HLT temp probe or the mash temp probe. Not really necessary but it gives me control options and I can have different PID tuning values setup between the two controllers.
Typically in process control engineering, you want to monitor your process variable at the exit point of what you are trying to maintain whether it's temperature, pressure, level, etc.
The boil temperature probe is located in the side of the boil kettle close to the bottom.
I also have a temperature probe at the exit of the CFC chiller that displays on its own controller. Again not really necessary but it gives me a backup PID controller in the panel if I ever need it. I also could control the wort flow through the CFC someday for temperature controlled cooling if I every decide to by adding a variable electric valve to the CFC chiller wort inlet.
Overall I am happy with how the system turned out and I wouldn't change anything if doing it again.
Good luck with your build,
KennyM