Comments for SeanTerrill.com http://gdmig-seanterrill.com If accidentally read, induce vomiting. Mon, 02 Nov 2020 19:12:04 +0000 hourly 1 https://wordpress.org/?v=5.5.6 Comment on Refractometer Calculator by webmaster http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20167 Mon, 02 Nov 2020 19:12:04 +0000 http://seanterrill.com/?p=2233#comment-20167 In reply to Scott.

Hey Scott, sorry I missed this. I think you’re talking about the Wort Correction Factor, which is independent of whether you’re using Brix or Plato. By default this is set to 1.04 and it looks like that’s what you’re using as well. If you click back to the article about using a refractometer you’ll find more info on determining your actual WCF.

Sean

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Comment on Refractometer Calculator by Scott http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20166 Thu, 22 Oct 2020 18:08:00 +0000 http://seanterrill.com/?p=2233#comment-20166 In reply to webmaster.

Just curious why when I input my Plato value into the Original RI box it calculates the Original Gravity down to a lower Plato value? For example my refractometer measured my pre-fermentation wort to be 16.3°P. After it’s calculated the resulting Original Gravity shows 1.064 or 15.67°P. Shouldn’t the OG measurement remain constant if the difference between brix and plato is interchangeable? Sorry for my confusion, but this is over my head and I want have a better understanding and be as close to accurate as possible. Thanks for taking the time to help!

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Comment on Refractometer Calculator by Scott http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20165 Thu, 22 Oct 2020 17:39:26 +0000 http://seanterrill.com/?p=2233#comment-20165 In reply to webmaster.

Thank you. That makes things easier to figure out.

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Comment on Refractometer Calculator by webmaster http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20164 Thu, 22 Oct 2020 16:25:16 +0000 http://seanterrill.com/?p=2233#comment-20164 In reply to Scott.

Hey Scott, for brewing purposes you can use degrees Brix and Plato interchangeably. They’ll be the same at least into the second decimal place. Hope that helps!

Sean

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Comment on Refractometer Calculator by Scott http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20162 Thu, 22 Oct 2020 03:09:12 +0000 http://seanterrill.com/?p=2233#comment-20162 I bought Hanna Instruments electronic refractometer for brewing which only gives measurements in degrees Plato. I find plato to brix conversion charts all over the Internet but find different values for conversion. Some brix values convert higher than plato values and some were lower. Do you have recommendations for accurate plato to brix conversion charts or calculators?

Thanks for the great information!

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Comment on Dry Yeast Viability by COMO PROPAGAR LEVADURA DESDE SEDIMENTOS DE OTRA ELABORACIÓN - La Maltería del Cervecero http://gdmig-seanterrill.com/2011/04/01/dry-yeast-viability/comment-page-1/#comment-20138 Thu, 17 Sep 2020 13:13:34 +0000 http://seanterrill.com/?p=2095#comment-20138 […] Dry Yeast Viability […]

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Comment on Refractometer Calculator by Peter Sargent http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20109 Fri, 04 Sep 2020 20:58:03 +0000 http://seanterrill.com/?p=2233#comment-20109 The presence of EtOH in beer does not bias the refractometer reading enough to explain the difference between the refractometer and hydrometer readings. However, when I take into account both its effects on the refractometer reading AND the hydrometer reading, I can come close to explaining the difference between the two readings.

See if this makes sense.

Refractive Index: The refractive index of a 5% solution of EtOH should be about 1.34020 at 15 degrees C, which converts to 1.005 when normalized to water. This suggests that refractometer readings of a 5% beer will be elevated by SG 0.005 (~1°Bx) solely because of the EtOH content.

Specific Gravity: 100% EtOH has a SG of 0.79 g/cc, so a 5% solution should have a SG of 0.990. This means that the hydrometer reading of a 5% beer will be 0.010 lower than expected solely because of the EtOH.

Taken together, the presence of EtOH in a 5% beer will produce a difference of SG 0.015 in refractometer vs. hydrometer. The four beers in my data set had an ABV of more than 5%, which means that I think that I can explain the difference that I saw (0.018).

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Comment on Refractometer Calculator by webmaster http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20100 Mon, 31 Aug 2020 19:02:09 +0000 http://seanterrill.com/?p=2233#comment-20100 In reply to Peter Sargent.

Peter, the difference is in fact due to the ethanol in solution: the refractive index from your example would correspond to a ~6°Bx reading on a refractometer. The entire working range in brewing only covers about 1.33-1.38.

Cheers,
Sean

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Comment on Refractometer Calculator by Peter Sargent http://gdmig-seanterrill.com/2012/01/06/refractometer-calculator/comment-page-2/#comment-20085 Thu, 27 Aug 2020 02:47:50 +0000 http://seanterrill.com/?p=2233#comment-20085 Thank you for this correction and for your past contributions to this subject.

I have data from a few brews suggesting that this correction yields an ABV estimate that is very close to the one calculated from a hydrometer-derived [(OG-FG)*131] formula.

Wort-corrected (1.040) refractometer readings in my hands are identical to wort hydrometer readings (avg. difference over four brews: 0.000). However, refractometer readings of beer at the time of kegging are much higher than hydrometer readings (by 0.019). Your correction puts the estimated ABV within 0.007 on either side of the hydrometer reading (average difference over four brews: 0%).

My question is why are the refractometer readings off for beer, but not for wort? It cannot be simply on account of the presence of EtOH; 10% EtOH has a refractive index only 0.5% (1 part in 200) different than water (1.34020 vs. 1.33345 at 15 degrees Celsius). What’s the explanation?

Thank you.

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Comment on Things I Hate #87: Mamma Mia! by Trisha http://gdmig-seanterrill.com/2009/06/23/things-i-hate-87-mamma-mia/comment-page-1/#comment-20075 Sat, 22 Aug 2020 16:07:32 +0000 http://seanterrill.com/?p=805#comment-20075 I thought I was the only one – as a female, I am supposed to love this awful,so called musical. My husbands business partner and wife actually gave me the DVD for Christmas one year, thinking it was probably a safe bet for a woman of a certain age, over 50. I took it to the charity shop, having tried to watch it once before and desperately failing. I couldn’t believe anyone could make someone so poor and it be so popular – do people have no taste?! No plot, awful singing, awful acting, dreadful, dreadful, embarressingly so, I quirmed in my seat. Worst of all, it has spoilt the Abba songs for me, which I am old enough to have liked the when they first came out. I just didn’t get this trying to fit something, anything, around songs that already existed, what is this about? Yes, I like the music (or did before the so-called musical) but why wring it out into some awful forced failure of a thing, just for money. The lack of integrity and any real point to it, just gets me so insensed with disgust.

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