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7621171 |
Method and apparatus for sample analysis
Methods and systems for analyzing samples, such as gas samples, are described. One method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a...
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7508521 |
Pressure-invariant trace gas detection
A system includes a light source, a detector, at least one pressure sensor, and a control unit. The light source emits light at a wavelength substantially corresponding to an absorption line of a...
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7474965 |
System and method for identifying molecules
A system and method for identifying molecules. Molecules are identified from a gaseous matter having the molecules and flowing at two different flow rates. A system and method for identifying a...
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7437906 |
Flow regulator device for an analytical circuit and its use in chromatography
A flow regulator device for an analytical circuit, characterised by comprising: a fluid restriction (R) of defined characteristics related to the field of application of the analytical circuit, a...
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7360434 |
Apparatus and method to measure air pressure within a turbine airfoil
A pressure tap probe having a flexible probe tip that is flexible enough to seal a film cooling hole having a roughened surface such as a TBC applied around the hole. The flexible probe tip is...
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7225085 |
Precision gas flow meter
A precision gas flow meter that is capable of measuring small flow rates of gasses precisely in the range of 0.01 to 10 L per minute. The meter is designed to measure the gas flow in small volume...
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7207224 |
Wide-range combination vacuum gauge
A combination vacuum gauge provides simultaneous absolute and differential pressure measurements over a wide range of pressures ranging from atmospheric pressures to ultrahigh vacuum by processing...
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7145467 |
Medical gas alarm system
A medical gas alarm system for use in a healthcare facility having a medical gas system and having a network of computer devices is provided. The alarm system includes at least one area alarm...
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6987448 |
Medical gas alarm system
A medical gas alarm system for use in a healthcare facility having a medical gas system and having a network of computer devices is provided. The alarm system includes at least one area alarm...
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6813929 |
Method and apparatus for monitoring fluid flow
An apparatus for monitoring fluid flow within a high pressure liquid chromatography system. The apparatus includes a pump for supplying a system flow of eluent to the system, a chromatography...
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6779405 |
Method of measuring vacuum pressure in sealed vials
The present invention provides a fast and accurate method of measuring the vacuum pressure in a sealed glass vial or other electrically non-conductive vessel. In the method the vial or vessel to be...
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6494078 |
Retention-time locked comprehensive multidimensional gas chromatography
A method applies retention-time locking to the retention times and/or the column(s) void times of a target analyte(s) being eluted thru a multidimensional gas chromatography system. Retention time...
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6386014 |
Energy measurement device for flowing gas using microminiature gas chromatograph
A system for determining the energy and volume delivered by a flowing natural gas carried within a pipeline based on BTU content analysis of the natural gas using a micro-miniature gas...
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6153438 |
Retention factor database
A method for identifying analytes of interest by referencing to a retention factor database corresponding to a plurality of identified analytes that is independent of column dimensions and carrier...
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5846293 |
Method for admitting and receiving samples in a gas chromatographic column
A method of admitting and receiving a sample into a gas chromatographic column is provided in which a step increase in pressure is performed in combination with the application of a negative axial...
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5827946 |
Method for sample identification using a locked retention time database
The invention provides a method for developing a retention time database of identified analytes and their respective retention times in a reference Gas Chromatograph (GC) system under locked...
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5782964 |
Gas chromatography column assembly temperature control system
A temperature control system (10) is provided for controlling temperature parameters in a gas chromatography column assembly (18). The temperature control system (10) includes an extended length...
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5545252 |
Flow regulation in gas chromatograph
A gas chromatographic system includes a column and an injector for delivering into the column a test portion of flow. The injector has an exit passage for discharging a split portion of carrier...
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5524084 |
Method and apparatus for improved flow and pressure measurement and control
In the preferred embodiment, the invention is embodied in the pneumatic manifold of a gas chromatograph to provide current operating temperature and pressure compensation of inlet fluid flow. The...
