Varying OG Readings - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Brew Science > Varying OG Readings

Thread Tools
Old 03-29-2013, 03:45 PM   #1
Sep 2008
Posts: 2,061
Liked 180 Times on 135 Posts

I have an interesting problem. I boil 10 gal. batches in keggle with a recirculating pump. When I take gravity readings from the bottom of the kettle via the recirc line they are consistently 5-7 points lower than the readings when just skimming some wort of the top. These measurements are taken with both a calibrated hydrometer and refractometer. Both instruments reading match when taken from the same source. I always thought that 11 gallons of boiling wort would be pretty homogenous. Is there any chance that some stratification could be taking place or another reason I am getting varying, yet predicatable gravity readings?
Check out my nanobrewery!!/pages/Two...02323289804018

Reply With Quote
Old 04-01-2013, 03:57 PM   #2
WoodlandBrew's Avatar
Oct 2012
Malden, MA
Posts: 2,191
Liked 247 Times on 201 Posts

Are you letting the samples cool to room temperature before taking the measurements? I've noticed a 1B change from hot to cold tap water with my refractometer which is about what you might expect with a hydrometer as well.
The 2nd edition is now available: Brewing Engineering
Woodland Brewing Research Blog Applied Science for Better Beer.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Varying Fermentation Temperatures The_Canmancan Fermentation & Yeast 9 11-08-2012 09:06 PM
Varying OG using Beersmith 2 kh54s10 Brewing Software 1 04-09-2012 05:55 PM
Varying mash efficinecies Tall_Yotie All Grain & Partial Mash Brewing 2 01-31-2011 05:38 AM
Varying OG Readings from a Refractometer wendelgee2 Equipment/Sanitation 2 11-29-2010 06:57 PM
Varying temperatures for keg VictimKBrew Bottling/Kegging 1 11-19-2010 02:24 PM

Forum Jump