Air detecting device for steam or gas sterilizers

Details Air detecting device for steam or gas sterilizers Air detecting device for steam or gas sterilizers

1977-04-06

1978-09-19

Wolk, Morris O.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

73356, 116114V, 422 59, 422 87, 422295, A61L 302, G01N 2500, G01N 3122

Patent

active

041150686

ABSTRACT:
Air indicating device for use in steam or gas sterilizers and the like includes an upright tube placed in the sterilizer. The tube is open at its bottom to the sterilizing chamber and is closed at its top. A heat sink within the tube causes steam entering the tube to condense with a resulting accumulation of air in the top of the tube. The air accumulation acts as a barrier preventing further steam from reaching the upper portion of the tube. A temperature sensitive indicator strip extending axially into the tube changes color responsive to temperature. The air barrier is also an insulator so that the color of the indicator is a record of the temperature gradient from the top to the bottom of the tube, the temperature, in turn, being a measure of the amount of air trapped in the tube.

REFERENCES:
patent: 2826073 (1958-03-01), Huyck et al.
patent: 3402991 (1968-09-01), Hanfrey
patent: 3450489 (1969-06-01), Fay
patent: 3479131 (1969-11-01), Scoffield et al.
patent: 3667916 (1972-06-01), Sliva et al.
patent: 3696675 (1972-10-01), Gilmour
patent: 3769932 (1973-11-01), Romito et al.
patent: 3967494 (1976-07-01), Joslyn

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