Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-08-25
1980-03-04
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
340506, 340632, 12820222, 12820314, 12820325, G08B 2100
Patent
active
041919521
ABSTRACT:
In anesthesia apparatus for supplying oxygen and an anesthesia gas through respective flow control valves to a patient breathing circuit a low oxygen flow alarm system is provided. The alarm system includes a restrictor in the pipeline of the oxygen flow control valve and a restrictor in the pipeline of the anesthesia gas flow control valve. A differential pressure sensing unit including a diaphragm assembly responsive to the pressure in the oxygen pipeline and another diaphragm assembly responsive to the pressure in the anesthesia gas pipeline is coupled to the restrictor pipelines. The diaphragm assemblies are opposed to each other and coupled together by a displaceable linkage. Electrical switch means are provided coupled to the linkage to provide an alarm signal when the linkage has been moved to a predetermined position indicating that the oxygen concentration has dropped below a predetermined value. The differential pressure sensing unit includes spring biasing means.
REFERENCES:
patent: 3632924 (1972-01-01), Harper
patent: 4100537 (1978-07-01), Carlson
patent: 4148311 (1979-04-01), London et al.
Schreiber Joachim G. M.
Schreiber Peter J.
N.A.D. Inc.
Waring Alvin H.
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