Publication Date


Document Type


First Advisor

Ballantine, David Stephen

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Chemistry


Gas chromatography--Data processing; Vapors--Analysis--Data processing


When thermodynamic properties are studied, solute concentrations must be known accurately. In chemical sensor studies, vapor generators are commonly used. The output of these generators can be affected by the fluctuations in temperature of the box, the volume of the solvent in a bubbler, and pressure differences in the system. An automated vapor sampling analysis system was developed for real time verification of test vapor concentrations used in sensor studies generated by a VG-400 vapor system. A two position electronic actuator is automated via computer with an analog/digital 1-0 board and software written in Visual Basic to perform the sampling. The analysis is accomplished with a Varian 3400 CX gas chromatograph interfaced to the same computer via an analog/digital 1-0 board and software. This system was hooked in series between the vapor generator and the sensors being studied for near instantaneous quantitation of single and multi-component vapors. Comparisons are made between actual GC measured concentrations from the sampling system and the reported VG-400 dilution concentration.


Includes bibliographical references (pages [54]-55)


viii, 55 pages




Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type