COMPARISON OF THERMOCOUPLE TEMPERATURE SCALES REALIZED BY FIXED-POINT AND RADIATION METHODS

• Abstract:

  We have developed a blackbody block system for comparing thermocouple temperature scales realized using fixed-point and radiation methods. Platinum/palladium, type S and type B thermocouples were calibrated using the freezing points of Ag, Cu, Fe-C, Co-C, and Pd (only for Type B). The radiation thermometer used was an LP4 linear pyrometer operated at a central wavelength of 650 nm. Two scales were compared from 962 to 1544 °C, and it was found that the two scales were consistent within 0.5 °C up to 1400 °C, but the discrepancy increased to 2.0 °C at 1544 °C for the type B thermocouple. In terms of the measurement uncertainty, the thermometric and radiometric scales realized at KRISS were in agreement up to the freezing temperature of Pd.
• Keywords:

  thermocouple thermometry, radiation thermometry, fixed-point calibrations, eutectic temperature, scale comparison
• Download:

  IMEKO-WC-2009-TC12-181.pdf
• DOI:

  _unreg_wc-2009.181

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