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Calibrating the digital thermometer, is 212*F an accurate measure of boiling water

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dirtsailor2003

dirtsailor2003

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So I've read a few threads here on calibrating digital Thermometers using the 212* boiling point of water as an accurate gauge. The boiling point of water is 100°C or 212° F at 1 atmosphere of pressure (sea level). So even at sea level there will be a corrected temp depending on the barometric pressure. I don't want to bore anyone with the formula and all the other mombo jombo that goes with it. There is an online calculator one can use. You need to know your altitude and the barometric pressure. I have a home weather station that gives me all the info. If you do not you can use a gps to get elevation, or if you have an airport nearby you should be able to get elevation and the barometric pressure from their website.

For example the altitude where I live is 3640 and today's barometric pressure is 26.79 inches HG. the boiling point for water today is 205.46

My digital therm read 199 today in boiling water. Six degrees off, which is where it's been since the day I've owned it. I periodically test it just to make sure.

Here's a link to the online calculator:

http://www.csgnetwork.com/h2oboilcalc.html
 
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That'll work, but, unfortunately, the accuracy of thermometers isn't always linear, especially digital thermometers.
So, a thermometer could be dead on at 212 degrees, but, off at, say,145.

It's best to get a high-quality calibrated NIST thermometer for comparison, and check at several temperatures.



~Martin
 
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DiggingDogFarm said:
That'll work, but, unfortunately, the accuracy of thermometers isn't always linear, especially digital thermometers.
So, a thermometer could be dead on at 212 degrees, but, off at, say,145.
It's best to get a high-quality calibrated NIST thermometer for comparison, and check at several temperatures.
~Martin
Click to expand...
Martin,

That is correct. I just wanted to post this to add to the information in the threads that say to calibrate to 212*. Which isn't accurate for all locations.

Along the lines of the NIST therms I have a Maverick PT-100 Por-temp NISt/NSF, that I have been very happy with.
 
BUMP, great thread ! Deserves it IMHO ! Folks asking about temps, Temps being off on the boiling point ! Your temps may not be off as much as ya think !

Here ya go !

Great thread Case !
 
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dirtsailor2003 said:
So I've read a few threads here on calibrating digital Thermometers using the 212* boiling point of water as an accurate gauge. The boiling point of water is 100°C or 212° F at 1 atmosphere of pressure (sea level). So even at sea level there will be a corrected temp depending on the barometric pressure. I don't want to bore anyone with the formula and all the other mombo jombo that goes with it. There is an online calculator one can use. You need to know your altitude and the barometric pressure. I have a home weather station that gives me all the info. If you do not you can use a gps to get elevation, or if you have an airport nearby you should be able to get elevation and the barometric pressure from their website.

For example the altitude where I live is 3640 and today's barometric pressure is 26.79 inches HG. the boiling point for water today is 205.46
My digital therm read 199 today in boiling water. Six degrees off, which is where it's been since the day I've owned it. I periodically test it just to make sure.

Here's a link to the online calculator:

http://www.csgnetwork.com/h2oboilcalc.html
Click to expand...

Really great thread, missed this in my research.
Although this only changed my initial findings by a degree and a half....... that's a degree and a half !!!!
Here's my math math-i-ticle figure eq-at-tion, Baro is 29.67 tonight..... yep it's raining
Altit is 4498
 
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I know this is from awhile ago but I just came across it and was checking out the calculator. When I run it based on pressure I get one result and when I run it based on elevation I get a different result. Which would be more accurate, elevation which doesn't change or pressure which does? Thanks

**edit** I should have read further 
Oops.gif
 says right on the website that, "It should be noted that the only actual factor that is truly involved in the variance of boiling water is the pressure. Altitude is given as an alternative where and when pressure information is not available."
 
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