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Title: Self-calibration of a W/Re thermocouple using a miniature Ru-C (1954 °C) eutectic cell

Previous successful investigations of miniature cobalt-carbon (Co-C, 1324 °C) and palladium-carbon (Pd-C, 1492 °C) high temperature fixed-point cells for thermocouple self-calibration have been reported [1-2]. In the present work, we describe a series of measurements of a miniature ruthenium-carbon (Ru-C) eutectic cell (melting point 1954 °C) to evaluate the repeatability and stability of a W/Re thermocouple (type C) by means of in-situ calibration. A miniature Ru-C eutectic fixed-point cell with outside diameter 14 mm and length 30 mm was fabricated to be used as a self-calibrating device. The performance of the miniature Ru-C cell and the type C thermocouple is presented, including characterization of the stability, repeatability, thermal environment influence, ITS-90 temperature realization and measurement uncertainty.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ;  [4]
  1. National Physical Laboratory (NPL), Hampton Road, Teddington, Middlesex (United Kingdom)
  2. (United Kingdom)
  3. (Thailand)
  4. University of Surrey, Guildford, Surrey (United Kingdom)
Publication Date:
OSTI Identifier:
22218027
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1552; Journal Issue: 1; Conference: 9. international temperature symposium, Los Angeles, CA (United States), 19-23 Mar 2012; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CALIBRATION; CARBON; COBALT; EUTECTICS; INTERMETALLIC COMPOUNDS; MELTING POINTS; PALLADIUM; PERFORMANCE; RUTHENIUM; STABILITY; TEMPERATURE MEASUREMENT; THERMOCOUPLES