Dual alarm gas detector

Details Dual alarm gas detector Dual alarm gas detector

1978-09-15

1980-08-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73 27R, 422 96, G08B 1710

Patent

active

042198062

ABSTRACT:
A detector of a significant gas condition in the atmosphere comprises one or more elements for sensing the condition, the elements being connected to an alarm channel which sounds a warning alarm or controls a corrective device such as a gas valve in the event of an excessive atmospheric condition. The detector includes a threshold sensing and alarm amplifying channel, and a trouble sensing electronic valve or stage responsive to failure of one of the sensing elements both to enable operation of a trouble channel to cause the alarm to indicate the failure and also to inhibit operation of the alarm channel. The trouble channel may also relay power supply failures such as a decrease in battery voltage.

REFERENCES:
patent: 3801972 (1974-04-01), Hokim et al.
patent: 3955186 (1976-05-01), Green et al.
patent: 3961400 (1976-06-01), Gintelia et al.
patent: 4007456 (1977-02-01), Paige et al.

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