Happy HolidaySs Giveaway - Winners Re-Re-Drawn - 24 hours to Claim!

Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Lower OG after boil??
Reply
 
LinkBack Thread Tools
Old 06-02-2008, 03:46 AM   #1
megavites
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2007
Location: Jackson, NJ
Posts: 177
Default Lower OG after boil??

So I brewed a Belgium pale ale today,
Doughed in and hit my target temp (152) for 60 min. Mashed out using slightly higher temps to get grain bed to 170, check. Now, my notes say
1.040 @135=1.055. I check 3 times and got within a point of that number.
After boil I ended up with 1.052??

The only thing I can think of is that I measued the OG before I got to
full volume, ie it was diluted further. But I'm sure I took a sample just before boil and corrected for temp to get my OG. Not sure what happened here. I'm confident of my calibrated digital thermo, so that's not it.

In the end it, the SG was to be 1.053 so It's right where I wanted it but just trying to figure out what happened. (BTW, I was not drinking today)

__________________

RIP-Ludweizen
Mac & Jacks African Amber clone,
-Dog Hair Pale Ale (Inspired by CWeston/Columbus Pale Ale)

megavites is offline
 
Reply With Quote Quick reply to this message
Old 06-02-2008, 04:05 AM   #2
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

Temperature compensation at 135F is not very accurate.
Did you take the pre-boil sample from the bottom of the kettle without stirring? That could explain things as the wort in the kettle will be denser at the bottom than the top.

-a.

__________________
ajf is offline
 
Reply With Quote Quick reply to this message
Old 06-02-2008, 05:45 AM   #3
Brett0424
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: dallas, tx
Posts: 266
Liked 1 Times on 1 Posts

Default

Also, you didn't say what your preboil and fermentation volumes were. If you added ice or water to dilute and ended with a higher volume of course your OG would be lower. I'm assuming this isn't the case though and agree with above post, your first reading probably wasn't that accurate.

__________________
Brett0424 is offline
 
Reply With Quote Quick reply to this message
Old 06-02-2008, 07:04 AM   #4
WBC
Feedback Score: 0 reviews
 
WBC's Avatar
Recipes 
 
Join Date: Jun 2007
Location: La Puente, CA, California
Posts: 2,175
Liked 8 Times on 8 Posts

Default

There is no way that sugar disappears. There is a measuring mistake.
Water boils off so it gets thicker. 1.040 can become 1.050. If you then add water it does become thinner or less OG.

__________________

Cheers,
WBC

Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
Tap 1: Bill's House Ale II, Tap 2: German Hefewizen, Tap 3: Nut Brown Ale
Future Brews: Stone IPA Clone, Blonde Ale, Budvar Clone, Newcastle Clone
New toy: Blichmann 27 gallon fermentor


“If you find yourself in a hole, the first thing to do is stop digging”

“Good judgment comes from experience, and a lotta that comes from bad judgment”

WBC is offline
 
Reply With Quote Quick reply to this message
Old 06-02-2008, 05:06 PM   #5
megavites
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2007
Location: Jackson, NJ
Posts: 177
Default

Quote:
Originally Posted by ajf View Post
Temperature compensation at 135F is not very accurate.
Did you take the pre-boil sample from the bottom of the kettle without stirring? That could explain things as the wort in the kettle will be denser at the bottom than the top.

-a.
This is probably the case. The wort wasn't stirred and all three samples
were from the bottom outlet valve. I do use Beersmith for temp compensation
and it appears pretty accurate as the sample cools, maybe within a point or two.

