Warning device to indicate the state of gases exhaustion of a gas filter retaining dangerous gases
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United States of America Patent
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Oct 17, 1989
Issued Date -
N/A
app pub date -
Mar 10, 1989
filing date -
Apr 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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