Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1996-07-23
1999-06-01
Eisenschenk, Frank C.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
324 715, 73 2334, G01N 2704, G01N 2700, G01N 700
Patent
active
059086009
ABSTRACT:
An improved area monitor for detecting gas concentration is provided that requires a very infrequent calibration, and works reliably in detecting a particular target gas using only two semiconductor sensors. One of these sensors will exhibit a drift that is constantly monitored and automatically compensated for, while the other sensor exhibits a stable, repeatable response over very long periods of time. Once the "stable" has been initially calibrated, the concentration of the target gas can be discerned directly from the resistance of this sensor, although more that one particular chemical gas may cause the stable sensor to change resistance. The second sensor is then used to discern whether or not the change in resistance of the stable sensor was due to the actual target chemical, or due to some other similar chemical. The second sensor is selected to be of a type that responds in one direction (i.e., its change in resistance either increases or decreases) when emersed in the particular target chemical of interest. For all other similar gases, the resistance of the second sensor will change in the opposite direction.
REFERENCES:
patent: 3961248 (1976-06-01), Kawamura
patent: 4457161 (1984-07-01), Iwanaga et al.
patent: 4542640 (1985-09-01), Clifford
patent: 4638443 (1987-01-01), Kaneyasu et al.
patent: 4644333 (1987-02-01), Barendsz et al.
patent: 4818348 (1989-04-01), Stetter
patent: 5177994 (1993-01-01), Moriizumi et al.
patent: 5223783 (1993-06-01), Wilis
patent: 5321146 (1994-06-01), Royster et al.
PCT/US97/12740 International Search Report, Nov. 5, 1997.
Patent Abstracts of Japan, JP 03 211415, European Patent Office, Sep. 17, 1991.
Murthy Ashok
Simi Victor M.
APL Group International, LLC
Davidson James P.
Eisenschenk Frank C.
Gribbell Frederick H.
Park Hankyel T.
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