Method and apparatus for reducing false alarms in gas warning in

Details Method and apparatus for reducing false alarms in gas warning in Method and apparatus for reducing false alarms in gas warning in

1982-09-07

1984-05-08

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

340634, G01N 2714

Patent

active

044467184

ABSTRACT:
A metal-oxide semiconductor, which is heated to different temperatures, is used in conjunction with an electronic circuit for reducing false alarms caused by spurious gases in gas warning installations and for determining the composition of a gas mixture. The temperature of the metal-oxide semiconductor, after reaching a predetermined value (T), is altered by an amount (.DELTA.T) either towards the positive or negative side or towards both the positive and negative side, respectively. The thus caused change in the conductivity of the metal-oxide semiconductor is evaluated in a comparator and in circuits for the different peak values of the gas components.

REFERENCES:
patent: 3906473 (1975-09-01), Le Vine
patent: 4012692 (1977-03-01), Eicker
patent: 4185491 (1980-01-01), Owen

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