Patent ID: 8114200

Claim:
A portable multi-dimensional gas chromatograph, the gas chromatograph comprising: a carrier gas container; a regulator fluidly connected to the carrier gas container; a dopant chamber containing a reference chemical; at least one pre-concentrator which is fluidly connected to the regulator and the dopant chamber, a first separation column fluidly connected to the at least one pre-concentrator; a second separation column fluidly connected to the at least one pre-concentrator; a housing, the housing comprising an insulated valve housing configured to receive a column support, tubing that makes up the first separation column is wrapped around the column support, a column housing and a port plate fitted together; a first detector fluidly connected to the first separation column, the first detector received in an opening defined by the insulated valve housing and the column housing, a second detector fluidly connected to the second separation column, wherein at least one of said first detector and said second detector is a thermal conductivity detector fluidly connected to one of said first and second separations columns, the thermal conductivity detector comprising: a second housing having an internal gas analysis chamber, a fluid inlet passageway in communication with the gas analysis chamber, a fluid outlet passageway in communication with the gas analysis chamber, and a first bore extending through at least a portion of the housing, the first bore in fluid communication with the gas analysis chamber, the first bore offset from the fluid inlet passageway and the fluid outlet passageway.