Liquid detection circuit

Details Liquid detection circuit Liquid detection circuit

1986-04-01

1987-11-17

Frankfort, Charles

Measuring and testing

Liquid level or depth gauge

Thermal type

340622, 361178, 62 49, G01F 2324

Patent

active

047064978

ABSTRACT:
Herein is a circuit which is capable of detecting the presence of liquids, especially cryogenic liquids, and whose sensor will not overheat in a vacuum. The circuit parameters, however, can be adjusted to work with any liquid over a wide range of temperatures.

REFERENCES:
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patent: 3876037 (1975-04-01), Rath, Jr.
patent: 3943767 (1976-03-01), Efferson
patent: 4103319 (1978-07-01), Crain et al.
patent: 4163391 (1979-08-01), Beard et al.
patent: 4319233 (1982-03-01), Matsuoka et al.
patent: 4326199 (1982-04-01), Tarpley et al.
patent: 4404809 (1983-09-01), Johnson et al.
patent: 4550261 (1985-10-01), Hormel et al.
patent: 4600844 (1986-07-01), Atkins
Vanderkooy J. et al, "Semiautomatic Liquid Helium Transfer Control," Rev. Sci. Instrum., 49(12) Dec. 1978, pp. 1746-1747.
Pal. A. K. et al, "A Liquid Nitrogen Two Level Controller of New Design Cryogenics, vol. 20, No. 2, Feb. 1980, pp. 108-109.

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