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Old 05-02-2014, 02:27 PM   #11
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Fermentation generates heat. If you have the bulb in a separate container of water, your beer is certain to be warmer during fermentation. The bulb should be attached and insulated on the side of your fermentor, or submerged in the wort using a thermowell.
More good advice, thanks.

How exactly does a thermowell work, and how does it work in conjunction with a temp controller?
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Old 05-02-2014, 03:26 PM   #12
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Stc-1000 was designed as an aquarium controller so yes, it is waterproof.

A thermowell is just a stainless steel tube, crimped on one end that you submerge in the wort through a drilled stopper. The temperature sensor for a thermometer or temp controller goes inside so you can accurately monitor the beer temp.

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Old 05-02-2014, 03:35 PM   #13
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Are those black plastic/rubber thermoprobes that come with an STC-1000 waterproof?
Yes they are waterproof but not wort/beer/alcohol proof. I read someone had it immersed into beer for a week or so and it got all gummy, looked like it was dissolving.
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Old 05-02-2014, 09:28 PM   #14
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I tape my probe directly to the side of the fermenter, using a folded up paper-towel between the probe and the tape to act as an insulator. Works very well. As others have pointed out, a separate jug of water that you submerge the probe in won't work since fermentation generates its own heat.

For that particular temp controller (Johnson A19) make sure to verify the temperature. I use that same controller for my kegerator but discovered the temp I set the dial to is a couple of degrees off from the actual temp inside my kegerator.

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Old 05-03-2014, 02:34 PM   #15
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I checked the temp controller by leaving the probe in a jug of water overnight, with the temp set at 68°. I, again, got a reading of 61° on the Thermapen, which is right around the same temp I was getting with the probe just dangling in the freezer. So, it's a good 7-8° off.

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Old 05-03-2014, 02:51 PM   #16
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Search for a thermowell on more beer . Com. They work great and are not too expensive. I think I paid 30 bucks. You need to control the temperature of the beer INSIDE the fermenter. This accomplishes that.

Fermentation temps can go way above ambient temps that water jugs etc would measure.


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Old 05-03-2014, 03:08 PM   #17
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Search for a thermowell on more beer . Com. They work great and are not too expensive. I think I paid 30 bucks. You need to control the temperature of the beer INSIDE the fermenter. This accomplishes that.

Fermentation temps can go way above ambient temps that water jugs etc would measure.
Yeah, I understand that now. I'm just trying to figure out exactly how far off the dial is on this temperature controller.

I could understand ±2-3°, but 7°? That's shoddy.
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Old 05-04-2014, 04:10 AM   #18
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My Johnson controller is way off too. I use that one on my keezer, so I just adjusted until pints of beer were at my desired temp and left it there. I just built an STC-1000 for my ferm chamber. That's a bit more accurate.

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Old 05-04-2014, 12:31 PM   #19
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On the question of where to put the probe to read fermentation temp, it's already been answered. Simultaneous readings taken using a probe in a thermowell stuck into the middle of the vessel vs. one taped to the side and insulated have yielded an insignificant +/- 1.0*F difference.

If you think about the geometry of a cylinder, there's a greater volume of beer around the outside of the fermenter than in the very middle, so taping to the outside and insulating provides a very accurate idea of the temp for the overall volume of liquid. There's no need to submerge anything into the liquid.

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