Method and apparatus for monitoring the level of liquid nitrogen

Details Method and apparatus for monitoring the level of liquid nitrogen Method and apparatus for monitoring the level of liquid nitrogen

1997-09-29

1998-12-01

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

With measuring

73295, 137392, F17C 1302

Patent

active

058423478

ABSTRACT:
A monitoring apparatus is provided for use in cryogenic storage tanks. The monitoring apparatus is a combination cap and monitoring system. The monitoring system includes a sensor which is submerged in liquid nitrogen, a circuit for detecting changes in resistance of the sensor should the liquid nitrogen level fall to or below a selected level, and an audio output device which generates an audible alarm if the liquid nitrogen falls to or below the selected level.

REFERENCES:
patent: 5393736 (1995-02-01), Hodge et al.
patent: 5417072 (1995-05-01), Silver et al.
patent: 5488831 (1996-02-01), Griswold
patent: 5616838 (1997-04-01), Preston et al.
patent: 5671603 (1997-09-01), McCorkle et al.

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