What I meant is that, all else being equal, the published attenuations will maintain their relationships to one another. 1056 will most likely attenuate more than 1968, for example, even though the actual attenuations may not be in the published ranges.

Sean

]]>When you say “the attenuation ranges published by yeast labs are comparative, not prescriptive,” what exactly do you mean? Comparative to what?

]]>You might consider these parts, instead, which are be better material choices for a sanitary environment (brewing):

1/4″ MPT to female flare adapter:

https://www.amazon.com/gp/product/B008E5CUFG — Brass

1/4″ NPT Female Tee fittings:

https://www.amazon.com/Parker-4-4-4-Brass-Fitting-Female/dp/B00NEFYPJK — Brass

https://www.amazon.com/Stainless-Steel-Fitting-Class-Female/dp/B003GSKXEG — Stainless Steel

Are you sure Eaton Whitehead provides the correct link? I followed the link and purchase from Amazon and it seems like the diameter is 1.25″ not 0.25″. Please reply.

Thanks,

Todd

If you compare the Hydro OG to your refractometer original reading. (Change the value to 1 to use the calculator to find the unadjusted gravity rating of your refractometer.)

Calculate the percentage difference and change the default 1.04 to your scale. (6% difference would be 1.06, 3% difference would be 1.03, etc)

]]>Is there a calculator that will adjust it’s FG readings for the presence of alcohol?

All conversions and calculators I can find assume the refractometer gives a brix scale. But this one doesn’t. It only gives gravity down to 1.000. Or even the formula to create a new field in your spreadsheet download to convert?

I found the conversion =261.3*(1-1/x) where X is the SG reading. But it doesn’t adjust for your wort correction factor.

]]>“Justin,

The twelve data points used to develop the correlation had OGs from 1.036 to 1.106, FGs from 1.007 to 1.022, and ADFs from 73% to 91%. As long as you stay in those ranges, the results should be fairly accurate. If one or more of them gets near the margins, though, you may get better results from a hydrometer. It all depends on what kind of precision you want/need.

Just as an example, I recently brewed a Belgian Blonde with an OG of 1.041 and an FG of 1.005. The OG and ADF (88%) are both in range, but because they’re both near the margins the correlation didn’t give very accurate results (estimated FG was 1.009). I would guess that both of your beers would give good results, because the gravities are marginal but the attenuations are more typical. Again, it just depends on what you personally consider acceptable.

Cheers,

Sean”