Leco Corporation

David Jesse Borton

Mark Firmer Merrick

Jonelle Ley Shiel

An analytical instrument assembly includes a gas chromatograph, a first detector, a second detector, and a pneumatic control module. The gas chromatograph includes a flow splitter configured to receive a sample. The first detector is coupled to the flow splitter. The second detector is coupled to the flow splitter. The pneumatic control module is coupled to the flow splitter and configured to deliver a carrier gas to the flow splitter. The flow splitter is configured to split the sample and deliver at least a first portion of the sample to the first detector and at least a second portion of the sample to the second detector at a first split ratio. The pneumatic control module is configured to deliver one of (i) a makeup flow including a third portion of the carrier gas to the flow splitter or (ii) an exhaust flow out of the flow splitter, wherein the pneumatic control module is configured to regulate the pressure within the flow splitter to thereby maintain the first split ratio at a substantially constant value.

Flow splitter for gas chromatography systems

A multi-dimensional gas chromatograph for analyzing compounds in a sample during a single run is disclosed. The multi-dimensional gas chromatograph includes a first column, a second column, and a modulator disposed between the first column and the second column. The modulator modulates at (i) a first modulation period over a first time period during the run and (ii) a second modulation period over a second time period during the run later than the first time, the second modulation period being different than the first modulation period.

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St. Joseph, MI, United States of America

David Jesse Borton