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8114200 |
Multi-dimensional portable gas chromatograph system
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...
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8104326 |
Methods and devices for circulating air
A gas chromatography system comprising a sample introduction device, an oven coupled to the sample introduction device and a detector coupled to the oven is disclosed. In certain examples, the oven...
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8075768 |
Liquid chromatograph device
A liquid chromatograph device was provided wherein operations inside a thermostatic chamber can be safely performed even while a heat block is being heated. The liquid chromatograph device...
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7947112 |
Method for degassing a fluid
A method for degassing a fluid includes providing a degassing system having a degassing module and a fluid pump apparatus having a fluid reservoir, wherein the fluid pump apparatus is operated in a...
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7928370 |
Open probe method and device for sample introduction for mass spectrometry analysis
An open probe method for sample introduction into a mass spectrometer is disclosed, comprising the steps of: loading a sample holder with sample compounds to be analyzed; heating a probe oven;...
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7832253 |
Portable weather resistant gas chromatograph system
A portable weather resistant gas chromatograph system with a gas chromatograph enclosure having a body and a movable door and a seal, a gas chromatograph with a frame assembly removably secured in...
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7824478 |
Methods and systems for characterizing a sorbent tube
Disclosed are systems and methods that include providing a vessel having an inlet and an outlet for communicating a carrier gas through the vessel; determining a differential pressure between the...
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7806963 |
Apparatus, system, and method for improved power utilization in a gas chromatography sensor
An apparatus, system, and method are disclosed for broad spectrum chemical detection. The method includes detecting an ambient temperature and setting a target temperature based on the ambient...
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7544233 |
Gas chromatograph with a mass spectrometer situated down therefrom, and method for performing the gas chromatographic/mass spectrometric analysis of a substance mixture
The aim of the invention is to optimize the analysis of substances separated by gas chromatography with a gas chromatograph, comprising a separating device and a mass spectrometer situated down...
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7534286 |
Methods and systems for cooling a chromatographic column
Systems and methods for cooling a chromatographic column is disclosed generally, comprising heating a chromatographic column, supplying fluid into the column via the inlet end of the column at an...
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7520920 |
Guard columns for gas chromatographs and gas chromatograph-mass spectrometers
The present invention discloses a gas chromatograph assembly. In one implementation, the assembly includes a sample injector and a guard column assembly. The guard column assembly includes a guard...
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7468095 |
System for controlling flow into chromatographic column using transfer line impedance
A system for controlling the flow rate into a chromatographic column is disclosed generally comprising communicating a fluid to the column through a transfer line, measuring the transfer line inlet...
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7422625 |
Methods and systems for characterizing a sorbent tube
Disclosed are systems and methods that include providing a vessel having an inlet and an outlet for communicating a carrier gas through the vessel; determining a differential pressure between the...
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7396386 |
Method and apparatus for keeping constant the retention times in a gaschromatographic analysis
A method for obtaining reproducibility of the retention times of the components of a mixture to be analysed in an apparatus for gaschromatographic analysis provided with a capillary column, when...
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7343779 |
High performance, hand-held gas chromatograph, method and system
A hand-held, ultra-sensitive gas chromatograph which provides real time detection and analysis of chemical compounds or impurities is disclosed. The detection sensitivity ranges from parts per...
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7303610 |
Chromatography column assembly
Chromatography column assembly of the direct heating type, comprising at least a capillary column, at least a tubular structure which envelops the capillary column and is coaxial with it, means to...
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7267796 |
Preparative liquid chromatograph using plural detectors
The preparative liquid chromatograph uses a plurality of detectors including a mass spectrometer, and a chromatogram generator is provided for generating a plurality of chromatograms each...
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7258132 |
Electronically controlled back pressure regulator
An electronically controlled back pressure regulator comprises an analysis device having a vent coupled to the analysis device through a vent path, a pressure sensor coupled to the vent path, a...
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7247189 |
Device for combining two fluid streams
A fluidic switching device is particularly for use in chromatography is described. The device allows a rapid switching between chromatographic columns; particularly, in gas chromatography.
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7168298 |
Mass-sensitive chemical preconcentrator
A microfabricated mass-sensitive chemical preconcentrator actively measures the mass of a sample on an acoustic microbalance during the collection process. The microbalance comprises a chemically...
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7147695 |
Microfabricated microconcentrator for sensors and gas chromatography
Devices for enhancing the sensitivity of a microsensor or any other micro device by providing on-line preconcentration. Microconcentrators that can be integrated with a sensor or a micromachined GC...
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7135056 |
Method and system for sub-ambient pressure control for column head pressure in gas chromatography systems
Methods and system for sub-ambient pressure control for column head pressure in gas chromatography (GC) systems. The GC system includes an inlet and a capillary column connected to the inlet. The...
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7121276 |
Personal oxygen concentrator
An oxygen separator for separating oxygen from ambient air utilizing a vacuum swing adsorption process has a mass of less than 2.3 kg. A carrier is mountable on a person to support the oxygen...
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6929678 |
Purge and trap concentrator with improved drying
A purge and trap concentrator and a method for drying a stream of sample gas in a gas analysis instrument. A dryer tube has an inlet that receives a stream of sample gas during a drying interval...
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6894784 |
Foam detector and disruptor
An apparatus and method are disclosed to detect foam above a liquid sample in a sparge vessel, and disrupt any foam that may exist. The foam sensor includes an optical emitter and optical sensor...
