RTD or thermocouple?

[Ron Schroeder]

At 02:34 PM 10/11/01 -0500, you wrote:
>On Wednesday 10 October 2001 02:15 pm, you wrote:
>> On Wed, 10 Oct 2001, Andrew Theurer wrote:
>> > datalogger for exhaust, but I don't know all the details yet.  A person
>> > who has it discovered quickly that the thermocouple he had (installed in
>> > addition to the RTD) reported temps poorly compared to the RTD.  The
>> > temps reported by the thermocouple were off (too cold) and lagged behind
>> > a few seconds.  I'll try to find out more info about it.
>>
>> Just a little question - how did he verify that the RTD was correct, and
>> not the thermocouple?
>
>He didn't.  That's the problem...

>From my experience, I would believe the TC over the RTD unless they are
both truely calibrated.  The TC output is primaraly dependant on the laws
of physics whereas the RTD is dependant on manufacturing tolerances.  An
RTD can be calibrated closer over a wide temperature range but initial
uncalibrated accuracy is not as good.

Ron Schroeder
WD8CDH
E. E. S.
wd8cdh at bnl.gov
rjs at bnl.gov
ron at 112motors.com
631 344-4561 Day
631 286-5677 Nite
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