Gas detector

Details Gas detector Gas detector

1981-02-20

1982-08-17

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340693, 422 98, G08B 1710

Patent

active

043452426

ABSTRACT:
A gas detector (11) provides a comparator (22) having a plurality of inputs to provide a simplistic but yet reliable sensing sequence for detecting a contaminated gas such as carbon monoxide. A first input (55) is supplied from an enable circuit (41) which disables the comparator (22) for a predetermined period of time to prevent operation of an associated alarm (33) to permit a heater (14) of a gas sensor (12) to be initially energized to properly condition the associated gas sensing electrodes (13). A second input (16) is supplied from the gas sensor (12) to continually monitor the carbon monoxide concentration to provide an alarm (33) when sensing a high level of gas contamination. A third input (34) provides a latching circuit to continually activate the alarm (33) until the power input (15) is de-energized. A fourth input (27) provides a predetermined reference voltage to the comparator (22). A second comparator (35) senses a low or intermediate level of gas concentration to energize a second signal (39) and is likewise disabled by the enable circuit (41) for a predetermined time while the sensor (12) is being initially conditioned for operation.

REFERENCES:
patent: 3801972 (1974-04-01), Ho Kim et al.
patent: 3860919 (1975-01-01), Aker

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