Abstract: A portable multi-dimensional gas chromatograph, the gas chromatograph including 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.

Abstract: A portable multi-dimensional gas chromatograph, the gas chromatograph including 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.

Abstract: A portable multi-dimensional gas chromatograph, the gas chromatograph including 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.

Abstract: A Gas regulator capable of reducing the pressure of a gas supply from thousands of psi to as low as 30 psi with an accuracy level of +/?1 psi. The regulator uses at least two oppositely oriented gas stages to reduce the pressure. The first stage performs gross pressure reductions and subsequent stages perform fine pressure reductions. The regulator easily connects to commercially available gas bottles and can easily activate or deactivate gas flow without needing to disconnect the gas bottle. The regulator has a compact design and can provide readings which can be integrated into computer, online, or dynamic systems.

Abstract: A separation column assembly for a gas chromatograph and the like is provided. The assembly is a self contained unit which allows very rapid heating and cooling of the column.

Abstract: A thermal conductivity detector comprises a housing having an internal cavity, a fluid inlet, a fluid outlet, a first bore and a second bore. The thermal conductivity detector further comprises a thermistor having a first electrical lead and a second electrical lead, a first contact pin in electrical communication with said first electrical lead and a second contact pin in electrical communication with said second electrical lead. The first contact pin is oriented within the first bore, the second contact pin is oriented within the second bore and the thermistor is suspended within the gas analysis chamber.

Abstract: A thermal conductivity detector comprises a housing having an internal cavity, a fluid inlet, a fluid outlet, a first bore and a second bore. The thermal conductivity detector further comprises a thermistor having a first electrical lead and a second electrical lead, a first contact pin in electrical communication with said first electrical lead and a second contact pin in electrical communication with said second electrical lead. The first contact pin is oriented within the first bore, the second contact pin is oriented within the second bore and the thermistor is suspended within the gas analysis chamber.

Abstract: A Gas regulator capable of reducing the pressure of a gas supply from thousands of psi to as low as 30 psi with an accuracy level of +/?1 psi. The regulator uses at least two oppositely oriented gas stages to reduce the pressure. The first stage performs gross pressure reductions and subsequent stages perform fine pressure reductions. The regulator easily connects to commercially available gas bottles and can easily activate or deactivate gas flow without needing to disconnect the gas bottle. The regulator has a compact design and can provide readings which can be integrated into computer, online, or dynamic systems.

Abstract: A portable multi-dimensional gas chromatograph, the gas chromatograph including 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.

Abstract: A separation column assembly for a gas chromatograph and the like is provided. The assembly is a self contained unit which allows very rapid heating and cooling of the column.

Abstract: A method for tracking products as they move through a supply chain is disclosed. The method involves using an identification tag reader to scan a machine-readable identification tag that is attached to a first product. The machine-readable identification tag includes an encoded version of a product identifier that uniquely identifies the first product. The identification tag reader decodes the encoded version of the product identifier and obtains the product identifier. A product database is then accessed to determine whether a next action that may be taken with respect to the first product is allowable. The next action is not allowable unless a current value of a state associated with the product identifier in the product database is equal to one of a set of allowed values.