Home Brew Forums > Home Brewing Beer > General Techniques > fermentation temp
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Old 10-26-2012, 12:31 AM   #11
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Thanks actually last time I did a check my ambient was 45 and I had the probe in a jar of water setpoint 38 for a keg of course. And the jar water was like 36 Why such a big difference? Again thanks for the input on this. I have a starting point now just need to decide where to put the probe. Water jar, in the air or foam method. Do u think for fermentation it is OK to assume all is well using the ambient temp method? Thanks again not trying to over complicate just want to get it right with investment I have made.
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Old 10-26-2012, 01:30 AM   #12
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Most probes state they shouldn't be submersed. I know people do it, but it may not be a good long-term solution, hence taping it to the outside of the bucket.
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Old 10-26-2012, 01:33 AM   #13
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Cool thanks for all of your help.
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Old 10-26-2012, 01:51 AM   #14
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I drilled a hole in the top of a whitelabs yeast vial, filled with water and stuck my probe in there. Obviously wont' give you the temp of the fermenting wort but it accurately measures the temperature of liquid in the keezer.
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Old 10-26-2012, 01:57 AM   #15
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Great idea! Anyone happen to know if the a419 probe is OK in water as long as it is only in about half way?
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Old 10-26-2012, 03:37 AM   #16
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I have a growler filled with star san that my probe goes into. It's been there for a year and works for me.
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Old 10-26-2012, 04:24 AM   #17
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Great thx
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Old 11-14-2012, 04:42 AM   #18
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Quote:
Originally Posted by moviebrain
Take a chunk of styrofoam and sandwich the temp probe between the carboy/bucket and the foam, taping it down. Change the offset value from 6 degrees to 2 degrees and you will help smooth out the fermentation temp jumps.

It's not as good as a thermowell but better than measuring ambient.

Just remember that if you finish and go back to ambient to increase the offset to 6 degrees again.
Can u explain why going back to the 6 differential. I get the 2 different on zeroing it in on fermentation. but why have 6 degrees for ambient? Just a little confused.
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Old 11-15-2012, 06:36 AM   #19
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It's all about thermal mass. If the probe is swinging freely inside your chamber it'll warm up inside quicker than if it is making contact with a keg, carboy, or other liquid.

If you left it on a 2 degree differential and swinging free the compressor will kick on and off much more often than you want.

At a 6 degree differential, the serving kegs and bottles in your fridge should even out at whatever temp you've chosen, or a degree or two colder. I have my fridge set to 38, so at 38 it'll kick on and drop to 32/33, and slowly warm back up *ambient*, but the liquids stay much closer to 36-38F.
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