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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Refractometer readings in BRIX
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Old 04-07-2013, 05:03 PM   #1
bobtheUKbrewer2
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Default Refractometer readings in BRIX

I use software obtained via this forum to convert refractometer readings to BRIX, and have noticed that if OG is 15 BRIX a FG of 5 BRIX gives a certain specific gravity. However if OG = 10 BRIX 5 BRIX is now a different specific gravity. Any thoughts?


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Old 04-07-2013, 08:28 PM   #2
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5 brix will always be 1.020-ish. However what I'm wondering is are you using a refractometer to measure FG? Because if you are you'll need to use a formula to figure out what it really is because the alcohol will throw the reading off.

I don't personally use a refractometer but from what I've read on here, some people report that even with the corrections it's still not entirely accurate for FG.


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Old 04-07-2013, 08:58 PM   #3
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I just posed this question to my L.H.B.S and the old guy has been doin brews for a very long time he says refractometer is def no good for FG.
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Old 04-07-2013, 09:43 PM   #4
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As long as you have the original gravity and a good calculator (beersmith) a refractometer for FG works perfectly! I haven't used a hydrometer in over a year...
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Old 04-07-2013, 09:51 PM   #5
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Originally Posted by jbsengineer View Post
As long as you have the original gravity and a good calculator (beersmith) a refractometer for FG works perfectly! I haven't used a hydrometer in over a year...
I've never found any of those formulas or calculators to work well for FG. They seemed to work great until I attempted to verify the reading with a hydrometer.
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Old 04-07-2013, 11:26 PM   #6
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I've never found any of those formulas or calculators to work well for FG. They seemed to work great until I attempted to verify the reading with a hydrometer.
I should also mention I use a digital refractometer. I found I was inaccurate trying to pinpoint the line in a standard refractometer. After I calibrated my hydrometer and testing pre and post fermentation with the digital I couldn't find a difference.
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Old 04-08-2013, 01:03 AM   #7
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I use my refractometer for all readings except FG.
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Old 04-08-2013, 04:40 AM   #8
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Quote:
Originally Posted by bobtheUKbrewer2 View Post
I use software obtained via this forum to convert refractometer readings to BRIX, and have noticed that if OG is 15 BRIX a FG of 5 BRIX gives a certain specific gravity. However if OG = 10 BRIX 5 BRIX is now a different specific gravity. Any thoughts?
The software in question is used to offset the error created by the alcohol in the sample. A higher Brix OG for the same Brix FG suggests that there is more alcohol in the sample and requires more error correction.
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Old 04-08-2013, 10:13 PM   #9
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What he said. Refractometer until the wort goes in the fermenter. Hydrometer to check FG. That is all.
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Old 04-08-2013, 10:28 PM   #10
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great app on the iPhone, BrixCalc. Works like a charm. Many have tested OG and FG with the hydrometer as a comparison, and the error from reading the hydrometer would offset any error in the differences between the two. In higher gravity beers the difference becomes greater and might require a hydrometer sample.


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