 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
nuckolls.bob(at)aeroelect
Guest
|
 Posted: Mon Oct 01, 2012 11:54 am Post subject: Thermocouple testing |
 |
|
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 . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
| Description: |
|
| Filesize: |
310.48 KB |
| Viewed: |
2941 Time(s) |
|
|
|
| Back to top |
|
 |
mrspudandcompany(at)veriz
Guest
|
| Posted: Mon Oct 01, 2012 1:50 pm Post subject: Thermocouple testing |
|
|
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]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
