Thermometer reading 4 degrees below temp - Home Brew Forums
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Old 07-01-2010, 03:08 AM   #1
hinke
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Mar 2010
Cedar Park, Texas
Posts: 232
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Hi,

Out of curiosity I tested my thermometer today. I took a test with ice and the thermometer read 28F, I then took a test with boiling water and it read 208F.

Can I assume then that I have mashed at a 4 degree lower temperature than I thought?

Thanks.



 
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Old 07-01-2010, 03:38 AM   #2
Gregscsu
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Apr 2010
St. Paul
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Not really. It is a strating point but I would suggest calibrating this thermometer, and checking it against a proven accurate thermometer. But the best bet is to but a digital thermometer. The dial thermometer I have reads correct at 32 and 212, but is off by 10 degrees in the 140-180 degree range.



 
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Old 07-01-2010, 03:47 AM   #3
hinke
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Mar 2010
Cedar Park, Texas
Posts: 232
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This is a digital one. Can't make adjustments.

I tested a floating thermometer, and it measures to high at 36 with ice.

 
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Old 07-01-2010, 05:31 AM   #4
PT Ray
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Aug 2005
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Quote:
Originally Posted by Gregscsu View Post
The dial thermometer I have reads correct at 32 and 212, but is off by 10 degrees in the 140-180 degree range.
Yep. My digital and analog thermometers read freezing and boiling correctly, they just don't agree with each other on temps in the middle. They're within a degree or two but always found that odd.

 
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Old 07-01-2010, 06:34 AM   #5
samc
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Aug 2008
Portland OR
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Thermo's can drive you nuts. The more you buy the crazier it gets. You can spend on an expensive one and hope that it is correct or you can do what I do which is relax and judge if your beer is coming out the way you want it to. If so you have calibrated with the most important tool - your brain.

btw - I've found that digital ones like CDN or Polder in the $20 dollar range are close enough for my brewing purposes although a Thermopen would be nice to have someday.

 
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Old 07-01-2010, 11:47 AM   #6
hinke
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Mar 2010
Cedar Park, Texas
Posts: 232
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Mine is a CDN. I might save up for a thermopen later, but first on my list is a mill.

My beer does taste good, I do however get a little bit low efficiency. Maybe it's due to lower temp or something.



 
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