Measuring and testing – Gas analysis – Gas chromatography
Patent
1981-01-22
1983-04-12
Goldstein, Herbert
Measuring and testing
Gas analysis
Gas chromatography
422 52, 422 54, 422 98, G01N 3100
Patent
active
043794025
ABSTRACT:
An apparatus for compensating for changes in the mass flow rate of a sample gas stream in gas analysis instruments having outputs that are calibrated in terms of the concentration of a component of the sample stream. In instruments in which a pressure regulated sample gas stream is applied to a detector assembly through a flow restrictor such as a sample capillary, a gas flow sensor is connected in series with the flow restrictor to develop a correction signal that varies in accordance with the mass flow rate of the sample stream. A correcting circuit combines the correction signal from the flow sensor with the output signal from the detector assembly to produce a corrected output signal that correctly indicates the concentration of the component of interest.
REFERENCES:
patent: 3250469 (1966-05-01), Colston
patent: 3349619 (1967-10-01), Millar
patent: 3537296 (1970-11-01), Gamache
patent: 3760831 (1973-09-01), Coldin
patent: 4015473 (1977-04-01), Kleuters et al.
patent: 4118973 (1978-10-01), Tucker et al.
patent: 4190368 (1980-02-01), Etess
patent: 4257777 (1981-03-01), Dymond
Article entitled "Evaluation of the Measurement of Oxides of Nitrogen in Combustion Products by the Chemiluminescence Method", by J. D. Allen, Journal of the Institute of Fuel, vol. 47, p. 275, (1974).
Beckman Instruments Inc.
Goldstein Herbert
Harder P. R.
Jason Edward C.
Steinmeyer R. J.
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