Page 24 of 24 FirstFirst ... 14222324
Results 231 to 235 of 235
  1. #231

    Quote Originally Posted by jakeslouw View Post
    If your water doesn't have the necessary minerals, then yes, it could affect your yeast.
    And the pH (a result of water chemistry) will also effect enzyme efficiancy and conversion during the mash.

    The reason I ask is that I took FG readings of 2 beers (I brewed them the same way except for the water that is different) there is a big difference in the attenuation.

    Ill have a look at all the numbers today when I have all the info at hand. Maybe I just skrewed things up somewhere else along the line.



    Sent from my SM-G930F using Tapatalk
    Last edited by Harhm; 14th November 2017 at 10:07. Reason: http://www.wortsandall.co.za/showthread.php?1602-Confused-about-how-this-went-wrong&p=11770

  2. #232
    I posted the info and same question here.

  3. #233
    Junior Member
    Join Date
    Apr 2015
    Location
    Somerset West
    Posts
    16
    When using a refractometer to measure OG and FG, which calculator/table would you guys recommend to calculate ABV? Brewers' Friend, Northern Brewer, Sean Terrill, ABV Apps - all seem to give you different answers for the same data. I brewed a Porter with an OG of 12.9 Brix and a FG of 5.8 Brix. I would expect to get a ABV of around 5-5.5%



    Sent from my Vodacom Power Tab 10 using Tapatalk

  4. #234
    Senior Member
    Join Date
    Dec 2014
    Location
    Hartbeespoort/De Wildt
    Posts
    964
    Quote Originally Posted by AbriDS View Post
    When using a refractometer to measure OG and FG, which calculator/table would you guys recommend to calculate ABV? Brewers' Friend, Northern Brewer, Sean Terrill, ABV Apps - all seem to give you different answers for the same data. I brewed a Porter with an OG of 12.9 Brix and a FG of 5.8 Brix. I would expect to get a ABV of around 5-5.5%
    A refractometer struggles to read the correct FG:

    Refractometers and Alcohol:
    In the presence of alcohol, refractometer measurements get even more complicated. Alcohol throws off the refraction even more. The good news is, it can be corrected for if the OG is known. Sean Terrill posted research on the subject and arrived at the following equation which we have taken to be the most accurate:
    FG = 1.0000 – 0.0044993*RIi + 0.011774*RIf + 0.00027581*RIi – 0.0012717*RIf – 0.0000072800*RIi + 0.000063293*RIf
    http://seanterrill.com/2011/04/07/re...er-fg-results/

  5. #235
    Junior Member
    Join Date
    Apr 2015
    Location
    Somerset West
    Posts
    16

    Quote Originally Posted by jakeslouw View Post
    A refractometer struggles to read the correct FG:

    Refractometers and Alcohol:
    In the presence of alcohol, refractometer measurements get even more complicated. Alcohol throws off the refraction even more. The good news is, it can be corrected for if the OG is known. Sean Terrill posted research on the subject and arrived at the following equation which we have taken to be the most accurate:
    FG = 1.0000 0.0044993*RIi + 0.011774*RIf + 0.00027581*RIi 0.0012717*RIf 0.0000072800*RIi + 0.000063293*RIf
    http://seanterrill.com/2011/04/07/re...er-fg-results/
    Thanks! His calculator is one of the ones I used. Gives me 5.1% ABV, which is what I would expect

    Sent from my Vodacom Power Tab 10 using Tapatalk

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •