NASA NTRS · 19830000009
Level Sensor for Cryogenic Fluids
Abstract
Hot wire sensor combined with voltage-comparator circuit monitors liquid level in cryogenic-fluid storage tanks. Sensor circuit adaptable to different liquids and sensors. Constant-current source drives current through sensing probe and fixed resistor. Voltage comparator circuits interpret voltage drops to tell whether probe is immersed in liquid and is current in probe.
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Simmons, N. E., Schroff, R. A.. 1983-08-01. Level Sensor for Cryogenic Fluids. https://ntrs.nasa.gov/citations/19830000009
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