quote:
Gravity to Brix Accuracy Typical dual scale refractometers use a linear 4 x gravity to Brix conversion. That’s fine and dandy up until around 1.049. At that point this linear scale starts to become inaccurate. Brix 11 does equal 1.044, but Brix 12 does not equal 1.048. It is 1.049. It’s only 1 point off here, but up at Brix 24, it’s up to 5 points off. Brix 24 equals 1.101 not 1.096.

This is my understanding of the problem.

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Posted by Fratastic423

Baton Rouge

Member since Feb 2007

5990 posts

Posted on 3/24/15 at 8:32 am to s14suspense

I knew that it became inaccurate as the number grew but that for most of my beers it is close enough for me.

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Posted by BugAC

St. George

Member since Oct 2007

52951 posts

Posted on 3/24/15 at 8:35 am to s14suspense

I was always under the impression that refractometer's were fairly easy to read. Didn't realize there were factors to consider.

I need to get one of these, because i believe my hydrometer readings are skewed.

For instance, a couple homebrews ago, as i finished up my boil, i took my thief and grabbed a sample. Added my hydrometer, got a reading and wrote it down. I then took my hydrometer and put it directly in my brew kettle and took a reading. The 2 were off pretty significantly. I don't remember the exact OG's but i think the OG in the hydrometer was around 1.058 and the reading from the brew kettle was 1.052/050 (adjusted for temperature). So for some reason, my densities were different from the thief to the brew kettle. My only thought was that maybe, some of the trub got gathered up in the thief, making the wort in the thief more dense.

Which made me think, i need a refractometer.

This post was edited on 3/24/15 at 8:37 am

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