Gas sensor

Details Gas sensor Gas sensor

1980-11-06

1982-04-27

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

422 98, G08B 1710

Patent

active

043273610

ABSTRACT:
A variable resistance gas sensor controls the output frequency of a varia frequency tone generator. A tone decoder monitors the output frequency of the tone generator. When the gas concentration attains a predetermined threshold value, the tone decoder produces an output signal which activates a latch circuit to energize an alarm device. The latch circuit continues to energize the alarm device even after the gas concentration is reduced below the threshold value until manually reset.

REFERENCES:
patent: 3686655 (1972-08-01), Kasahara
patent: 3860919 (1975-01-01), Aker
patent: 3950739 (1976-04-01), Campman
patent: 4104619 (1978-08-01), Hesler
patent: 4109240 (1978-08-01), Scheidweiler
patent: 4185491 (1980-01-01), Owen

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