Method, sensor and device for detecting trace quantities of gase

Details Method, sensor and device for detecting trace quantities of gase Method, sensor and device for detecting trace quantities of gase

1982-09-29

1984-12-04

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

73 27R, 422 98, 338 34, G01N 2700

Patent

active

044856679

ABSTRACT:
An enclosure (17) contains two ovens (18, 19) each containing a semiconductor metal oxide (SnO.sub.2 or NiO) sensor (13) previously activated using H.sub.2 S or SO.sub.2. The sensors (13) are heated to different temperatures the lower of which corresponds to a peak on the sensor conductivity curve characteristic of the gas. The signals produced are applied to a comparator (30). For many toxic gases this peak occurs at concentrations below their toxicity threshold in air.

REFERENCES:
patent: 3999947 (1976-12-01), Mihara et al.
patent: 4169369 (1979-10-01), Chang
patent: 4250737 (1981-02-01), Biglin

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