Gas sensor and detection system comprising such a sensor

Details Gas sensor and detection system comprising such a sensor Gas sensor and detection system comprising such a sensor

1984-10-04

1987-02-17

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

73 23, G08B 1710

Patent

active

046443339

ABSTRACT:
Gas sensor consisting of a housing which is divided into two compartments 3 and 4 by means of a fluid filter 2, e.g. a bed of activated charcoal. Compartment 3 has an inlet channel 5 and contains a first gas-sensitive semiconductor 6, the measuring device. Compartment 4 has an outlet channel 7 and contains a second gas sensitive semiconductor 8, being used as a reference device. The value of the electric resistances of devices 6 and 8 will increase or decrease when the compartments 3 and 4 contain either an oxidizing or a reducing gas. The sensor is used in a gas detection system in which an electronic circuit which follows determines the ratio between said resistances and the ratio of the reference device and a reference resistance. These ratios are subsequently compared to certain limiting values, and when these values are exceeded, a detection signal will be produced.

REFERENCES:
patent: 3801972 (1974-04-01), Ho Kim et al.
patent: 3815114 (1974-06-01), Johnson et al.
patent: 3851520 (1974-12-01), Schluter et al.
patent: 4250737 (1981-02-01), Biglin
patent: 4256985 (1981-03-01), Goodson et al.
patent: 4443791 (1984-04-01), Risgin et al.
patent: 4490715 (1984-12-01), Kusahagi et al.
The Radio and Electronic Engineer, vol. 44, No. 2, Feb. 1974, (London, Great Britain) Watson et al.; "Applications of the Taguchi Gas Sensor to Alarms for Inflammable Gases", pp. 85-91.

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