Calibration of the spot welded TC cable thermocouples

[homoly]

Hello,

I would like to ask you what is your policy of calibrating TC cable based thermocouples. Is the initial calibration done by some third party certified body and the verifying is done internaly, all check are done by certified body or everything beginning with initial calibration is done internaly?

My next question would be what shall be the period of checking and what equipment do you use for internal verifying. Are there some relevant standards ( or literature ) that could provide a guide for this process for me?

Gabriel.

 

[Chinook82]

If I understand your question properly, my experience is that the manufacture specifies the accuracy of the thermocouple wire after manufacturing within their own plant. If they have a NIST traceable QA program their test gear will be certified to a traceable standard. The manufactured wire is then spot tested at different lengths to declare it's accuracy. Thermocouple wire is classed as standard, special limits, and thermocouple grade.

 

[xnuke]

Try the documents referenced at the bottom of this page:

http://ts.nist.gov/MeasurementServices/Calibrations/thermocouples.cfm

Also see ISA–MC96.1–1982 "Temperature Measurement Thermocouples".

xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
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[homoly]

Thank you for the response.

Gabriel.