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6838288 |
Modulator for gas chromatography
This invention relates to a modulator for use in gas chromatographic analysis, adopted for alternatively trapping and releasing fractions of solutes in a length of a capillary column within a...
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6719826 |
Method and apparatus for sample injecting in gas chromatography
A method and an apparatus for sample injection in gas chromatography increases the injecting volume of a sample, and can analyze any of high-boiling-point compounds, low-compounds boiling-point...
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6706535 |
Pulsed carrier gas flow modulation for selectivity enhancements with gas chromatography using series-coupled column ensembles
A gas chromatography system having a computer-controlled venting valve system that delivers pressurized pulses to a column junction point of two series-coupled columns having different...
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6706091 |
Sub-to super-ambient temperature programmable microfabricated gas chromatography column
A sub- to super-ambient temperature programmable microfabricated gas chromatography column enables more efficient chemical separation of chemical analytes in a gas mixture by combining a...
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6666907 |
Temperature programmable microfabricated gas chromatography column
A temperature programmable microfabricated gas chromatography column enables more efficient chemical separation of chemical analytes in a gas mixture by the integration of a resistive heating...
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6649129 |
Method and apparatus for concentrating a VOC sample
A system for concentrating a volatile organic compound (VOC) sample uses in one embodiment a bypass line and a valve coupled thereto to regulate an amount of carrier gas flowing through a carrier...
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6579345 |
Chromatography apparatus with direct heating of the capillary column
A method and an apparatus for chromatography are described, wherein at least one element in electrically conductive material is provided to heat the capillary column in a direct way and wherein the...
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6550961 |
Thermal conductivity detector
A thermal conductivity detector includes not only a thermal conductivity detector cell disposed so as to be heated by heat transmitted from a first heater block and a column connector connected to...
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6527835 |
Chemical preconcentrator with integral thermal flow sensor
A chemical preconcentrator with integral thermal flow sensor can be used to accurately measure fluid flow rate in a microanalytical system. The thermal flow sensor can be operated in either...
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6514316 |
System for improving the maximum operating temperature and lifetime of chromatographic columns
Capillary column oxidation in gas chromatography systems, particularly of polyimide clad columns, is a major cause of column failure and it limits the maximum temperature at which columns can be...
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6485543 |
Gas chromatography oven heaters
A gas chromatography system with suspended tubular separation column(s) in an enclosed convection oven where a gas medium is heated by at least two electrically powered heaters. A kit to modify gas...
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6474136 |
Method and apparatus for analyzing impurities in gases
There are provided a method and an apparatus capable of accurately analyzing impurity component having high adsorptivity or reactivity in a short time. Prior to starting measurement, predetermined...
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6447581 |
Gas flow switching device
To switch gas flows between gas sources and gas sinks, a gas flow switching device includes gas passages, which communicate with one another and which have connecting points for the gas sources and...
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6306200 |
Hand-held multiple system gas chromatograph
A multiple parallel hand-held gas chromatograph (GC) system which includes several independent GCs. Each independent GC has its own injector, separation column, detector and oven and the GCs are...
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6248158 |
Oven housing module in an analytical instrument
Energy efficiency of a thermal zone in an analytical instrument is improved by use of an oven housing module having an enclosure body defining an oven cavity, wherein the enclosure body exhibits a...
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6223584 |
System and method for vapor constituents analysis
A system for analysis of vapor constituents in a gaseous and/or liquid media includes an analyzing gas chromatographic unit, an in-line preconcentrator assembly having a trap housing, an adsorbent...
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6074461 |
Chromatograph having a gas recycling system
A chromatograph includes an inlet for receiving a sample and a pressurized carrier fluid flow and in response providing a sample/fluid mixture; a separation column located in a...
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6036747 |
Column specific parameters for retention time locking in chromatography
The present invention provides an improved method for calculating and adjusting the column head pressure of a GC instrument based on the column's plate capacity, Nc, and film thickness, ds,...
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6007602 |
Apparatus and method for chemical modulation
An apparatus and a method are described for forming a chemical modulation of a substance present in a fluid stream, which utilize a movable device, such as a movable heater, to induce changes in...
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5954860 |
Inductively heated cold-trap analyte injector
An injector for a gas chromatography system resistively heats an included cold trap by magnetically inducing a high-frequency current therethrough to inject absorbed analyte into a gas...
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5952556 |
Gas chromatograph with carrier gas control system
A gas chromatograph includes a carrier gas supply flow path to which a pressure sensor, resistance tube, and control valve are sequentially connected. A differential pressure sensor is situated on...
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5933357 |
Backflushing system for gas chromatography
A method where the relationship between the observed retention time and the applied carrier gas pressure can be fitted to an expected theoretical relationship and thus enable the retention time on...
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5922106 |
Automated gas chromatography
An apparatus and process for the continuous, near real-time monitoring of low-level concentrations of organic compounds in a liquid, and, more particularly, a water stream. A small liquid volume of...
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5846292 |
Chromatograph with column extraction
A gas chromatograph and method of chromatography are provided. Analytes, those compounds to be tested, are extracted from the sample by moving the sample into a column which has a stationary phase...
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5830353 |
Oven safety feature
An oven for a chromatograph is shown in which an oven vent is located with respect to an oven fan assembly and an oven vent assembly. In certain operating conditions, the oven fan assembly and the...
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