Increasing the profitability of industrial processes is strongly driven by minimizing quality compromise, avoiding off-spec product and reprocessing. When multiple products are manufactured, the ability to increase production of the high margin products, while reducing production of lower margin products significantly enhances the bottom line. These scenarios are always present in oil refineries. Accurate and faster measurements enable the tight control needed to optimize and maintain profits. The performance and reliability of the fast simulated distillation process gas chromatograph (PGC) has several desirable features making it ideal for a variety of process control applications.