Warning device to indicate the state of gases exhaustion of a ga

Details Warning device to indicate the state of gases exhaustion of a ga Warning device to indicate the state of gases exhaustion of a ga

1989-03-10

1989-10-17

Cohan, Alan

Surgery

Respiratory method or device

Means for indicating improper condition of apparatus

12820415, 12820527, 12820612, 12820712, A62B 710

Patent

active

048739707

ABSTRACT:
A warning device comprised of an electrochemical cell which detects the concentration of toxic gas that is passing through a housing holding the cell to a face mask. The cell produces a signal corresponding to the concentration level of toxic gas present. The signal is received by a threshold switch which is set to produce a signal only when a signal from the cell equals or exceeds a predetermined level. The signal from the threshold switch activates a visual signal means and acoustical signal means to indicate that a gas filter, connected to the warning device, is exhausted.

REFERENCES:
patent: 1320935 (1919-11-01), Schwartz
patent: 3902485 (1975-09-01), Wallace

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