Cryogenic Thermometer Calibration Facility at CERN

  • C. Balle
  • J. Casas
  • J. P. Thermeau
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


A cryogenic thermometer calibration facility has been designed and is being commissioned in preparation for the very stringent requirements on the temperature control of the LHC superconducting magnets. The temperature is traceable in the 1.5 to 30 K range to standards maintained in a national metrological laboratory by using a set of Rhodium-Iron temperature sensors of metrological quality. The calibration facility is designed for calibrating simultaneously 60 industrial cryogenic thermometers in the 1.5 K to 300 K temperature range, a thermometer being a device that includes both a temperature sensor and the wires heat-intercept. The thermometers can be calibrated in good and degraded vacuum or immersed in the surrounding fluid and at different Joule self-heating conditions that match those imposed by signal conditioners used in large cryogenic machinery. The calibration facility can be operated in an automatic mode and all the control and safety routines are handled by a Programmable Logic Controller (PLC). Lab VIEW® is used both as the PLC operator interface and for configuring and reading the thermometric data sampled by the higher accuracy laboratory equipment. The isothermal support onto which the thermometers are mounted is thermally anchored through the wiring to a helium bath. The calibration procedure begins once the temperature of the support is stabilized. Measured data is presented and it is possible to infer that the absolute accuracy that can be obtained is better than ± 5 mK for the full temperature range.


Programmable Logic Controller Butterfly Valve Calibration Facility Cryogenic Engineer Full Temperature Range 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    L. R. Evans, The Large Hadron Collider Project, in: “proceedings of CEC 16-ICMC”, Kitakyushu — Japan (1996), p. 45Google Scholar
  2. 2.
    V. Benda et al., Conceptual design of the cryogenic system for the Large Hadron Collider (LHC), EPAC-96, (1996), P. 361Google Scholar
  3. 3.
    C. Balle and J. Casas, Industrial-type cryogenic thermometer with built-in heat interception, in: “Advances in Cryogenic Engineering”, Vol. 41 B, Plenum, NY (1996), p. 1715CrossRefGoogle Scholar
  4. 4.
    F. Pavese, V.M. Malyshev, P.P.M. Steur , D. Ferri and D. Giraudi, Routine calibration of cryogenic thermometers in the range 1.5–300K with an accuracy up to the milliKelvin level, and measurement of fixed points in sealed cells with a fully automated and self-contained modular apparatus, in: “Advances in Cryogenic Engineering”, Vol. 41 B, Plenum, NY (1996), p. 1683CrossRefGoogle Scholar
  5. 5.
    V.L. Datskov and J.G. Weisend II, Characteristics of Russian carbon resistance (TVO) cryogenic thermometers, Cryogenics, Vol 34 (1994), p. 425CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • C. Balle
    • 1
  • J. Casas
    • 1
  • J. P. Thermeau
    • 2
  1. 1.CERN-division ATGeneva 23Switzerland
  2. 2.IPN (CNRS-IN2P3)Orsay CedexFrance

Personalised recommendations