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Session Topic: 6C, Temperature Session

   

Paper Title: Stability of Type K Thermocouples at 1000°C

   

Date & Time: WEDNESDAY, August 7, 2002

 

8:30 - 10:00am PARALLEL SESSIONS - SESSION 6

   

Speaker: S. G. Petkovic

Email: sgpetkovic@inmetro.gov.br

   

Type K thermocouples are more frequently used in Industry. They are usually calibrated in the range 0°C to 1100°C, with expanded uncertainty (k=2) of ± 1,0°C up to 1000°C. Sheathed thermocouples having compacted mineral oxide insulation and thermocouples in conventional closed-end protecting tubes were studied. We investigated the electromotive force stability of type K thermocouples calibrated in fixed point cells during 100 hours. The results, laboratory facilities, calibration method, and the annealing influence are discussed to evaluate uncertainties. The uncertainty budget reports that the most important factor in the expanded uncertainty is the drift of the electromotive force along time.

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