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schmadel
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Iron
Re: FLIR Camera to identify hot spots
schmadel   8/13/2012 1:35:15 PM
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Hi Rob,

Sorry to take so long to get back to you.

I cant' be of much help as I've never used any of these systems to discover overheated connections. The systems, like those provided by Omega, boast an accracy of about 1 degree C. This should be fine for line-of-sight instances. But for connections inside panels something like the glass covers mentioned by lynnbr2 might work.

Incidentally, the link to ElectroPhysics didn't mention anything about glass covers.

-Don

Rob Spiegel
User Rank
Blogger
Re: FLIR Camera to identify hot spots
Rob Spiegel   8/9/2012 12:32:33 PM
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Those prices seem reasonable, Schmadel. How about accuracy. Do they catch most of the problems -- or potential problems?

lynnbr2
User Rank
Iron
Re: FLIR Camera to identify hot spots
lynnbr2   8/9/2012 12:31:24 PM
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an e-book on IR Viewports which includes basic design and application information is available at: http://www.iriss.com/Ten_things_about_Infrared-Windows_enquiry_form.php  

schmadel
User Rank
Iron
Re: FLIR Camera to identify hot spots
schmadel   8/9/2012 12:20:56 PM
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Sorry, I mean to type "Rob" not "Bob".

-Don

schmadel
User Rank
Iron
Re: FLIR Camera to identify hot spots
schmadel   8/9/2012 12:19:39 PM
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Hi Bob,

Here's a link to some optical thermometers.

http://www.allqa.com/IRcompare.htm

Some use IR lasers for the emissivity calibration, some use additional sighting lasers in the visible, and some have no lasers.

I also recal seeing our HVAC people using some with red sighting lasers to check hydronic heating systems.

These things seem to range in the $50 to $500 range.

-Don

Rob Spiegel
User Rank
Blogger
Re: FLIR Camera to identify hot spots
Rob Spiegel   8/9/2012 11:30:28 AM
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Interesting, Schmadel. So these use both laser and a thermal sensor and they're still not expensive.

schmadel
User Rank
Iron
Re: FLIR Camera to identify hot spots
schmadel   8/9/2012 10:53:54 AM
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The thermal system explained by lynnbr2 is a good approach. There are inexpensive point and click systems that use a laser beam to determine the emissivity at a particular wavelength, and then a thermal sensor to measure the emission near that wavelength. These hand held systems are sold for consumers for use in kitchens for measuring the temperature of a pot, or a roast, or a pot roast...  But when using a thermal approach one must have the circuit under significant power.

Jack Rupert, PE
User Rank
Platinum
Re: FLIR Camera to identify hot spots
Jack Rupert, PE   8/9/2012 10:21:46 AM
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Great idea @lynnbr2.  Anything that makes safety reviews and maintenance easier increases the likelihood that it will be performed.  I like the idea of IR friendly glass which not only makes the checks easier, in many cases it means the checks do not require a process shutdown.

Rob Spiegel
User Rank
Blogger
Re: FLIR Camera to identify hot spots
Rob Spiegel   8/8/2012 1:31:39 PM
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Thanks for the info, Lynnbr2. This is very helpful. What a great system. What what you suggest, it sounds expensive.

lynnbr2
User Rank
Iron
Re: FLIR Camera to identify hot spots
lynnbr2   8/8/2012 12:13:11 PM
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There is now IR-friendly glass that can be added to any cabinet to create a viewport so that the internal circuitry can be imaged by the thermal camera without opening the cabinet.

This is especially handy on Motor Control Centers that employ and interlock on the door. However, because of the increased engineering req'd and subsequent addt'l BoM cost, they are not common.

A whitepaper on this topic can be found at: http://www.electrophysics.com/nl/th0708/ 

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