Author Topic: Quick (dumb?) OG, FG question  (Read 1015 times)

Offline anje

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Quick (dumb?) OG, FG question
« on: January 24, 2012, 03:40:57 PM »
If I read OG and FG at the same temperature, do I have to correct for the variation from 60F? Or will they remain accurate relative to each other?

(And why, exactly, is the temperature for this not the standard 20C?)
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Offline a10t2

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Re: Quick (dumb?) OG, FG question
« Reply #1 on: January 24, 2012, 03:52:55 PM »
The relative offsets will be the same, so if all you want is to determine ABV, and you're using a simplified formula like
Code: [Select]
131(OG-FG), you'll be fine.

Calibration temperature depends on the instrument. I have one that's 20°C.
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Online mtnrockhopper

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Re: Quick (dumb?) OG, FG question
« Reply #2 on: January 25, 2012, 06:52:59 AM »
(And why, exactly, is the temperature for this not the standard 20C?)

Probably because American manufacturing mostly uses english, not metric, measurements and hydrometers were designed for commercial brewing.
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Offline bluesman

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Re: Quick (dumb?) OG, FG question
« Reply #3 on: January 25, 2012, 07:09:31 AM »
Some are calibrated at 60F and others at 68F. It should be recorded on your hydrometer.
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