Refractometer FG - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Refractometer FG

Reply
 
Thread Tools
Old 04-12-2009, 06:14 PM   #1
avaserfi
Recipes 
 
Nov 2008
College Station, TX
Posts: 622



I just kegged a wheat today and measured the FG with my refractometer and hydrometer. With the refractometer I get 5 brix, after accounting for the OG of 1.048 that reads as about 1.003. Meanwhile, the hydrometer reads at 1.011. Both are calibrated and temperature adjusted. Also, I am always within 2 points when comparing the two prior to fermentation.

Is this because I am measuring a wheat which typically have more particles in them than most other beers? This is the first time I have used my refractometer for FG calculations.


__________________
Andrew

 
Reply With Quote
Old 04-12-2009, 08:13 PM   #2
jkarp
Recipes 
 
Jun 2008
Elizabeth, CO
Posts: 2,088
Liked 44 Times on 34 Posts


Refractometers can only provide a very rough approximation when alcohol is present. Trust hydrometer readings for FG.



 
Reply With Quote
Old 04-12-2009, 08:32 PM   #3
avaserfi
Recipes 
 
Nov 2008
College Station, TX
Posts: 622


I figured the hydrometer is more accurate, but I have read that most people are within a couple points when comparing the two devices. Just trying to figure out what is going on.
__________________
Andrew

 
Reply With Quote
Old 04-12-2009, 08:38 PM   #4
greencon
Recipes 
 
Sep 2008
Farmington, MI
Posts: 55
Liked 2 Times on 2 Posts


Check out this tutorial and spreadsheet. Could help

MoreBeer!: Using a refractometer in brewing | MoreBeer
__________________
Michigan Mashers HBT
Motor city Mashers
Primary:
Denny's Rye IPA
Northern Brewer IPA
Honkers Ale Clone
On Tap:
Auby American Wheat
Citra Plale Ale
Centennial Blonde

BioHopology Likes This 
Reply With Quote
Old 04-12-2009, 08:42 PM   #5
Denny's Evil Concoctions
Grande Megalomaniac
HBT_LIFETIMESUPPORTER.png
 
Denny's Evil Concoctions's Avatar
Recipes 
 
Oct 2005
West Kelowna BC, Canada
Posts: 7,736
Liked 65 Times on 51 Posts


Do you use beersmith? There's an adjustment tool in there.
__________________
I may not be an expert, but I did stay at a Holiday Inn Express........ 6 months ago.

http://www.homebrewtalk.com/f39/denn...9/#post1766281

http://groups.homebrewtalk.com/Tapro...ook_Repository

 
Reply With Quote
Old 04-12-2009, 08:46 PM   #6
avaserfi
Recipes 
 
Nov 2008
College Station, TX
Posts: 622


I used Beersmith's adjustment tool, Morebeers and some other site I found. They all had the same results. Both the refractometer and hydrometer have been recently calibrated in distilled water. Something is causing such a large discrepancy, my guess is that I made a wheat and the extra particles are causing issues with the refractometer, but I am not too sure if this is right or not. It is just a guess.
__________________
Andrew


 
Reply With Quote
Old 04-13-2009, 05:18 PM   #7
Catt22
Recipes 
 
Jan 2009
Posts: 4,998
Liked 68 Times on 61 Posts


There's a fair chance that your OG was lower than you thought. A 1.034 OG and a 5 Brix would corrdspond to the 1.011 SG you reported. A lot depends on how confident you are of the 1.048 OG number.



 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Refractometer, which is best? Jumbo82 Equipment/Sanitation 10 07-02-2009 11:52 PM
I tried a refractometer- not so hot Hammer General Beer Discussion 32 10-28-2008 02:42 PM
Refractometer akamatt Equipment/Sanitation 15 08-08-2008 08:51 PM
Which Refractometer Sherpa FE All Grain & Partial Mash Brewing 16 02-05-2008 05:03 PM
refractometer ROAD MUTANT Equipment/Sanitation 20 06-21-2006 05:16 AM


Forum Jump