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> Using a refractometer and hydrometer, Infering OG and abv
Thorhale
post Sep 11 2012, 10:54 PM
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So I failed to measure my beer untill after fermentation. I figure it's time to break out the refractometer to test the formulas on brewheads.com

www.brewheads.com/refract-getog.php
www.brewheads.com/refract-getabw.php

Using my tools on a control, I accurately (about .1 %) measured a canned beer, so far so good.

This beer in question was 75 # of light dry dme and 3 # of piloncillo in an undetermined volume of beer. To ferment in a 60 wine barrel, I attempted to eyeball the final volume of 45 gallons. Any way, something isn't adding up...

My measurements were 8.6 Plato and 1.008 Sg. The above calculators indicated a OG of 1.076 and abv at nearly 10%.

That would put my attenuation over 90%! I fermented with a powdery yeast at and above 80 F, that explains high attenuation, bet 90% seems far too high when the software I'm using suggests I should have expected 76%.

This post has been edited by Thorhale: Sep 11 2012, 10:58 PM
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Thorhale
post Sep 16 2012, 04:13 AM
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I feel like I have asked this question before, the response is still a bit vague. See this thread: http://www.homebrewtalk.com/f128/calculati...tometer-354260/

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Thorhale
post Sep 20 2012, 05:27 AM
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I have been experimenting further. It was my first time seeing golden monkey by victory so I had to try it. After noticing some similarities to the beer I made, I decided to measure it. Fg was 1.010, ball parking me at a .7% difference. Do you think this suggests I passed 10% abv? It is in a wine barrel, possibly there is some discrepancy because of a wild fermentation? It certainly doesn't taste like 10% abv.

This post has been edited by Thorhale: Sep 20 2012, 05:29 AM
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