IR Guns

 
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Lightning
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Post by Lightning » Thu. Dec. 02, 2021 9:24 pm

BunkerdCaddis wrote:
Thu. Dec. 02, 2021 9:04 pm
Ice water on the other hand... :yes:
Right on partner ;)

 
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Post by Sunny Boy » Thu. Dec. 02, 2021 9:42 pm

Ice water can be warmer than 32F - the water is not freezing. Just as water turns into ice it should be 32 F.

And when it starts to get a "rolling boil", it should be 212F. My IR gun reads that boiling temp true every time.

Paul

 
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Post by joeq » Thu. Dec. 02, 2021 10:18 pm

Lightning wrote:
Thu. Dec. 02, 2021 8:22 pm
Um lol.. I didn't want to state the obvious but,,,, it is possible for ice to be colder than 32 degrees lol
You mean Franky in the calibration lab lied to me!? :o
(We have dry ice in work, and it's rated at 109° below zero. So I guess varying ices (?) could have different temps too. Maybe he had the refrigerator in work set at 32. :roll:


 
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Post by joeq » Thu. Dec. 02, 2021 10:20 pm

Sunny Boy wrote:
Thu. Dec. 02, 2021 9:42 pm
Ice water can be warmer than 32F - the water is not freezing. Just as water turns into ice it should be 32 F.

And when it starts to get a "rolling boil", it should be 212F. My IR gun reads that boiling temp true every time.

Paul
OK Paul, next I'll give boiling water a try. thanks for the tip. And once it boils, I'll send you my water, to see if your IR gun reads the same as mine. ;)

 
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Post by BunkerdCaddis » Thu. Dec. 02, 2021 10:57 pm

Sunny Boy wrote:
Thu. Dec. 02, 2021 9:42 pm
Ice water can be warmer than 32F - the water is not freezing. Just as water turns into ice it should be 32 F.
And when it starts to get a "rolling boil", it should be 212F. My IR gun reads that boiling temp true every time.
A mixture of ice and water will always be 32F, it is in it's phase change where it requires the transfer of heat energy to accomplish that. Yes, you can have water at 32F and ice at 32F it takes as much energy to go thru the phase change as it does to change one degree (if I am remembering my jr high science correctly). The phase change of water to steam is the same way. You can have water at 212F and steam at 212F (excluding pressurized vessels)

 
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Post by Sunny Boy » Fri. Dec. 03, 2021 8:53 am

BunkerdCaddis wrote:
Thu. Dec. 02, 2021 10:57 pm
A mixture of ice and water will always be 32F, it is in it's phase change where it requires the transfer of heat energy to accomplish that. Yes, you can have water at 32F and ice at 32F it takes as much energy to go thru the phase change as it does to change one degree (if I am remembering my jr high science correctly). The phase change of water to steam is the same way. You can have water at 212F and steam at 212F (excluding pressurized vessels)
Under the right conditions in a lab.

For the rest of us in our kitchens trying to test an IR gun, water will be warmer unless the air temp is also near freezing point. The water picks up room heat.

Ask yourself which happens,.... set a bowl of ice cubes and water on your kitchen counter and see is the water freezes because of the ice in it being cold, or the ice melts because of the water being warmer ?

Paul


 
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Post by Lightning » Fri. Dec. 03, 2021 2:11 pm

Its accurate enough to calibrate with..

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Post by Lightning » Fri. Dec. 03, 2021 4:36 pm

The reason this works is because it takes a huge amount of energy to turn 32 degree ice into 32 degree water. To raise the temperature 1 degree of one pound of ice only takes 1 BTU. But to change that same pound of water from ice to liquid requires 144 BTUs. So the ice water settles at the freezing point every time.

Same happens turning water to steam. The transition takes a whopping 970 BTUs per pound.

 
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Post by BunkerdCaddis » Fri. Dec. 03, 2021 5:23 pm

Yeah what Lee said. When I worked in a Burger King (in a previous :what: life) that's how we calibrated the test thermometers. Unlike fauci science this happens to be real science... :lol:

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