Fermentation A19AAT Analog temp controller

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edalcafa

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I did my first 5 gal AG Pale Ale last weekend and went pretty good OG 1.050 what I expected. Now fermentation is happening I think really well, however I am concern about temp controller. I am using analog Johnson A19AAT-2 set on 65F, and comparing with a digital temp inside freezer ambien temp swing 68.5F to 63F. I know a differential could be the reason but also want make sure if having the probe attach to glass Carboy or just hang inside freezer make difference. What would you recommend?
 
fwiw, I place my controller's temperature probe against the carboy, cover it with a ~4" square chunk of inch-thick closed cell foam, and pin both tight with a velcro strap.

The insulation provides sufficient isolation from the air temperature within the chamber that the probe registers within a half-degree of the same probe in a thermowell, even while the "ambient" within the ferm chamber is swinging rather dramatically with the compressor cycles.

A mechanical thermostat is never going to have the tight control of a digital unit, but folks got by with them.
And note that while the ambient is all over the place, what you care about is the beer in the fermentor, so if that's controlled well, don't get freaked out about air temperature ;)

Cheers!
 
Thanks for the reply. I am worry about beer getting off flavor due temperature, not sure if will worth make change at this time but I will attach the sensor to the Carboy and compare with some type of temperature reading on Carboy surface.

Cheers!
 
I attached the sensor to the Carboy and seems like is working now when I compared with a temperature tape indicator on surface of the Carboy. The fermentation started Saturday night, do you think my beer is affected by not having good control temperature on these days before?
 
Pretty much depends on the yeast strain you used, but assuming it was at least an ale yeast :) if the highest temperature your beer saw so far was 68.5°F I doubt there will be any major defects incurred...

Cheers!
 

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