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sharksfan7
Joined: 19 Jul 2010 Posts: 2
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Posted: Mon Jul 19, 2010 5:55 pm Post subject: IR Thermometers & Emissivity |
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I have a question about infrared thermometers and I figured this would be the best place to get the answer I'm looking for. I understand that different materials have different emissivities and that food items have an emissivity around 0.95. But I'm not sure about the math. I'm debating between two different IR thermometers, one has a fixed emissivity of 0.95 and the other, which is labeled as a "Food Safety Thermometer" is fixed @ 0.97. So I'm wondering, if both of these thermometers were to measure the temp of the same item at the same time, what difference in temperature should I expect to see? Is it a matter of degrees or would it be a small fraction of a degree? And if I were to try to take the temperature of something with a much lower emissivity, like a stainless steel pan, how far off would that reading be? |
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zelig2
Joined: 19 Jul 2010 Posts: 1 Location: Ohio
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Posted: Mon Jul 19, 2010 9:54 pm Post subject: |
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The difference at 500 degrees between 0.95 and 0.97 is maybe a degree. If you measure a pan it can be nearly 50 degrees off. |
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sharksfan7
Joined: 19 Jul 2010 Posts: 2
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Posted: Tue Jul 20, 2010 6:35 pm Post subject: |
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Thanks for the response. Is it safe to assume that at lower temperatures the difference would be even smaller? I'll be using it primarily when working with chocolate and the temperatures would be more around 80-120 degrees F. |
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