Multi-dimensional portable gas chromatograph system

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 first detector fluidly connected to the first separation column, and
• 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 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.