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Refractometer/Hydrometer reading

PostPosted: Fri Apr 09, 2010 11:26 pm
by gphall
Ever, ehem, forget to measure your OG? I know I have. I would like to see BeerTools Pro incorporate the ability to use both a Hydrometer AND Refractometer reading to back calculate the OG.

If needed, I can work out the mathmatical details for doing this. Let me know if assistance is needed.

Post ferment

PostPosted: Tue Apr 20, 2010 8:36 pm
by HumbleOpinion
I would also like to see support for refractometer reading post fermentation. The readings get skewed by the alcohol but there are formulas to correct them.

Re: Post ferment

PostPosted: Tue Apr 20, 2010 8:53 pm
by jeff
HumbleOpinion wrote:I would also like to see support for refractometer reading post fermentation. The readings get skewed by the alcohol but there are formulas to correct them.

To convert refractometer readings post fermentation the Window->Calculators->S.G.->Refractometer utility often proves useful. It takes into consideration the presence of alcohol in the sample.

Refractometer and hydrometer reading

PostPosted: Wed Apr 21, 2010 12:25 pm
by gphall
I am aware of that function. What I am asking is something different.

If you take a sample of finished beer, degas it, then take a hydrometer reading AND a refractometer reading... you can calculate the starting gravity and ABV.

This has been covered in BYO, do a google search for "BYO Refractometer Novemeber 2003". This method is also covered in the ASBC Methods of Analysis and I personally came up with a similar method based on the same physics/chemistry many many years ago when a friend forgot to measure his SG.

While I can easily bust out the old calculator and do the math myself... good brewing software does that for me so I'll be less prone to making mistakes.

Let me know if you are interested in putting this into BTP. I know I would like to see it.

Thanks.... and thatnks for the great software package. So far, I love it.