Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Refractometer reading drifting up
LinkBack Thread Tools
Old 04-25-2010, 08:41 PM   #1
Feedback Score: 0 reviews
Join Date: Feb 2008
Location: Alpharetta, GA
Posts: 939
Liked 2 Times on 2 Posts

Default Refractometer reading drifting up

I took a Refractometer reading from the boil kettle - it reads 10.9 Brix. I put down the refractometer, record the reading and let it sit on my table. 5 Minutes later I pick it up and it reads 11.2 - another 5 minutes and it's now at 11.5 - slowly drifting up.

Does this have to do with the heat of the wort? Should I cool it down before reading or what else is going on?


In Keezer:
1. BCS - Wet Hopped West Coast Blaster
2. CYBI - Gordon's IPA Clone
3. BCS - Scottish -80
4. BCS - Specialty Saison (Gold Medal at BMO)
In Process:
1. BCS - Janet's Brown Ale (Fermenting)

Stevorino is offline
Reply With Quote Quick reply to this message
Old 04-25-2010, 09:37 PM   #2
Vendor and Brewer
Vendor Ads 
Feedback Score: 3 reviews
Bobby_M's Avatar
Join Date: Aug 2006
Location: Whitehouse Station, NJ
Posts: 22,429
Liked 1140 Times on 760 Posts
Likes Given: 28


It's definitely temp related. I use a pipette to grab the sample, then run a little cold water over the bulb for a 20 seconds before dispensing on the lens.

BrewHardware.com has a new website. Please check it out and let me know what you think!
New 100% Stainless Steel Heating Elements are IN! ULWD Ripple and 1500 watt versions coming soon
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc. Did you know we are also now a full service homebrew shop selling malt, hops, yeast (Wyeast), etc?
Bobby_M is offline
Reply With Quote Quick reply to this message
Old 04-25-2010, 09:57 PM   #3
Waste Allocation Load Lifter - Earth Class
Feedback Score: 0 reviews
passedpawn's Avatar
Join Date: Apr 2009
Location: ☼ Clearwater, FL ☼
Posts: 20,470
Liked 3973 Times on 2438 Posts
Likes Given: 3419


I've seen the same thing. It is due to the temp of the wort.

The automatic temp correction (ATC) of refractometers does not correct for hot wort. This ATC corrects for changes to the body of the refractometer.

The wort must be the same temp as the body of the refractometer. I always add 2 hot drops and set it down, then check in 5-10 minutes.

- Andrew
passedpawn is offline
Reply With Quote Quick reply to this message

Quick Reply
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Refractometer reading during boil :( MarsColonist General Techniques 6 04-04-2010 01:16 PM
Refractometer reading 4 Brix on 3 week old wort TheCookieMonster All Grain & Partial Mash Brewing 9 03-01-2010 01:37 PM
Refractometer reading after carbonation? nutty_gnome Equipment/Sanitation 4 10-14-2009 04:39 PM
Will carbonation through off a refractometer reading? jamesrm Equipment/Sanitation 3 05-22-2009 09:03 PM
Reading a Refractometer Gammon N Beer Equipment/Sanitation 2 12-30-2008 11:29 PM

Newest Threads