Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-04-12
1984-04-03
Yasich, Daniel M.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73293, 12820013, 137392, 261 66, 340619, G01F 2302, G01N 2121
Patent
active
044410271
ABSTRACT:
A liquid level sensing device, particularly useful for apparatus designed to humidify oxygen gas being administered to patients undergoing respiratory therapy is disclosed. The liquid level sensing device detects the liquid level in a canister having an optical probe therein. A bracket, rotatable on a frame of the device, carries a light source and a light sensing member for determining liquid level in the canister in conjunction with the probe. The hinged bracket engaging relation, and it also rotates out of probe-engaging relation and registry with the light probe. When the bracket is out of registry with the light probe, the canister may be removed and replaced. The bracket may be releasably retained out of probe-engaging relation by means of a snap fit structure.
REFERENCES:
patent: 3163176 (1964-12-01), Darling
patent: 3644914 (1972-02-01), Veasaw et al.
patent: 4111198 (1978-09-01), Marx et al.
patent: 4137940 (1979-02-01), Faisandier
patent: 4193004 (1980-03-01), Lobell et al.
patent: 4303601 (1981-08-01), Grimm et al.
Cairo Joseph A.
Richardson Gerry D.
Baxter Travenol Laboratories Inc.
Caruso John A.
Dickinson Q. Todd
Flattery Paul C.
Yasich Daniel M.
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