Adjusting Hydrometer readings for temp. - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Adjusting Hydrometer readings for temp.

Reply
 
Thread Tools
Old 07-25-2008, 03:09 PM   #1
Mr. Awesome
Recipes 
 
Jan 2008
Posts: 86


During all grain brewing, do you take the pre-boil hydrometer reading immediately after the sparge when the water is still 180 degrees? How do you adjust for that high temperature to get anything near an accurate reading.

I'm sure this is a bit of a dumb question, it just left me confused.

 
Reply With Quote
Old 07-25-2008, 03:11 PM   #2
Drunkensatyr
 
Drunkensatyr's Avatar
Recipes 
 
Apr 2007
Posts: 1,997
Liked 17 Times on 13 Posts


Chill the sample down 1st

 
Reply With Quote
Old 07-25-2008, 03:12 PM   #3
Bytor1100
Recipes 
 
Mar 2008
Utah
Posts: 544
Liked 2 Times on 1 Posts


I use a refractometer for my preboil gravities, since it automatically adjusts for temperatures.

You can cool down a wort sample by putting ice around the sample container. Or you can take the gravity reading, take the wort temperature, then adjust the gravity reading to the temperature.
__________________
30 Gallons - Malty Moe APA

 
Reply With Quote
Old 07-25-2008, 03:26 PM   #4
farmbrewernw
Recipes 
 
Jan 2008
Richland, WA
Posts: 1,574
Liked 5 Times on 5 Posts


yep cool the sample down
__________________
Schlonghammer Ales
It well...it tastes.......more fuller
_________________________
I'm working as a pro now, but that doesn't mean I'm not still homebrewing. I'm going to see if I can homebrew at work as a way to develop new recipes.

Quote:
Originally Posted by Zymurgrafi
wow, tha more I drink, tha more cohernet you all are!
and stufffff.

 
Reply With Quote
Old 07-25-2008, 03:31 PM   #5
Drunkensatyr
 
Drunkensatyr's Avatar
Recipes 
 
Apr 2007
Posts: 1,997
Liked 17 Times on 13 Posts


Quote:
Originally Posted by Bytor1100 View Post
take the wort temperature, then adjust the gravity reading to the temperature.

Not a good practice to place a room temp thin glass hydro in 170º + liquid but yes you "can" do it.


Throw the sample in the freezer for about 10 min then adjust for temp when it gets 90º or lower.

 
Reply With Quote
Old 07-25-2008, 03:41 PM   #6
ohiobrewtus
 
ohiobrewtus's Avatar
Recipes 
 
Nov 2006
Ohio
Posts: 7,785
Liked 62 Times on 54 Posts


Quote:
Originally Posted by Drunkensatyr View Post
Throw the sample in the freezer for about 10 min then adjust for temp when it gets 90º or lower.
This is what I do as well. For me anyway, the whole purpose of a preboil reading is to find out if I need to make adjustments before I start the boil.

I think that this is what you're looking for:

http://www.ebrew.com/primarynews/ct_...correction.htm
__________________
Quote:
Originally Posted by the_bird
Well, if you *love* it.... again, note that my A.S.S. has five pounds.

 
Reply With Quote
Old 07-25-2008, 04:20 PM   #7
HairyDogBrewing
Recipes 
 
Feb 2008
Mechanicsburg, PA
Posts: 571
Liked 5 Times on 5 Posts


I chill a sauce pan in the freezer before I start the mash.
It has enough mass to cool a cup of wort down PDQ.

 
Reply With Quote
Old 07-25-2008, 05:21 PM   #8
carnevoodoo
Recipes 
 
May 2007
San Diego, CA
Posts: 4,276
Liked 17 Times on 16 Posts


I would put it in the freezer when I had that issue. Now I use my refractometer.

I found though, that most of the time my numbers are insanely consistent and I don't need to worry about preboil gravity. I just take it now because the refractometer is fun.

 
Reply With Quote
Old 07-25-2008, 05:29 PM   #9
beerthirty
big beers turn my gears
HBT_LIFETIMESUPPORTER.png
 
beerthirty's Avatar
Recipes 
 
May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 32 Times on 14 Posts


I set it in the fridge in labeled cups along with 1st and 2nd running cups. while the BK is coming to boil I take the readings then dump them into the boil. my #'s are fairly consistent from batch to batch runnings also, I do it simply to check efficiency.
__________________
Quote:
Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

 
Reply With Quote
Old 07-25-2008, 06:29 PM   #10
Saccharomyces
Be good to your yeast...
HBT_LIFETIMESUPPORTER.png
 
Saccharomyces's Avatar
Recipes 
 
Jun 2008
Pflugerville, Texas
Posts: 5,447
Liked 115 Times on 69 Posts


I haven't had good luck adjusting for temperature, so I started cooling my samples, but I quickly got tired of that so I bought a refractometer..
__________________
[How to Calculate Mash Efficiency | Do I Need a Yeast Starter? | My Ghetto Fermentation Chamber | Twitter | 6 Gal. HDPE Fermenters | Slanting Yeast | No Sparge Brewing]

Quote:
Originally Posted by Soperbrew
big brother only monitors facebook and untappd

 
Reply With Quote


Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hydrometer readings woodenbuick General Beer Discussion 1 03-24-2009 01:50 AM
Hydrometer Use: Adjusting Reading For Temperature Mutilated1 General Techniques 6 11-28-2007 06:50 PM
Hydrometer readings z987k All Grain & Partial Mash Brewing 9 11-05-2007 06:19 PM
Hydrometer readings Willy Boner Extract Brewing 4 09-29-2007 02:00 PM
Taking Temp and Hydrometer readings brewawan Beginners Beer Brewing Forum 6 01-20-2007 04:46 AM


Forum Jump