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Michael Chu
Joined: 10 May 2005
Posts: 1654
Location: Austin, TX (USA)
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 Posted: Tue Jan 08, 2013 7:28 am Post subject: Re: calibration of thermometers |
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| twinbo wrote: | | What liquid, as does water at 212, indicate a specific temperature in some manner? |
This is actually pretty tricky. That's one of the reasons why I own multiple Thermapens (although it doesn't explain why I need as many as I have). When using another thermometer, I compare against a thermapen so see if it is calibrated (for example, for frying oil with a frying/candy thermometer). I double check the thermapens against each other once in a while to verify they are still calibrated (or at least in sync - I assume that if they do go out of calibration it is unlikely that they would all go out of calibration in exactly the same way and same amount, especially since they were all manufactured and calibrated by Thermoworks at different times). I understand that's not a reasonable solution for most people, but if you need accuracy, it might be worth getting one Thermapen as none of mine have gone out of calibration in any part of the range that I work with (32F to about 400F) regularly and it has been somewhere around 8 years since I got my first one. |
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Jim Cooley
Joined: 09 Oct 2008
Posts: 377
Location: Seattle
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| Posted: Tue Jan 08, 2013 4:54 pm Post subject: |
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| This raises an interesting question which occured to me many years ago. I acquired some 6 or 7 mercury bulb thermometers at a garage sale and wanted to figure out which was the most accurate. So I stuck them in my mouth one by one and recorded each one's reading. Graphed the results and then picked the median. Chances are they could ALL be off, but I figured that was the best statistical approach without a reference point. |
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Michael Chu
Joined: 10 May 2005
Posts: 1654
Location: Austin, TX (USA)
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| Posted: Wed Jan 09, 2013 11:14 am Post subject: |
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| Jim Cooley wrote: | | Chances are they could ALL be off, but I figured that was the best statistical approach without a reference point. |
Another way would be to take advantage of known temperatures of water at sea level... 32 F for ice water, 212 F for boiling water. Pour 6 oz of boiling water into a large measuring cup with 6 ounces of 10 oz of ice cold water (ice cubes removed!) and it should (briefly) be at 99.5F (probably a little less because boiling water cools rapidly). Use much larger quantities of both to give yourself a larger time window to use the thermometers before the water cools substantially. |
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Jim Cooley
Joined: 09 Oct 2008
Posts: 377
Location: Seattle
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| Posted: Wed Jan 09, 2013 5:59 pm Post subject: |
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| Hey, that's pretty clever! Didn't occur to me at all. |
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Antilope
Joined: 03 Jan 2013
Posts: 11
Location: Sacramento, CA
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| Posted: Sun Jan 13, 2013 7:16 pm Post subject: |
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magzmom
Joined: 08 Dec 2013
Posts: 1
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| Posted: Sun Dec 08, 2013 9:26 pm Post subject: submission |
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Thank you for the offer.
I'd keep the spoils for myself, but share with many a guest to feast at my table.
This holiday season, we are making divinity. I cook all year on my big green egg.
Some other need always supplants the ability to purchase an adequate temperature gauge -- winter clothes, school supplies.
Came here today for a recipe that I've made for years. Thanks. Engineers are hawt. |
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