Liquid nitrogen level controller

Details Liquid nitrogen level controller Liquid nitrogen level controller

1977-08-11

1979-01-23

Schwadron, Martin P.

Fluid handling

Liquid level responsive or maintaining systems

Electrical characteristic sensing

7304R, 62 49, 340618, 222 64, F16K 2118, F17C 1302, G01F 2324

Patent

active

041355482

ABSTRACT:
The liquid nitrogen level in a flask is controlled by the degree of immersion of two sensing coils of copper wire in the liquid nitrogen activating a solid state switching circuit which controls a liquid nitrogen inlet flow valve. Manual override and sensor fault indication is provided.

REFERENCES:
patent: 3291149 (1966-12-01), Atkins et al.
patent: 3509825 (1970-05-01), Sorenson
patent: 3545482 (1970-12-01), Paull
patent: 3741683 (1973-06-01), McTamaney et al.
patent: 3757317 (1973-09-01), Kahn et al.
patent: 4059424 (1977-11-01), Bentz
Electronic Circuit Manual, McGraw Hill, 1971.
Guidebook of Electronic Circuits, McGraw Hill, 1974.

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