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nuckolls.bob(at)aeroelect
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 Posted: Mon Oct 01, 2012 11:54 am Post subject: Thermocouple testing |
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A few weeks ago we had some discussion about troubleshooting
a thermocouple temperature indicator system. I was curious
about current offerings on eBay and elsewhere for K-type
thermocouple readout devices useful as test tools. I ordered
these two items for further study.
A TM902C hand-held readout instrument powered by
internal battery
http://tinyurl.com/9v8w6d2
and a panel mounted 12vdc externally powered
device
http://tinyurl.com/8c3ngdq
The second one was a disappointment. I was initially
encouraged when I saw a diode mounted between two
terminals on the back of the instrument adjacent to
locations for the thermocouple wire . . . this was
no doubt part of the cold-junction compensation.
The critter was pretty close at 0C but off by 5-6 degrees
at 100C. I opened it up and didn't find any calibration
provisions.
The TM902 was a pleasant surprise. Not only was it within
one degree at 0C (stirred ice bath) it was equally close
at 100C (boiling distilled water). Even better yet, a peek
inside revealed not only an active cold-junction correction
device but two calibration pots.
[img]cid:.0[/img]
Bottom line is that this particular instrument is a great value as
a test tool for in-flight temperature surveys, it's easily re-calibrated
should this be necessary in the future.
It comes with a K-type thermocouple about 3' long. Uses standard T/C
connectors. The K-type wire is readily available from sources like eBay
and Omega. The low cost and re-calibration convenience of this critter
puts good temperature measurement and test capability in everybody's
hands.
Bob . . .
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mrspudandcompany(at)veriz
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| Posted: Mon Oct 01, 2012 1:50 pm Post subject: Thermocouple testing |
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A TM902C hand-held readout instrument powered by
internal battery
http://tinyurl.com/9v8w6d2
Bob,
Thanks for the tip. I have one on order.
Roger
[quote][b]
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