Gas detector system

Details Gas detector system Gas detector system

1989-02-15

1991-10-22

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

250429, 250432R, 250435, 250504R, 324464, 324466, 356 51, 356437, 356438, 422 98, 436133, 436149, G01N 2101

Patent

active

050593978

ABSTRACT:
A gas detector system for detecting gases such as CO.sub.2. Sample air is passed through a critically sized sealed sample chamber in a sample cell. Infrared waves are generated in an insulated heater assembly, and radiate through windows of the sealed sample chamber concurrent with the sample air. The strength and magnitude of the infrared waves is attenuated by the level of gas, such as CO.sub.2, present in the sample air passing through the critically sized sealed sample chamber, and is sensed by a thermopile detector, including a filter for a specific frequency of infrared energy. Electronic circuitry processes the thermopile signal and measures other parameters of the gas detector to provide a signal indicative of the percentage of gas concentration in the air. Extensive use of insulation about and around the thermopile detector electronic circuitry and other components of the detector maximize stability and reliability.

REFERENCES:
patent: 3753656 (1973-08-01), Matson et al.
patent: 3765842 (1973-10-01), Purt
patent: 3840341 (1974-10-01), Rogers
patent: 3854876 (1974-12-01), Rankine et al.
patent: 4277438 (1981-07-01), Ejzak

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