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Title: Process Gas Chromatography
Author: P. D. Martin
Source: 1978 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1978
Abstract: Many outstanding developments have been made to improve the flexibility, maintainability and data handling ability of process gas chromatographs (GCs). The most recent development, an enhancement of the solid-state programmer, employs the microprocessor to control various operations and to handle the resultant data. The microprocessor improves reliability, adds flexibility to programming and simplifies peak calibration. Other chromatographic components such as sample valves, detectors, columns, and readouts have also been improved. The manufacturers covered are listed in Table I. Figure I shows the basic parts of a process gas chromatograph (GC). The sample valve, a critical process GC component, is the interface between the sample system and the analyzer. A gas sample valve transfers a measured volume of a sample in gaseous form into carrier gas which flows through the GC. The number of molecules transferred, or injected, must be reproducible. This operation must be repeated many times a day, seven days a week. A liquid saimple valve delivers a metered volume of a sample in liquid form to a vaporizer.

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