Method and apparatus for reducing false alarms in gas...

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

G - Physics

01

N

340/143, 73/69

G01N 27/12 (2006.01) G01N 33/00 (2006.01)

Patent

CA 1189351

INVENTORS: STANISLAW BUKOWIECKI and KARLHEINZ PAGLOTKE INVENTION: METHOD AND APPARATUS FOR REDUCING FALSE ALARMS IN GAS WARNING INSTALLATIONS CAUSED BY SPURIOUS GASES ABSTRACT OF THE DISCLOSURE A metal-oxide semiconductor, which is heated to different temperatures, is used in conjunction with an elec- tronic 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.

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