refractometer question - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > refractometer question

Reply
 
Thread Tools
Old 10-20-2012, 10:45 PM   #1
kranak
Recipes 
 
Sep 2010
Cleburne, TX
Posts: 77
Liked 7 Times on 2 Posts



I have noticed something that is odd to me when measuring the og with my refractometer. Like I am sure most are, it has brix on the left side and gravity points on the right. An example of what is messing with me is this. Todays beer ended with a brix of 23, which on the right side of the refractometer reads about 1.088. When I compare 23 brix to online tables or enter that amount in the refractbeer excel sheet it says I am closer to 1.096.This is with og measurement so no fermentation has occurred. Which one is right?

 
Reply With Quote
Old 10-20-2012, 11:37 PM   #2
kranak
Recipes 
 
Sep 2010
Cleburne, TX
Posts: 77
Liked 7 Times on 2 Posts


Btw this is a refratometer from ahs that has atc if that helps. http://www.austinhomebrew.com/produc...oducts_id=1014

 
Reply With Quote
Old 10-20-2012, 11:50 PM   #3
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,199
Liked 1657 Times on 1071 Posts


It looks like you may have a dud scale there. The units I have put 23 brix at around 1.096 also.
__________________
Welcome to BrewHardware.com. I love you.
BIAB Large Mesh False Bottoms and SS HERMS COILS are IN!!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Old 10-20-2012, 11:54 PM   #4
kranak
Recipes 
 
Sep 2010
Cleburne, TX
Posts: 77
Liked 7 Times on 2 Posts


Odd, it the printed scale. Nothing to be calibrated, or that can move. It would be odd but completely possible that it was printed incorrectly.

 
Reply With Quote
Old 10-21-2012, 03:11 PM   #5
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,199
Liked 1657 Times on 1071 Posts


They are made in China afterall.
__________________
Welcome to BrewHardware.com. I love you.
BIAB Large Mesh False Bottoms and SS HERMS COILS are IN!!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Old 10-21-2012, 03:27 PM   #6
dbrewski
Recipes 
 
Oct 2011
Indeterminate
Posts: 1,014
Liked 52 Times on 46 Posts


Quote:
Originally Posted by kranak
Odd, it the printed scale. Nothing to be calibrated, or that can move. It would be odd but completely possible that it was printed incorrectly.
I am checking mine out as we speak. I grabbed the dual scale from homebrewfinds.com. using it yesterday I had a similar discrepancy. Luckily I had my old brix-only unit to fall back on.

 
Reply With Quote
Old 10-21-2012, 03:44 PM   #7
dbrewski
Recipes 
 
Oct 2011
Indeterminate
Posts: 1,014
Liked 52 Times on 46 Posts


I calibrated both refractometers with 68F water and did some measurements. My old one is dead nuts accurate. The dual scale brix side was pretty darn close...but the SG scale was completely off. Yes I could have checked that just by looking at the scale without even taking a sample but I wanted to check everything. So, brix side, very close. SG side - ignore. No wonder this thing was $24.95. I got this off of ebay and will get no refund, but you might want to talk to AHS as they are a reputable store on the off chance that you just got a bad one.

I have to say one positive is that the scale inside when you are viewing is huge...it's much larger than my original unit, so it reads easier. I'll probably use it just because of that. How's that for putting whipped cream on horsesh*t?

 
Reply With Quote
Old 10-21-2012, 03:55 PM   #8
ajf
Senior Member
HBT_LIFETIMESUPPORTER.png
 
ajf's Avatar
Recipes 
 
Oct 2005
Long Island
Posts: 4,646
Liked 105 Times on 99 Posts


The brix scale is a measure of the amount of sucrose in a solution. Wort contains very little sucrose, but relatively large amounts of maltose and maltotriose. The conversion from brix to S.G. is different for a wine must (almost 100% sucrose) and beer wort (mainly maltose and maltotriose). Because of this, it is not possible to have a S.G. scale on the refractometer that is accurate for both beers and wines. Most refractometers with a dual scale have an S.G. scale calibrated for wine, but there may be some where the S.G. scale is calibrated for beer. Even if you have one that is calibrated for beer, the calibration will change slightly, depending on what went into the wort.

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

 
Reply With Quote
Old 10-21-2012, 03:56 PM   #9
kranak
Recipes 
 
Sep 2010
Cleburne, TX
Posts: 77
Liked 7 Times on 2 Posts


Ill send a note to Austin, but at least I know to read the brix side. I broke my hydrometer so I had nothing to check against.

 
Reply With Quote
Old 10-21-2012, 04:25 PM   #10
dbrewski
Recipes 
 
Oct 2011
Indeterminate
Posts: 1,014
Liked 52 Times on 46 Posts


Quote:
Originally Posted by ajf View Post
The brix scale is a measure of the amount of sucrose in a solution. Wort contains very little sucrose, but relatively large amounts of maltose and maltotriose. The conversion from brix to S.G. is different for a wine must (almost 100% sucrose) and beer wort (mainly maltose and maltotriose). Because of this, it is not possible to have a S.G. scale on the refractometer that is accurate for both beers and wines. Most refractometers with a dual scale have an S.G. scale calibrated for wine, but there may be some where the S.G. scale is calibrated for beer. Even if you have one that is calibrated for beer, the calibration will change slightly, depending on what went into the wort.

-a.
I did not know that. Interesting. So brix is actually a wine-making scale. Professional brewers use Plato if I understand it correctly, and we homebrewers use SG. I have wondered why there were so many scales, this provides at least one answer.

DrBrew809 Likes This 
Reply With Quote


Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Refractometer question breez7 Equipment/Sanitation 5 10-21-2012 10:10 PM
Refractometer question Vongo All Grain & Partial Mash Brewing 44 04-14-2011 07:09 PM
refractometer question? goose1873 Equipment/Sanitation 10 06-17-2010 07:41 PM
Refractometer Question luthierzan Equipment/Sanitation 1 06-03-2010 02:27 PM
Refractometer question: 32% vs. 40% camiller Equipment/Sanitation 9 07-29-2009 01:16 PM


Forum Jump