Gas detection apparatus

Details Gas detection apparatus Gas detection apparatus

1979-01-17

1980-11-25

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

123440, G01N 2712

Patent

active

042350964

ABSTRACT:
A gas detection apparatus with a gas detection element of which the electric resistance changes in accordance with a gas constituent, especially oxygen, in exhaust gas, wherein a fixed voltage is applied to a series circuit of the gas detection element and the reference resistor, and from the voltge at the voltage dividing point between the gas detection element and the reference resistor it is detected whether the gas constituent has exceeded a predetermined range or not. The gas detection apparatus includes a plurality of comparators each for comparing the voltage at the voltage dividing point with a corresponding one of the reference voltages to generate a comparison signal, and a logic circuit responsive to the rise or fall of the comparison signals showing that the gas constituent has exceeded a predetermined range.

REFERENCES:
patent: 3959765 (1976-05-01), Stewart
patent: 4147513 (1979-04-01), Bienkowski et al.

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