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5476000 |
Retention time stability in a gas chromatographic apparatus
The effect of barometric pressure variation on the retention time stability of a chromatographic analytical system is compensated by active control of the amount of fluid flow by way of a fluid...
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5428985 |
Gas leak detection apparatus and methods
An improved gas leak detection apparatus is disclosed for detecting a leak in a gas containing vessel of constant volume which compensates for deviations in behavior of a contained gas from an...
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5379629 |
Method and apparatus for regulating the carrier gas pressure for separation column arrangements in gas chromatography
A method for stabilizing a pressure differential in a first of two successive gas chromatographic separation columns of a valveless separation column arrangement includes the step of supplying a...
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5235235 |
Multiple-frequency acoustic wave devices for chemical sensing and materials characterization in both gas and liquid phase
A chemical sensor (1) includes two or more pairs of interdigital electrodes (10) having different periodicities. Each pair is comprised of a first electrode (10a) and a second electrode (10b). The...
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5166076 |
Device and method for sample dosing in gas chromatography
A dosing device has a flow divider connected between a carrier gas source and a gas chromatography separating column, in particular a capillary column. The flow divider has a conduit with an...
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4512181 |
Pressure compensation for a chromatograph
In a chromatographic analysis, errors in the chromatographic analysis caused by barometric pressure variations are corrected by dividing the actual measured analysis (C m ) by a correction factor...
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4359891 |
Repetitive chromatographic apparatus
A repetitive gas chromatograph employing a backflush valve downstream from the detector and a separate sample injection valve located upstream located directly upstream from the single...
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4271695 |
Apparatus for feeding carrier gas to on-column injectors
An apparatus for feeding carrier gas at a constant rate to on-column injectors for capillary and micropacked gas-chromatographic columns. The apparatus includes a constant pressure gas delivering...
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4196612 |
Pressure regulator for a chromatograph
A method and apparatus is disclosed for providing a very reproducible chromatographic analyzer output by reducing variations in the chromatographic analyzer output due to changes in barometric...
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4141237 |
Pressure compensation method and apparatus for a chromatograph
A method and apparatus is disclosed for correcting errors in a chromatographic analysis caused by changes in ambient atmospheric pressure. The output signal from a chromatograph is summed with the...
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4123236 |
Gas chromatograph device
An improved high resolution chromatograph device operable at column pressures ranging between one and fifty atmospheres absolute measured at the column exit, means for closely regulating the column...
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4067226 |
Chromatographic apparatus
A gas chromatographic apparatus especially useful in analyzing low boiling materials is provided with means for flowing a pressurized liquid sample through the sampling valve, during the sampling...
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3800593 |
GAS SAMPLING APPARATUS FOR CHROMATOGRAPHS
A gas sampling apparatus for use in conjunction with a gas chromatograph in which there are no moving parts in the sample flow path, and the size of the sample is controlled and measured by the...
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3790348 |
APPARATUS FOR DETERMINING THE CARBON MONOXIDE, METHANE AND TOTAL HYDROCARBONS CONTENT IN AIR
An air sample to be analyzed for carbon monoxide and methane is delivered to a chromatograph column that is connected by a reactor with a hydrogen flame ionization detector. The reactor converts...
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3483731 |
TRACE COMPONENT CHROMATOGRAPHY
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3474659 |
METHOD AND APPARATUS FOR ATMOSPHERIC SAMPLING
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3444722 |
DEVICE FOR SUPPLYING CARRIER GAS TO TRANSPORT ELUTED PORTION OF SAMPLE AND TO BACKFLUSH CHROMATOGRAPHIC COLUMN
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3422665 |
CHROMATOGRAPHY SYSTEM
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3405551 |
Pressure program device for chromatographic column
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3283563 |
Gas chromatographic system having barometric pressure compensation
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3240052 |
Pressure and flow rate regulation in a fluid circulation system
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3104541 |
Gas chromatograph with improved zero shift
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2964938 |
Chromatographic gas analysis sample control system
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2839152 |
Chromatography method and apparatus
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