I'll stir next time.
__________________

RIP-Ludweizen
Mac & Jacks African Amber clone,
-Dog Hair Pale Ale (Inspired by CWeston/Columbus Pale Ale)

megavites is offline
 
Reply With Quote Quick reply to this message
Old 06-02-2008, 07:01 PM   #6
zoebisch01
Feedback Score: 0 reviews
 
zoebisch01's Avatar
Recipes 
 
Join Date: Nov 2006
Location: Central PA
Posts: 5,198
Liked 7 Times on 7 Posts

Default

Yeah, those two things are probable causes. Stratification of the sugar layers, stir really well. Temperature conversion is a non linear scale and the higher you go the more accurate you have to be on the measurements in both temperature and sp gravity, what is off by one point at high temp represents a much larger difference then when you are off at the calibration temp of the Hydrometer. You should take hot measurements with a grain of salt. One cool (no pun intended) idea I gleaned from a member is to place a pan (I use one of my SS fry pans) and stick it in the freezer. Pour your sample into there to cool rapidly, you can just put it back into the boil after you measure.

__________________
Event Horizon ~ A tribute to the miracle of fermentation.

Brew what you like. Do this, and you will find your inner brewer.
zoebisch01 is offline
 
Reply With Quote Quick reply to this message
Old 06-10-2008, 02:42 AM   #7
megavites
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2007
Location: Jackson, NJ
Posts: 177
Default It happened again??

Ok, I'm really confused now.
Brewed a Hefe last night and measured gravity before the boil, after strirring the boil kettle real good. Took three readings of the same sample at different temperatures, all were the same. (1.041)
Expected 1.053 after the boil and measured 1.041 again??

Thought maybe the hydrometer was bad and bought a new one today, did a comparison check and they both read the same. Two digital thermos read within 2 deg. of each other, and one of them is calibrated, so I'm at a loss as to why, after boiling off 3/4 to 1 gal, my gravity reading was the same.

Thoughts?

__________________

RIP-Ludweizen
Mac & Jacks African Amber clone,
-Dog Hair Pale Ale (Inspired by CWeston/Columbus Pale Ale)

megavites is offline
 
Reply With Quote Quick reply to this message
Old 06-10-2008, 03:47 AM   #8
WBC
Feedback Score: 0 reviews
 
WBC's Avatar
Recipes 
 
Join Date: Jun 2007
Location: La Puente, CA, California
Posts: 2,175
Liked 8 Times on 8 Posts

Default

This will help. During your brewing when you take a sample you must stir well and scoop out your sample (Do not drain samples from a ball valve unless well purged) and save it in the fermentation refrigerator because that is close to 65F. Put all the samples in the same refrigerator. When you are all done brewing you can read your samples more accurately because they are at the right temperature and you have rested a while and can devote your full attention to getting good readings. Accuracy depends on accurate volumes of water as well as ingrediants too. No guessing allowed.

__________________

Cheers,
WBC

Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
Tap 1: Bill's House Ale II, Tap 2: German Hefewizen, Tap 3: Nut Brown Ale
Future Brews: Stone IPA Clone, Blonde Ale, Budvar Clone, Newcastle Clone
New toy: Blichmann 27 gallon fermentor


“If you find yourself in a hole, the first thing to do is stop digging”

“Good judgment comes from experience, and a lotta that comes from bad judgment”

WBC is offline
 
Reply With Quote Quick reply to this message
Old 06-10-2008, 03:53 AM   #9
megavites
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2007
Location: Jackson, NJ
Posts: 177
Default

Damm, I guess I'm going to have to brew another batch test this out.

__________________

RIP-Ludweizen
Mac & Jacks African Amber clone,
-Dog Hair Pale Ale (Inspired by CWeston/Columbus Pale Ale)

megavites 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
how to lower water pH minduim Beginners Beer Brewing Forum 21 06-30-2012 05:10 PM
Are initial S.G. #'s usually lower than post boil #'s bmckee56 All Grain & Partial Mash Brewing 5 08-24-2009 07:54 PM
OG lower that should be beerbelay Extract Brewing 4 05-18-2009 03:45 AM
Greetings from Lower Alabama sevenmag Introductions 3 11-04-2008 07:16 PM
greetings from lower Michigan JWHooper Introductions 7 07-31-2008 07:47 PM



Newest Threads

LATEST SPONSOR DEALS