NASA NTRS · 19900000332
Automatic Refilling System For Liquid Helium
Abstract
Cryogenic 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.
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Serlemitsos, Aristides, Sansebastian, Mark, Geagen, Jay, Warner, Brent. 1990-07-01. Automatic Refilling System For Liquid Helium. https://ntrs.nasa.gov/citations/19900000332
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