Patent ID: 7735352

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 separation column fluidly connected to the at least one pre-concentrator; a thermal conductivity detector fluidly connected to the first separation column; wherein the thermal conductivity detector comprises: 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; a thermistor having an electrical lead; and a first contact pin electrically connected to said electrical lead; wherein the first contact pin is oriented within the first bore, and the first contact pin is electrically insulated from the housing and mechanically secured to the housing.