Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!


Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Refractometer adjustment for fermenting wort
Reply
 
LinkBack Thread Tools
Old 05-01-2011, 08:05 PM   #1
reim0027
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Posts: 414
Liked 3 Times on 3 Posts

Default Refractometer adjustment for fermenting wort

Beersmith has a tool to convert your refractometer reading to SG. I have 3 options. The first is unfermented wort, second is fermenting wort, and finished wort.

My question is why the conversion? My SG comes in much lower with the conversion than the unfermented wort conversion. Is it because the alcohol bends the light differently and that needs to be compensated for?

Sorry, first batch with a refractometer (it is an ATC, BTW).

Side note, I don't know if it will help. I am fermenting a light lager. My OG was 9B and now it is 3.9B (1.035 -> 1.004), this is a week into fermentation. Tastes ok, no sour flavors noted, predominant malty sweetness, color pale with good clarity.

__________________
reim0027 is offline
 
Reply With Quote Quick reply to this message
Old 05-01-2011, 08:17 PM   #2
AZ_IPA
PKU
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
AZ_IPA's Avatar
Recipes 
 
Join Date: Jun 2008
Location: The Cold Part of AZ
Posts: 43,505
Liked 6272 Times on 5443 Posts
Likes Given: 817

Default

Quote:
Originally Posted by reim0027 View Post
My question is why the conversion? My SG comes in much lower with the conversion than the unfermented wort conversion. Is it because the alcohol bends the light differently and that needs to be compensated for?
Yes.

And the conversions with the various programs are not always accurate. You're better off using a hydrometer for ferementing and feremented wort.
__________________
AZ_IPA is online now
 
Reply With Quote Quick reply to this message
Old 05-01-2011, 08:37 PM   #3
reim0027
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Posts: 414
Liked 3 Times on 3 Posts

Default

Hmm. Maybe I'll do a few side-by-side comparisons, checking Beersmith's accuracy. Thanks bro.

__________________
reim0027 is offline
 
Reply With Quote Quick reply to this message
Old 05-01-2011, 09:02 PM   #4
DeafSmith
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DeafSmith's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Richardson, TX
Posts: 1,448
Liked 33 Times on 31 Posts
Likes Given: 9

Default

Here's some more info:

http://seanterrill.com/2010/06/11/re...final-gravity/
http://seanterrill.com/2010/07/20/to...r-correlation/
http://seanterrill.com/2011/04/07/re...er-fg-results/

I haven't used any of this yet, so I don't know how accurate it is, just thought it might be of interest.

__________________
DeafSmith is offline
 
Reply With Quote Quick reply to this message
Old 05-01-2011, 09:05 PM   #5
reim0027
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Posts: 414
Liked 3 Times on 3 Posts

Default

Great, I'll check them out. I'm about ready to take a hydro reading (letting the sample warm up) to check my Beersmith. I'll read those articles. More info is always better.

__________________
reim0027 is offline
 
Reply With Quote Quick reply to this message
Old 01-19-2013, 05:17 PM   #6
ajf
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
ajf's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Long Island
Posts: 4,643
Liked 99 Times on 93 Posts
Likes Given: 39

Default

When I need to determine if fermentation is complete, I use the refractometer and take a Brix reading (but don't try converting to SG. When the Brix reading stops dropping, fermentation is done, and I can take a single hydrometer reading to get an accurate result.

Sean Terrill's calculator has been the least inaccurate calculator that I have found, but it still isn't as accurate as the hydrometer.

[Doh] Didn't realize how old this thread was. [/Doh]

-a.

__________________

There are only 10 types of people in this world. Those that understand binary, and those that don't.


Reason: Added Doh
ajf is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Taking Fermenting Wort and putting it into New Wort bierzwinski Fermentation & Yeast 16 11-13-2012 12:18 AM
Does incandescent light have an effect on fermenting wort? velorider11 Fermentation & Yeast 17 09-08-2011 02:04 PM
Wort fermenting before I pitched starter. Wild yeast? Should I be concerned? Vintage63 Fermentation & Yeast 3 06-27-2011 02:41 PM
My wort isnt fermenting... burninmules Fermentation & Yeast 5 04-06-2011 09:14 PM
Can I use bottom fermenting yeast with a beer kit that comes with top fermenting yeas kcusmc Fermentation & Yeast 4 03-16-2010 08:07 PM



Newest Threads

LATEST SPONSOR DEALS