Calibrating thermometers

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Calibrating thermometers

Postby Lindsay Dive » Thu Apr 05, 2001 2:58 pm

Can anyone tell me how to calibrate a thermometer?
Lindsay Dive
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What kind?

Postby JLaw » Fri Apr 06, 2001 6:06 pm

If it has a needle and dial, not a digital or mercury thermometer, it should have a hex nut attached to the stem, on back of the face. Keep the thermometer in a known temperature solution, glass of ice water works best (32 degrees). Then put a wrench on the hex nut and hold it firmly, turn the face (dial) of the thermometer and turn it to the correct temperature. The face may not turn easily, that's okay, just keep turnin'! As for digital thermometers, some you can calibrate, some you can't. Depends on the manufaturer. And I know of no way to calibrate a mercury thermometer. Hope this helps some.

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Alcohol & mercury

Postby Lindsay Dive » Fri Apr 06, 2001 6:25 pm

The thermometres I have are the alcohol and mercury type. I placed both of them in boiling water (I live right near the beach/ sea level.)the mercury thermo was reading right on 100 deg c and the other which is an alcohol filled thermometer was reading 92 degrees c. I wanted to know if you can actually alter this type of thermometer. I also wanted to know how you can check to see if they are correct at say 67 degrees c which is probably the most important temp we need.
Lindsay Dive
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Thermometers

Postby HugeElvis » Fri Apr 13, 2001 8:56 am

You can't actually calibrate the liquid filled thermometers, but you can use a "factor" to +/- to the reading. Get the reading of boiling water and ice water. Hopefully the variance will be the same for both temperatures. The reading at 67 degrees should be close if the high and low readings are simliar. If they are way off, ask your local homebrew shop or buddies if they know anybody that works in a lab that has access to NIST rated thermometers. They can compare your thermometer reading to theirs and tell you the offset.
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Thermometers

Postby Lindsay Dive » Sun Apr 15, 2001 3:29 pm

I do know a lady who works in a lab. I shall take you advice and talk to her.
Lindsay Dive
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