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Re: Infrared thermometer [message #224723 is a reply to message #224685] |
Sun, 06 October 2013 17:16 |
George Beckman
Messages: 1085 Registered: October 2008 Location: Colfax, CA
Karma: 11
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Thanks. My little tiny unit quit shutting off and the battery suffers for it. Maybe I will not loose this one.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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Re: [GMCnet] Infrared thermometer [message #224736 is a reply to message #224697] |
Sun, 06 October 2013 21:18 |
Jim Miller
Messages: 501 Registered: March 2008
Karma: 10
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Senior Member |
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On Oct 6, 2013, at 12:47 PM, John Wright wrote:
> I guess it depends if you want to check header temps or not.
Do they read accurately if pointed at reflective, polished, or semi-gloss surfaces like an exhaust header? My personal experience with IR imagery is that you need to be looking at a blackbody in order to get the most accurate readings. This became obvious to me when I once used an IR imager to look at the stainless backsplash of a drinking fountain - instead of seeing a dull piece of metal at ambient temperatures I instead saw a reflection of my face and body that with an indicated temperature of 98F.
One time years ago I used an IR thermometer to spot-check temperatures of copper piping; I found that if I wrapped a piece of black electrical tape around the pipe and then pointed at the tape that I would get very accurate readings. If I pointed at bare copper then the readings would be nonsense.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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