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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Beer Temp VS Ambient Temp
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Old 03-09-2013, 04:09 AM   #11
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What is your differential set at? Seems like at least 14-16F. I usually set no more than 6F. But your graph clearly demonstrates that even 10F is not a big issue
The differential is 0.3F, probe insulated-over on a carboy. The Carboy temperature variation is <1F and the small temperature cycles haven't created any issues.
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Old 03-09-2013, 07:51 PM   #12
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Looking for a cheap way to graph fermentation temperature.

Will this work or do you have something else to suggest?

Coolerguys Thermal Monitor with Digital LED Display
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Old 03-11-2013, 03:37 AM   #13
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Looking for a cheap way to graph fermentation temperature.

Will this work or do you have something else to suggest?

Coolerguys Thermal Monitor with Digital LED Display
That product doesn't look like it's a data logger, just a temperature display powered through USB.
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Old 03-11-2013, 12:19 PM   #14
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That product doesn't look like it's a data logger, just a temperature display powered through USB.
hmmm . . . that seems pretty useless, but you're right. There's no mention of data being sent to the computer. I liked the idea of the pass through USB thinking that more than one could be used simultaneously. Sent them an email to ask, but here's another low cost one that does have logging and some simple software.




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type slow and don't know what Mr2 is?
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Old 03-12-2013, 09:52 PM   #15
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Has anybody ever tried this while fermenting in water bath? I wonder what the temp difference would be? Being that water is a lot more denser than air. And how long would it take till things even out?
I ferment in water bath, thermowell usually shows 2-3F higher than surrounding water (ambient). Much more stable and predictable that way
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Old 03-13-2013, 12:15 AM   #16
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If the level of the water bath is the same as the beer, the difference is 0-1F, depending on fermentation. They track so closely I quit using my thermowells. I control the water temp instead.

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Old 03-13-2013, 12:32 AM   #17
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I ferment in water bath, thermowell usually shows 2-3F higher than surrounding water (ambient). Much more stable and predictable that way
Are you circulating your water in the bath or just letting it sit stagnant? Makes a big difference.
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Old 03-13-2013, 01:08 AM   #18
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When the fermentation is active, it’s stirred up pretty well. A really active fermentation will be one degree warmer than the water. As it winds down, the difference approaches zero.

If I am cooling the water, there will be stratification during lag phase, but as far as I can tell the temps in and out are the same, up and down.

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Old 03-13-2013, 03:25 AM   #19
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I ferment in water bath, thermowell usually shows 2-3F higher than surrounding water (ambient). Much more stable and predictable that way
Cool thanks for all the info. I usually ferment inside a ice chest temps stay very stable in there. I can even hold lager temps. With ease. 45 degrees is no problem.
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