Operation of Liquid Helium Level Sensors at Elevated Pressures

  • A. F. Zeller
  • H. Laumer
  • J. A. Nolen
Part of the A Cryogenic Engineering Conference Publication book series (ACRE, volume 33)

Abstract

Operation of standard liquid helium level sensors depends on the difference in heat transfer between the gas and liquid phases. At increased pressure inadequate cooling by the liquid causes the resistive zone to penetrate below the liquid surface when the liquid level rises. Thus the level detector records the minimum level and does not follow any subsequent rise in the level. Measurements of indicated levels as a function of heater current at pressures up to 0.2 MPa (29 psia) were made using an American Magnetics sensor to determine the proper heater currents. Reduced heater currents were found to permit operation at pressures up to nearly the critical point.

Keywords

Helium 

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References

  1. 1.
    K.R. Efferson, A superconducting (Nb-Ti) liquid helium level detector, in: “Advances in Cryogenic Engineering”, Vol. 15, Plenum Press, New York (1969), p. 124.Google Scholar
  2. 2.
    P.W. Eckeis et al, Superconducting generator cooling system simulation, Cryogenics 25: 471 (1985).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • A. F. Zeller
    • 1
  • H. Laumer
    • 1
  • J. A. Nolen
    • 1
  1. 1.National Superconducting Cyclotron LabMichigan State UniversityEast LansingUSA

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