Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1983-12-13
1985-09-17
Bernstein, Hiram H.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
73 27R, 324 65R, 422 98, G01N 2716
Patent
active
045419884
ABSTRACT:
A constant temperature catalytic gas detection instrument (10) has a gas sensor (14) whose operating temperature is maintained within a predetermined range by a novel control circuit. The gas sensor includes a reference element (16) and an active element (18) on which a metal oxide catalyst reacts with the combustible gas. First and second driver circuits (30 and 36) are provided for presenting operating voltages to the active element (18) and the reference element (16), respectively, of the gas sensor (14). The first driver (30) controls the power to the active element (18), to maintain its temperature within a predetermined operating range. The second driver (36) responds to changes in the power through the active element (18) with respect to the current through the active element (18), causing the current in the reference element (16) to track the current in the active element (18). An indicator (38) connected between the active element (18) and the reference element (16) senses a potential difference therebetween to provide an indication of the concentration of said unknown gas.
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Anouchi Abraham
Critchlow Richard
Tozier John E.
Bacharach Instrument Company
Bernstein Hiram H.
Gzybowski Michael S.
Hayter Robert P.
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