Herms advice.

[hooper80]

I have a 3 v 50lt herms brewery. I have a Emersion chiller in my hlt to recirc my wort. I also have a Thermowell in it and I control the temp in my mash tun using a temp control unit all from my hlt. There is a few degress difference between the two vessels and I always have to over compensate accordingly.
My question is..... Can I put another thermo well into my mash tun and then stick the temp control probe into the mash tun while it controls the element in my hlt? (So it's reading mash tun temp but heating my hlt), make sense?

A bit confusing.

 

[mofox1]

You certainly can, but it's a heck of a slow response from a control systems point of view. About the only worse place to put the probe would be the outlet of the tun / inlet of coil.

Better to whack that temp probe in the outlet of the coil (best), or where it returns back to the mash tun (okay... but insulate your tubing well).

 

[The Judge]

To follow on from what mofox has said, the reason for taking your temp measurement at the outlet of the coil is that it is the most representative temperature of your hot recirculating wort and a change in temp here can be compensated easily by your control system by changing the temp of your hot liquor (very little lag).

Your grain bed, unless constantly stirred and in a superbly insulated MLT, will have some kind of small temperature profile across it, so use the temp reading from the outlet of your coil as your reference mash temp. That way you have a consistent way of measuring and recording mash temps.

 

[hooper80]

To follow on from what mofox has said, the reason for taking your temp measurement at the outlet of the coil is that it is the most representative temperature of your hot recirculating wort and a change in temp here can be compensated easily by your control system by changing the temp of your hot liquor (very little lag).

Your grain bed, unless constantly stirred and in a superbly insulated MLT, will have some kind of small temperature profile across it, so use the temp reading from the outlet of your coil as your reference mash temp. That way you have a consistent way of measuring and recording mash temps.

Ok thanks blokes. Great info, So how would u recommend I set the temp control probe up on the end of my 1/2 copper pipe Emersion chiller?

 

[The Judge]

Simple way would be a 1/2" tee piece in the line heading back to the MLT.

 

[mxd]

Simple way would be a 1/2" tee piece in the line heading back to the MLT.

yep.

you can see mine in the following picy
https://www.dropbox.com/s/frib3o892yoh03y/IMAGE_203.jpeg?dl=0