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Old 07-19-2007, 09:35 PM   #1
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Default How hot does fermentation get?!!!

I brewed a blueberry ale yesterday, and pitched a packet of Safale S-05 last night. I decided to put a submersible thermometer in there to see how hot it actually is in the middle of the storm, and this is what I saw when I got home today:



139 degrees!!! Holy crap! It's in a bucket of cold water too, but does it really get that hot in there from all the yeasties moving around?



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Old 07-19-2007, 09:41 PM   #2
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I would have to say something is wrong with your thermometer. Fermentation temps can get a little over 5 degrees higher, at 139 your yeast would be dead...



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Old 07-19-2007, 09:52 PM   #3
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Quote:
Originally Posted by Monster Mash
I would have to say something is wrong with your thermometer. Fermentation temps can get a little over 5 degrees higher, at 139 your yeast would be dead...
x2, although I have had some get 10* hotter
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Old 07-19-2007, 09:55 PM   #4
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I'm wondering if it's not that hot in there, but it's moving around so fast that it's fooling the thermometer. Otherwise I've been mashing at just above freezing.

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Old 07-19-2007, 09:56 PM   #5
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LOL
139?
150 - 160 degrees F is the temperature at which you can get a second degree burn.

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Old 07-20-2007, 12:25 AM   #6
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I don't think your thermometer is meant to be submerged where the probe hits the wire lead.

I did that with mine, and it read 189F after a few minutes, even ice cold water only dropped it 2 degrees.

I let it dry out for about 5 days, and it works again.

it's a digital oven thermometer, so I gotta be careful about letting it fall all the way into the brewpot.

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Old 07-20-2007, 12:57 AM   #7
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What you have there is what I like to call a "mulled" fermentation.

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Old 07-20-2007, 05:37 AM   #8
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Damn Fisher Scientific, last time I buy anything from them on lab money...



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