A system and method for performing field-portable GC/MS measurements for the rapid sampling and measurement of high temperature boiling semi-volatile organic compounds in environmental samples, wherein other column bundles have cold spots that may prevent high temperature boiling semi-volatile components from eluting the GC column, this new design may eliminate those cold spots on the GC column.

A thermoresistive gas sensor includes two identical, flat meshes that consist of a semiconductor material with a predetermined type of conductivity and that are interconnected in sections of an electric measuring bridge that are diametrically opposite one another, wherein each mesh of the two identical, flat meshes has mesh webs that extend parallel, adjacent to one another and that are connected electrically in parallel at the ends, where the mesh webs of the two meshes extend alternately adjacent to one another in a shared mesh plane horizontally across a window opening in a carrier plate.

A system and method for performing field-portable GC/MS measurements for the rapid sampling and measurement of high temperature boiling semi-volatile organic compounds in environmental samples, wherein other column bundles have cold spots that may prevent high temperature boiling semi-volatile components from eluting the GC column, this new design may eliminate those cold spots on the GC column.

A column oven includes a main unit, an auxiliary unit, an outside sensor, an internal sensor, a temperature range holding section for holding a plurality of temperature ranges, a temperature range specifying portion for specifying the temperature range to which the outside temperature belongs, a temperature control program holding section for holding a temperature control program for a control method of the main unit and the auxiliary unit in each temperature range in such a way that outputs of the main unit and the auxiliary unit are continuous in the temperature ranges that are adjacent to each other, a control method setting portion for setting a control method of the main unit and the auxiliary unit based on the temperature range specified and the temperature control program, and a temperature control portion for controlling the main unit and the auxiliary unit.

A heating assembly includes a base plate. The heating assembly also includes a heating component coupled to the base plate configured to heat an enclosure of the heating assembly and a fan assembly coupled to the base plate configured to circulate the heated air within the enclosure of the heating assembly.

A system and method for sample analysis using a portable gas chromatography (GC)-mass spectrometry (MS) is provided. The GC-MS system includes an injector configured to accept a sample containing a mixture of chemicals and release at least part of the sample for a separation by GC, a MEMS GC column with an integrated heater configured to accept and at least partly separate the mixture of chemicals, and a mass analyzer in a vacuum chamber configured to accept and mass-analyze the released separated chemicals. The MEMS GC column with the integrated heater is located mostly inside the MS vacuum chamber.

Techniques are described for accelerating thermal equilibrium in a chromatographic column. An apparatus comprises a chromatography column, and a plurality of temperature control units in thermal contact with the chromatography column. A method of performing liquid chromatography comprises setting an inlet of a chromatography column to a first temperature using a first temperature control unit in thermal contact with said inlet, setting an outlet of the chromatography column to a second temperature using a second temperature control unit in thermal contact with the outlet, wherein the first temperature is less than the second temperature; and injecting a sample into a liquid stream that flows through the chromatography column after the inlet is set at the first temperature and the outlet is at the second temperature.

A method for modulating analytes in a gaseous stream passing through a capillary, wherein the analytes are retained in a trapping zone of the capillary, or allowed to pass therethrough, based on certain conditions. The method includes, during a first time period, heating the trapping zone of the capillary to a first temperature to desorb analytes therewithin and allow the analytes to pass therethrough, and during a second time period, cooling the capillary to a second temperature that is sufficient to trap and focus the analytes within the trapping zone. During the first time period, the method also includes retaining heat at the capillary during to minimize the load on a cooling device thermally connected thereto, and during the second time period, selectively allowing thermal transfer toward the cooling device.

A system and method for performing field-portable GC/MS measurements for the rapid sampling and measurement of high temperature boiling semi-volatile organic compounds in environmental samples, wherein other column bundles have cold spots that may prevent high temperature boiling semi-volatile components from eluting the GC column, this new design may eliminate those cold spots on the GC column.

A system and method for performing field-portable GC/MS measurements for the rapid sampling and measurement of high temperature boiling semi-volatile organic compounds in environmental samples, wherein other column bundles have cold spots that may prevent high temperature boiling semi-volatile components from eluting the GC column, this new design may eliminate those cold spots on the GC column.