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Old 07-31-2008, 05:31 PM   #1
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Default Floating vs Lab Thermometer

When I am mashing, why does this thermometer (floating)

http://www.northernbrewer.com/pics/f...hermometer.jpg

Read different than this one? (Lab)

http://www.northernbrewer.com/pics/f...hermometer.jpg

And which one do I trust.

The floating one is placed in the mas vertically. Should It be in there horizontally for an accurate reading. The floating one says I am right on for my mash temp, the lab one says I am about 6* lower...

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Old 07-31-2008, 05:41 PM   #2
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Just put them both in Boiling water to check calibration and they both read 212 on the Dot (line...lol) The floating one just took a little longer to get there. My gut tells me to trust the floating one...

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Old 07-31-2008, 05:43 PM   #3
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I had a floating thermometer that said my water boiled at 205. Scared the crap out of me because I noticed mid mash that my floater said I was at 143 when I was aiming for 150 in my mash. I couldn't figure out how I missed so badly. Threw that thing away.

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Old 07-31-2008, 05:48 PM   #4
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Hmmm interesting.

Mine seems to be the reverse problem

Floating one says temp is higher not lower than the lab thermo.

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Old 07-31-2008, 05:54 PM   #5
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This is exactly why it's so important to calibrate your thermometer. I check mine periodically, whenever I get boiling water going, for whatever reason.

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Old 07-31-2008, 06:22 PM   #6
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Just be careful if your at elevation, water boils at lower temps than 212f.

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Old 07-31-2008, 07:36 PM   #7
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My floater reads lower than my lab by about 6*.

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Old 07-31-2008, 07:45 PM   #8
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Make sure your lab thermometer is immersed properly.

Mine has a white line for minimum immersion depth at about 8" on a 14" thermometer.

You wouldn;t think it matters much. But it does.

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Old 07-31-2008, 08:07 PM   #9
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Quote:
Originally Posted by GilaMinumBeer View Post
Make sure your lab thermometer is immersed properly.

Mine has a white line for minimum immersion depth at about 8" on a 14" thermometer.

You wouldn;t think it matters much. But it does.
Seriously, mine is a Total Immersion which means the whole thing has to be in the liquid to get a really accurate reading. I usually leave it about an inch below the reading.
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Old 07-31-2008, 08:34 PM   #10
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Im having all kinds of issues with my thermometers also my floater reads 200 at boiling.

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