MLT calibration - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > MLT calibration

Thread Tools
Old 11-09-2009, 05:59 AM   #1
Apr 2009
Posts: 161
Liked 1 Times on 1 Posts

I have a standard 10 gal Rubbermaid cooler I use for a MLT.

I would like to know how you would go about calibrating a MLT for a more precise mashing temps or should I say striking temps when using software like beersmith, promash or BeerTools Pro.

What do you do to calibrate yours?

Reply With Quote
Old 11-09-2009, 06:38 AM   #2
Oct 2006
Seattle. WA
Posts: 197
Liked 1 Times on 1 Posts

I think it mostly depends on your process and a little bit of trial and error. On my system, I preheat the cooler with hot tap water (fill it with a few gallons and shake around while mash water heats up) and pour it out just before I mash. By doing this, I can use the formulas from Palmer ( to calculate the temp of the mash water. I'm usually shooting 14-15 degrees hotter than the mash temp.

I found that if I did not heat my mashtun before there were more swings and it was not so predictable. Another trick while you're dialing your system in is to try to miss high. To me, it is easier to cool things down (just add a little cold water and stir) than to heat up, especially once you get the grain in there.

Keep track of how you end up each time and compare -- you can get it dialed in in a few tries.

Hope this helps.

Reply With Quote
Old 10-13-2010, 12:59 PM   #3
Jul 2009
Commerce, GA
Posts: 561
Liked 17 Times on 12 Posts

I don't use the temp calibration for equipment on BeerSmith. Instead, I heat to 5F-7F over what it says the uncalibrated strike temp should be, pour it in the MTL, and seal it up. After 5-10 minutes, I check the temp and stir until it is down to the strike temp listed in BeerSmith before stirring in the grains. I hit my mash temps on the nose most times with this method.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hydrometer Calibration Jetsona Beginners Beer Brewing Forum 11 08-22-2009 02:43 PM
refractometer calibration polecreek Equipment/Sanitation 2 02-24-2009 03:15 AM
thermometer calibration killian General Techniques 28 08-14-2008 08:52 PM
Cooler MLT calibration slim chillingsworth Equipment/Sanitation 3 04-09-2008 08:45 PM
calibration for priming Jack General Techniques 2 12-10-2006 09:03 AM

Forum Jump