Measuring and testing – Gas analysis – Gas chromatography
Patent
1987-06-29
1988-08-02
Chapman, John
Measuring and testing
Gas analysis
Gas chromatography
G01N 3032
Patent
active
047607327
ABSTRACT:
A flow programmer for gas chromatography of the type having a mass flow meter for controlling the flow rate of a gas chromatography carrier gas controllable at a selected carrier gas flow rate program by an electrical input to the mass flow meter and an electrical circuit for generating the electrical input. The improvement is that the electrical circuit for generating the electrical input is an analog electrical circuit which includes an operational amplifier having an electrical capacitor in the feedback loop of the operational amplifier to produce a selected voltage input program.
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patent: 4373549 (1983-02-01), Nalepa et al.
Lee, Milton L. et al., "Open Tubular Column Gas Chromatography, Theory and Practice," A Wiley-Interscience Publication, pp. 195-198 and 227.
Nygren, Soren et al., "Flow Programming in Glass Capillary Column-Electron Capture Gas Chromatography by Using the Valve in the Splitter Line," J. of Chromatography, 123, (1976), 101-102, 107-108.
Nygren, Soren, "Exponential Flow Programming in Gas Chromatography," J. of Chromatography, 142, (1977), 109-116.
Nohl, A., "Flow Programming of Short Capillary Columns," Chromatography Review, vol. 11, No. 3, (10/1984), 10-11.
DoDo, Gerald H., "Optimized Flow Programming for Temperature-Programmed Gas Chromatography," J. of Chromatography, 328, (1985), 49-53.
Nygren, Soren, "Applications of a Computerized Flow Programmer for Capillary Column Gas Chromatography," Anal. Chem., (1985), 57, 2748-2751.
"User's Manual for Porter Thermal Mass Flowmeter and Thermal Mass Flow Controller," Model: 201-SSVB, Ser. No.: 8603193, Porter Inst. Co., Inc.
Barr Stephen W.
Bredeweg Robert A.
Larson Jeffrey R.
Chapman John
Roskos Joseph W.
Stevens Timothy S.
The Dow Chemical Company
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