Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Where to put temp control probe?
Reply
 
Thread Tools
Old 01-17-2010, 01:24 AM   #1
blk94f150
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Northern KY
Posts: 215
Liked 1 Times on 1 Posts

Default Where to put temp control probe?

I have a Ranco temp controller and I've just been taping it to the side of the fermentation vessel so that it tries to keep the beer at exactly the temp I'm looking for. My concern is that it might make the freezer get too cold and stall out the fermentation.

For example, I just pitched Wyeast 1084 Irish Ale yeast as 70F and I'm going to let it start fermenting and then drop it to around 62-64 for a clean Irish Red. However I'd think that the freezer would cool much faster than the beer and it might get to be below freezing in the freezer before the beer gets to my desired temp. Then it would continue to get colder and stall out the process.

Any thoughts?

Mike


__________________
Total noob.
blk94f150 is offline
 
Reply With Quote
Old 01-17-2010, 04:26 AM   #2
Douglefish
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Posts: 243
Liked 1 Times on 1 Posts
Likes Given: 1

Default

Currently I am taping my probe to the fermenter with a little insulation on the outside. I think it's important to try to measure the temp of the liquid, not the ambient air. My question is how much off is temp when taped to the vessel?


Douglefish is offline
 
Reply With Quote
Old 01-19-2010, 12:50 AM   #3
defenestrate
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
defenestrate's Avatar
Recipes 
 
Join Date: Sep 2008
Location: edgewater, MD
Posts: 1,085
Liked 7 Times on 7 Posts

Default

if you have any room in freezer, i would put another glass or gallon jug full of water and submerge the probe if possible. that way if you set it to 60, the freezer will only run until the sensor reads 60 and then it will kick off. thats how my keezer is set up.
__________________
(dē-fěn'ĭ-strāt') To throw out of a window.
defenestrate is offline
 
Reply With Quote
Old 01-19-2010, 02:21 AM   #4
flyweed
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2008
Posts: 420
Liked 9 Times on 9 Posts

Default

you need a thermowell in your stopper, and that way the probe actually sits down in your fermenting liquid, and you actually measure the temp of your product, and not the air around it.

Dan
__________________
5 gal secondary: Strawberry Mead
1 gallon secondary: Blood orange Mead
1 gallon secondary: Grape Mead
On Tap: Blackberry Blonde Ale
On Tap: Apple/Cherry Hard Cider
flyweed is offline
 
Reply With Quote
Old 01-19-2010, 12:32 PM   #5
Conehead
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Cavan, Ontario, Canada
Posts: 98
Liked 6 Times on 5 Posts

Default

How does the thermowell work with a blow-off hose? Does it get in the way?

Conehead
Conehead is offline
 
Reply With Quote
Old 01-19-2010, 02:32 PM   #6
smizak
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2007
Location: Buffalo, NY
Posts: 1,821
Liked 107 Times on 77 Posts
Likes Given: 78

Default

IMO, thermowell = sanitation risk. I have a homemade temp controller and I just tape the probe to the carboy. No insulation. It might cycle a bit at first, but I've tested mine by keeping a floating thermometer in a carboy full of water and it's dead nuts on. If you don't believe me, you can listen to the Brewstrong podcast regarding temperature control on the The Brewing Network. Jamil does the same thing, and he reports that the glass of the carboy is almost exactly the same temp as the beer.
__________________
"This song goes out to me because I'm so f*ckin' cool!"~John Reis
smizak is offline
 
Reply With Quote
Old 01-19-2010, 02:41 PM   #7
david_42
Feedback Score: 0 reviews
 
david_42's Avatar
Recipes 
 
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,674
Liked 142 Times on 134 Posts

Default

With the probe taped to the outside of the carboy, the freezer will shut off earlier than if you had the probe in the wort. This will tend to balance out the slight over-shoot that is typical of a freezer. The thermal mass of the wort is high enough to damp out the variations.
__________________
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk
david_42 is offline
 
Reply With Quote
Old 01-21-2010, 03:17 PM   #8
snail
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2008
Posts: 325
Liked 13 Times on 5 Posts

Default

Quote:
Originally Posted by smizak View Post
IMO, thermowell = sanitation risk. I have a homemade temp controller and I just tape the probe to the carboy. No insulation. It might cycle a bit at first, but I've tested mine by keeping a floating thermometer in a carboy full of water and it's dead nuts on. If you don't believe me, you can listen to the Brewstrong podcast regarding temperature control on the The Brewing Network. Jamil does the same thing, and he reports that the glass of the carboy is almost exactly the same temp as the beer.
I just listened to the same podcast and agree with you. Putting a glass of water with the probe in it doesn't accurately measure the temperature of the ferment because there is heat that is generated by the yeast which the glass of water doesn't have. So taping it to the side of the carboy with a little insulation covering it will give you a very accurate reading of the fermenting temp.
snail is online now
 
Reply With Quote
Old 01-21-2010, 05:51 PM   #9
raceskier
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2007
Location: Port Townsend, Washington
Posts: 607
Liked 1 Times on 1 Posts

Default

A lot of good points here.

The attachment to the side with insulation is a good non-intrusive compromise.

My solution is similar. I wrap the carboy with one of these sports injury gel packs. The large contact area and thermal mass of the gel pack allow it to track the temperature of the carboy very closely. I then insert the probe between the gel pack and carboy. The probe is then surrounded by material tracking the wort temp.
Click image for larger version

Name:	Gel Pack.jpg
Views:	1676
Size:	49.3 KB
ID:	14413  
__________________
Primary: , Boddington's Clone, Mirror Pond w/Marris Otter
Secondary:
Bottled: Fullers ESB Clone
Kegged: Mirror Pond Clone
Drinking: BM's Kona Fire Rock, Dead Guy Clone, Alaskan Amber Alt Clone, Firestone DBA Clone, Magnum/Crystal IPA
Next up: Burton IPA
raceskier is offline
 
Reply With Quote
Old 01-22-2010, 08:42 AM   #10
StMarcos
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Location: Sebastopol, CA
Posts: 969
Liked 31 Times on 26 Posts
Likes Given: 1

Default

I modded my conical to accept an RTD probe. I use it to monitor the temp of the beer during the ferment. However, I control off another RTD that is in a large test tube of water. Know the beer temp, and have vary small temp fluctuations. Best of both worlds IMO.


StMarcos is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fermentation temperature control using internal probe stephelton Fermenters 17 08-03-2009 06:30 PM
Temp. Probe Dwain Equipment/Sanitation 1 05-01-2009 07:48 PM
Johnson Temp Control Probe=waterproof? slim chillingsworth Equipment/Sanitation 7 07-10-2008 09:38 AM
Good Temp Probe? jayhoz Equipment/Sanitation 10 04-10-2007 03:52 PM
blichmann temp probe insco2 Equipment/Sanitation 9 12-25-2005 08:04 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS