Patent ID: 7623946
Filing Date: 2009-11-24
Classification: G01N

Abstract:
1. In a comprehensive two-dimensional gas chromatograph system having the elements a primary gas chromatography column, a secondary gas chromatography column that receives effluent from the primary gas chromatography column, an autosampler for injecting sample into the primary gas chromatography column, a detector for receiving effluent from the secondary chromatography column for data acquisition, a pulse generator, and a modulator having a pulse sequence for pulsing the effluent of the primary gas chromatography column to the secondary gas chromatography column, the improvement which comprises: instrument control and data acquisition software that starts the autosampler of the comprehensive two-dimensional gas chromatograph and the data acquisition by the detector and directs the autosampler to inject sample and send out a triggering signal to the pulse generator to reset the pulse sequence of the modulator thereby synchronizing the pulsing of the modulator, the start of the autosampler and data acquisition of the detector resulting in reproducible chromatograms with the same sample.