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Old 06-17-2013, 07:45 PM   #1
BMClark2210
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Default Temperature contol probe

Ok I finally got a chest freezer and temperature control. Now do I drop the probe directly into the freezer or put in into a glass of water like I have seen some of the guys on BrewTV do to maintain the temp of the liquid and not the air. Thanks pretty excited to get started ok lagers!!!

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Old 06-17-2013, 08:12 PM   #2
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Do not put the probe directly into water, you don't know if it is water proof and it could ruin it.

I just let mine hang so I get the temperature of the air in the freezer.

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Old 06-17-2013, 08:16 PM   #3
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I also advise against putting the probe in water unless your certain it's waterproof.

What I do is tape my probe to the outside of the fermenting vessel. Air heats and cools more rapidly than liquid, and thus more rapidly that your fermenter. Not only will this keep your unit from cycling on and off as much, it's the temperature of the wort you want to control.

Adding a bit of insulation atop the probe after it's been affixed to the side of the fermenter also helps. Bubble wrap or an old, folded over t-shirt can do the trick.

Cheers!

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Old 06-17-2013, 08:21 PM   #4
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If you're going to place it in air, be sure to set a wider differential on your thermostat. Typically 3 -5 degrees will be sufficient. You don't want to keep cycling your compressor. If you're measuring the beer/wort temperature, you can set the differential to 1-2F because the liquids have higher specific heats than air.

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Old 06-17-2013, 08:43 PM   #5
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Quote:
Originally Posted by novahokie09
If you're going to place it in air, be sure to set a wider differential on your thermostat. Typically 3 -5 degrees will be sufficient. You don't want to keep cycling your compressor. If you're measuring the beer/wort temperature, you can set the differential to 1-2F because the liquids have higher specific heats than air.
I like even numbers so ill go with 4 degrees lol. Does this mean it will drop 4 degrees before turning back on? The unit is outside so it's gonna prob turn on and off all the time anyways just not as often
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Old 06-17-2013, 08:44 PM   #6
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Quote:
Originally Posted by Mozart
I also advise against putting the probe in water unless your certain it's waterproof.

What I do is tape my probe to the outside of the fermenting vessel. Air heats and cools more rapidly than liquid, and thus more rapidly that your fermenter. Not only will this keep your unit from cycling on and off as much, it's the temperature of the wort you want to control.

Adding a bit of insulation atop the probe after it's been affixed to the side of the fermenter also helps. Bubble wrap or an old, folded over t-shirt can do the trick.

Cheers!
So stick a bit under the probe so it's not directly touching the wall? Right now it's suspended
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Old 06-17-2013, 09:09 PM   #7
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Tape it to the side of your fermenter and the tape something like bubble wrap over it to insulate. The temp of the fermenting beer is what's important, not that of the surrounding air. You'll also find that it fluctuates less this way.

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Old 06-17-2013, 10:41 PM   #8
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If your setpoint is 64F and have a 4F differential, the freezer shouldn't power back on until 68F. The freezer only turns on above set point if you're operating in a cooling mode. If you're operating in a heating mode, the heater would turn on at 60F.

Ranco ETC controllers allow you to pick the operational mode with a touch of the button. I love these controllers.

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Old 06-17-2013, 11:00 PM   #9
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Dual post.

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Old 06-17-2013, 11:57 PM   #10
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Quote:
Originally Posted by BigFloyd
Tape it to the side of your fermenter and the tape something like bubble wrap over it to insulate. The temp of the fermenting beer is what's important, not that of the surrounding air. You'll also find that it fluctuates less this way.
Ah I see what your talking about. Thanks for the clarification. I got it set at 50 preparing it for when I do my red lager sometime soon but I also have my 5 gallon keg of German wheat in there. Can't wait for it to cool so I can have a cold one. Any suggestions to the psi I should set? I have it at 23 psi right now
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