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Automatic Refilling System For Liquid HeliumCryogenic experiments left unattended for days. System automatically replenishes liquid helium in cryogenic experimental apparatus as liquid evaporates. Automatic filling system transfers liquid helium from storage vessel to experimental apparatus under computer control. Gaseous helium from cylinder supplies pumping pressure. Circuit senses level of liquid helium by sensing voltage across measuring resistors in series with silicon resistance thermometers (SRT's). Low voltage indicates SRT covered, while high voltage indicates uncovered.
Document ID
19900000332
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Serlemitsos, Aristides (NASA Goddard Space Flight Center, Greenbelt, MD.)
Sansebastian, Mark (NASA Goddard Space Flight Center, Greenbelt, MD.)
Geagen, Jay (NASA Goddard Space Flight Center, Greenbelt, MD.)
Warner, Brent (NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 7
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
GSC-13270
Accession Number
90B10332
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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