Real-Time Computer Control of A Gas Chromatograph

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Abstract
A small dedicated computer has been employed with a GC to provide optimized experimental conditions and measurements. The computer interacts with the experiment in real-time to control the sampling system and to measure and control the carrier gas flow rate and the column oven temperature. Both the hardware system which was developed for this work and the related software are described. Simple solid state logic control systems are used to control a pneumatically driven sampling system, as well as motors which are used to position a proportional temperature controller and a differential flow controller. The real-time interaction of the software allows the optimization of the carrier gas flowrate and the column oven temperature. An automatic “van Deemter” experiment as a function of temperature is described which utilizes the advantages of digital control for studies of basic separation processes in GSC.

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