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A Sensitive Electronic Liquid Level Indicator for Condensed Gases

  • D. W. Braudaway
  • S. B. Schwartz
  • J. W. Allen
Conference paper
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 1)

Abstract

The difference between the dielectric constant of the liquid and gaseous phases of a substance can be and has been used1,2 to indicate the height of the liquid in a container. The change of capacitance of a vertical plate capacitor with level of liquid between the plates can conveniently be employed. The circuit given will indicate a very small change of capacitance and is ideal for this purpose. For a change of 30 micro-microfarads in about 450 the change of cathode current in the 6L6 is approximately 2.5 milliamperes.

Keywords

Dielectric Constant Cathode Current Volt Peak Point Breakdown Liquid Hydrogen 
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.

References

  1. 1.
    S. C. Coroniti, Electronic Liquid Level Indicator, Rev, Sci. Instr. 13, 484 (1952). Coroniti applied a device similar to the one described to both electrolytic and non-electrolytic liquids at normal temperatures.Google Scholar
  2. 2.
    W. E. Williams, Jr. and E. Maxwell, Liquid Level Indicator for Condensed Gases at Low Temperatures, Rev. Sci. Instr. 25, 111 (1954).CrossRefGoogle Scholar

Copyright information

© Plenum Press, Inc., New York 1960

Authors and Affiliations

  • D. W. Braudaway
    • 1
  • S. B. Schwartz
    • 1
  • J. W. Allen
    • 1
  1. 1.CEL National Bureau of StandardsBoulderUSA

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