Cool mash for OG reading? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Cool mash for OG reading?
Cool Brewing Giveaway - Supporting Membership Drive & Discount

Reply
 
Thread Tools
Old 08-22-2007, 05:47 PM   #1
skifast1
 
skifast1's Avatar
Recipes 
 
Mar 2006
Lake Zurich, IL
Posts: 293
Liked 3 Times on 3 Posts



AG n00b question: After forgetting to take an OG reading on my first AG attempt (d'oh!), I'm getting ready for round 2 with EdWort's Haus Ale. As I'm planning out the steps a question occurred to me: does anyone bother to cool their mash sample for a 'spot on' OG reading, or do ppl just figure 'ah, pretty close to 150 deg' and adjust the OG reading accordingly?

I'd be tempted to just adjust for temp, as the time spent cooling the sample could be used for more productive purposes, say, sampling another homebrew

Thx!


__________________
"Those are my principles, and if you don't like them...well, I have others" --Groucho Marx


Primary: echos
Secondary: Nukey Brown
Keg 1: echos
Keg 2: echos
Bottled: Wind 'er Up Winter Ale


 
Reply With Quote
Old 08-22-2007, 07:12 PM   #2
Beerthoven
 
Beerthoven's Avatar
Recipes 
 
May 2007
Cary, NC
Posts: 2,158
Liked 31 Times on 27 Posts


I always adjust for temp, which I measure with a thermometer. Its easy.


__________________

Primary/Secondary: --
Kegged: #129 Northern English Brown
Planned: Classic APA, Red IPA

 
Reply With Quote
Old 08-22-2007, 07:17 PM   #3

When I first started AG brewing I used to take a pre-boil gravity. I couldn't be bothered anymore. I'm very consistently getting at least 80% now so I don't worry about it. If you are going to take the readings though, definitely cool the sample first (just throw it in the freezer, it doesn't take long to cool). The farther the wort is from the calibration temp of the hydrometer the less accurate the reading.

That said I have been considering getting a refractometer. While I'm not so worried about my pre-boil gravity I am concerned about over sparging and extracting tannins.
__________________
Brad
Canadian Brewers Unite!


Projects: Sylvania Kegerator Conversion, Tower Cooling, Grain Milling Station

 
Reply With Quote
Old 08-22-2007, 07:46 PM   #4
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 22,978
Liked 1584 Times on 1021 Posts


I only take an SG at the tail end of my runnings from the second batch sparge and do so for note taking only. It's mostly to see how well I've done sparging. If the efficiency is low and I noted a 1.020+ reading, I know I could have sparged more to fix that. If it's an off flavor and I noted a 1.010 or lower reading, I might have pulled some tannins. It's just good for troubleshooting.
__________________
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 08-22-2007, 08:16 PM   #5
FlyGuy
 
FlyGuy's Avatar
Recipes 
 
Jan 2007
Calgary, Alberta
Posts: 3,604
Liked 176 Times on 51 Posts


Quote:
Originally Posted by bradsul
That said I have been considering getting a refractometer. While I'm not so worried about my pre-boil gravity I am concerned about over sparging and extracting tannins.
Brad -- check this out: http://cgi.ebay.com/ws/eBayISAPI.dll...MESE:IT&ih=014
This is the same refractometer and vendor that I purchased. They guy is in Vancouver and charges reasonable shipping. The unit works flawlessly, and it is REALLY convenient. You definitely won't regret it!

 
Reply With Quote
Old 08-22-2007, 08:19 PM   #6
BierMuncher
...My Junk is Ugly...
HBT_MODERATOR.png
 
BierMuncher's Avatar
Recipes 
 
Jan 2007
St. Louis, MO
Posts: 12,375
Liked 775 Times on 432 Posts


Maybe I'm a little too comfortable. I don't take a reading until I'm racking out of the cooled kettle into the primary. What's done is done and I just want to get a mark for ABV readings later on.

 
Reply With Quote
Old 08-22-2007, 08:25 PM   #7
desertbronze
Recipes 
 
Jul 2007
Posts: 385
Liked 3 Times on 3 Posts


I just place a cup of wort in a bucket of cold water. Take a reading when the wort has cooled to 60 or so - just for curiosity. Doesn't take too much effort - but I agree with BierMuncher - what's done is done. I just go with whatever the gravity is - I don't try to adjust it with water or extract.

 
Reply With Quote
Old 08-22-2007, 08:41 PM   #8
FlyGuy
 
FlyGuy's Avatar
Recipes 
 
Jan 2007
Calgary, Alberta
Posts: 3,604
Liked 176 Times on 51 Posts


I tend to do the same (not bother until I am done), but there is something to be said for knowing your efficiency before you go into the boil.

If you have a new system or your process isn't very repeatable, you really want to know whether you significantly under-shot or over-shot your mash efficiency. If you did, it is going to affect your hop utilization and your bitterness-to-gravity ratio, which is one of the most important taste aspects of your finished beer. If you have an idea that your are above or below concentration of fermentables going into the boil kettle, at least you then have the opportunity to re-calculate your hop utilization and predicted IBU's, and then make last-minute corrections to your hop additions, if required.

 
Reply With Quote
Old 08-22-2007, 08:43 PM   #9
Brewsmith
 
Brewsmith's Avatar
Recipes 
 
Aug 2005
Torrance, CA
Posts: 6,247
Liked 62 Times on 58 Posts


I take a cup or so out of the end of the boil with a pyrex cup and put it in the fridge. When everything is pitched, cleaned and put away the sample is under 80 and ready to go for measurement and tasting.
__________________
Fermenting:#160 Apollo/Calypso Pale Ale
Kegged:#153 Old Helicon Barleywine 2013, #157 Irish Red, #158 Mosaic IPA, #159 Bravo/Delta ESB
Up Next:Brown Porter, American Stout, Imperial Stout
My Recipes
Tuba Sonata

Smith & Co. Custom Tap Handles

 
Reply With Quote
Old 08-22-2007, 08:46 PM   #10
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 22,978
Liked 1584 Times on 1021 Posts


Like I mentioned, I don't test in order to compensate. I just do it to compare my sparge methods for learning purposes.


__________________
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
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
2 or 3 gallon boils - cool all 5 gallons or cool boil first? pcrawford Extract Brewing 15 01-31-2013 01:47 AM
Priming Solution: To Cool or Not To Cool Pelikan General Techniques 17 04-07-2009 12:49 AM
Cool That Wort!! Cool That Wort!! What Works For You? shagington All Grain & Partial Mash Brewing 37 10-20-2008 07:29 PM
Partial Mash Temperature Reading dipflop All Grain & Partial Mash Brewing 3 07-17-2008 05:12 PM
Cool Box Mash Tun BlightyBrewer All Grain & Partial Mash Brewing 19 03-01-2006 08:26 AM


Forum Jump