Reliability of High-Temperature Fixed-Point Installations over 8 Years

  • C. J. ElliottEmail author
  • T. Ford
  • O. Ongrai
  • J. V. Pearce
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science


At NPL, high-temperature metal-carbon eutectic fixed points have been set up for thermocouple calibration purposes since 2006, for realising reference temperatures above the highest point specified in the International Temperature Scale of 1990 for contact thermometer calibrations. Additionally, cells of the same design have been provided by NPL to other national measurement institutes (NMIs) and calibration laboratories over this period, creating traceable and ISO 17025 accredited facilities around the world for calibrating noble metal thermocouples at \(1324~{^{\circ }}\)C (Co–C) and \(1492~{^{\circ }}\)C (Pd–C). This paper shows collections of thermocouple calibration results obtained during use of the high-temperature fixed-point cells at NPL and, as further examples, the use of cells installed at CCPI Europe (UK) and NIMT (Thailand). The lifetime of the cells can now be shown to be in excess of 7 years, whether used on a weekly or monthly basis, and whether used in an NMI or industrial calibration laboratory.


Calibration Eutectic fixed-point cells High-temperature fixed points Lifetime Thermocouple 


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.National Physical Laboratory (NPL)TeddingtonUK
  2. 2.CCPI Europe LtdSheffieldUK
  3. 3.National Institute of Metrology for Thailand (NIMT)PathumthaniThailand

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