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Old 06-27-2012, 01:21 AM   #1
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Default Last two beers dis not ferment out

Could it be the hot temp lately? I don't have a controlled environment to ferment in. Can I dose them with another batch of yeast? Both stalled around half way to desired fg.

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Old 06-27-2012, 01:39 AM   #2
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Could it be the hot temp lately? I don't have a controlled environment to ferment in. Can I dose them with another batch of yeast? Both stalled around half way to desired fg.
Heat would make them ferment more strongly. How are you measuring gravity? All-grain or extract? Recipes? Starter or no?

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Old 06-27-2012, 01:54 AM   #3
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All grain, with starters. Beers are black ipa and cream ale. Both with 1056. Both had vigorous fermentations initially. I recently switched to a spectrometer from a hydrometer. I calibrated it. Could it be off? Never had a problem before.

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Old 06-27-2012, 01:57 AM   #4
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All grain, with starters. Beers are black ipa and cream ale. Both with 1056. Both had vigorous fermentations initially. I recently switched to a spectrometer from a hydrometer. I calibrated it. Could it be off? Never had a problem before.
A refractometer? Are you correcting for alcohol in the beer?
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Old 06-27-2012, 02:08 AM   #5
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Yeah, one of those things. How do I correct for alcohol?

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Old 06-27-2012, 02:11 AM   #6
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Yeah, one of those things. How do I correct for alcohol?
Try an online calculator like this one.

You have to correct for the presence of alcohol in solution. I bet your beers finished just fine.
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Old 06-27-2012, 11:47 PM   #7
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I'm a little confused, because my refractometer reads both brix and grav. My og was 1.049 and my fg is 1.024 for the cream ale. That is not fully fermented. But if I go by brix and run it through the calculator you provided I am money. What am I missing.

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Old 06-28-2012, 12:42 AM   #8
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You go by brix and correct it to specific gravity with alcohol present. It measures refracted light so it doesn't matter what the scale is named it still needs to be corrected for alcohol.

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Old 06-28-2012, 02:58 AM   #9
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The initial reading for Brix is correct. The SG next to it is a correct calculation. Once fermentation begins and alcohol is present, the SG readout is useless. So is the Brix reading unless you convert. You must know the original Brix reading. When you take a new reading you must then compensate for the presence of alcohol using a chart like the one mentioned above.

Example: Say your original Brix reading was 15. That's a SG of 1.062. Let's say your final reading is 8 Brix. If you don't convert, 8 Brix = 1.032. You would think your beer has stalled and must suck! But if you start with 15 Brix and finish with 8 Brix your finished gravity is actually 1.013...

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Old 06-28-2012, 03:07 AM   #10
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Does it taste sweet? Forget math, use your senses, then see if the math matches. We get too hung up I. The tech and forget our own built in hydrometers.

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