Patent ID: 8974580
Filing Date: 2015-03-10
Classification: B01D,G01N

Abstract:
1. An improved loop modulator system for a comprehensive two-dimensional gas chromatograph, wherein the loop modulator system includes a cold gas jet assembly having a cold jet nozzle, a hot jet assembly having a hot jet nozzle, and a looped column of a modulator tube, wherein the cold gas jet assembly directs a flow of cold gas from the cold jet nozzle towards the looped column, wherein the hot jet assembly directs a flow of hot gas from the hot jet nozzle towards the looped column, the improvement comprising: a collimator connected to the cold gas jet assembly for modifying the flow of cold gas from the cold jet nozzle to produce a modified flow of cold gas, wherein said collimator has at an opening at one end for securing the collimator to the cold gas jet assembly and an opening at an opposite end for modifying the flow of cold gas from the cold jet nozzle, wherein the looped column intersects the modified flow of cold gas, wherein the opening for modifying the flow of cold gas from the cold jet nozzle is oriented such that the modified flow of cold gas has a reduced cross-sectional area intersecting the looped column of the modulator tube.