Patent application number | Description | Published |
20090194680 | Method and Apparatus for Normalizing Performance of an Electron Source - A method for operating a mass spectrometer includes determining a first performance characteristic while operating the mass spectrometer with a first electron emitter, storing first information relating to the first performance characteristic, determining a second performance characteristic while operating the mass spectrometer with a second electron emitter, storing second information relating to the second performance characteristic, and thereafter switching from operation using the first electron emitter to operation using the second electron emitter. The switching includes using the first and second information to normalize performance of the second electron emitter after the switching relative to performance of the first electron emitter before the switching. | 08-06-2009 |
20090194681 | Method and Apparatus for Response and Tune Locking of a Mass Spectrometer - A mass spectrometer and a technique for operating it involve setting an operating parameter that influences a rate of flow of electrons from an electron source into an ion volume so that ions produced from a material in the ion volume in response to electrons satisfy an ion production target, performing a plurality of analytical runs using the mass spectrometer with the electron source while monitoring an operational characteristic, and adjusting the operating parameter in response to the monitoring to compensate for a change over time in the operational characteristic in a manner so that the ion production target remains satisfied. | 08-06-2009 |
20090242747 | Removable Ion Source that does not Require Venting of the Vacuum Chamber - A method and apparatus of combining an ion volume, a lens stack, and an ion optic that similarly cooperates with a detached multipole ion guide is herein incorporated into a single sub-assembly that can be removed from a mass spectrometer instrument without venting. Such an arrangement allows an operator to clean all parts of the ion path that get contaminated in normal operation, reassemble and reinsert in a timely manner and then pump down to an acceptable vacuum without having to vent the system. | 10-01-2009 |
20100077838 | METHOD FOR DETERMINING A LOW CYLINDER PRESSURE CONDITION FOR A GAS CHROMATOGRAPH - A method for determining a low cylinder pressure condition of a gas chromatograph includes providing gas from the cylinder to an inlet of the gas chromatograph. In particular, the gas is provided at a predetermined inlet pressure that is higher than an inlet pressure that is required for a predetermined gas chromatographic analysis routine. The inlet pressure of the gas being supplied to the inlet is increased, in order to attempt to achieve a predetermined check value. It is then determined if the inlet pressure actually increases to at least the predetermined check value. If it is determined that the inlet pressure of the gas does not increase to at least the predetermined check value, then an indication of a low cylinder pressure condition is provided. | 04-01-2010 |
20100223978 | System and Method for a Gas Chromatograph to Mass Spectrometer Interface - A system for interfacing a gas chromatograph (GC) to a mass spectrometer the GC comprising a GC column partially contained within a GC oven, the mass spectrometer comprising a housing enclosing an interior having an ion source, the system comprising: a conduit extending from the GC oven to the mass spectrometer and comprising an interior volume that is contiguous with an interior volume of the GC oven; and a duct extending from a region of relatively high or relatively low pressure within the GC oven to the conduit interior volume and operable so as to transmit a flow of air or gas between the region of relatively high or relatively low pressure and the conduit interior volume, wherein a portion of the GC column extends through the conduit interior volume to the ion source. | 09-09-2010 |
20110138877 | Helium Reclamation Systems and Methods for a Gas Chromatograph - A system for recycling helium carrier gas comprises: a bladder, the bladder interior fluidically configured so as to receive helium-bearing gas output from at least one of a split vent and a septum purge vent of a gas chromatograph; a compartment containing the bladder; a source of pressurized air or gas operable so as to supply pressurized air or gas into the compartment interior so as to compress the bladder containing the helium-bearing gas; a gas reservoir fluidically coupled to the bladder interior so as to receive the helium bearing gas from the compressed bladder interior; and at least one gas purification module configured so as to receive the helium-bearing gas from the gas reservoir and operable to remove contaminants from the helium-bearing gas, an output of the at least one gas purification module being fluidically coupled to a carrier gas inlet of the gas chromatograph. | 06-16-2011 |
20120103064 | Helium Conservation Device for a Gas Chromatograph - A device for conserving helium gas in a gas chromatograph system is characterized in that during the majority of an analytical separation, helium is used as the carrier gas while an auxiliary non-helium gas is used to pressurize the inlet and provide for septum purge and split vent flow. Prior an injection period, a coaxial helium flow is established at the column entrance wherein the coaxial helium flow is less than the column flow. Following the injection and sample transfer period, a coaxial helium flow is established wherein the flow is greater than the column flow. | 05-03-2012 |
20130118231 | Helium Conservation Device for a Gas Chromatograph - A device for conserving helium gas in a gas chromatograph system is characterized in that during the majority of an analytical separation, helium is used as the carrier gas while an auxiliary non-helium gas is used to pressurize the inlet and provide for septum purge and split vent flow. Prior an injection period, a coaxial helium flow is established at the column entrance wherein the coaxial helium flow is less than the column flow. Following the injection and sample transfer period, a coaxial helium flow is established wherein the flow is greater than the column flow. | 05-16-2013 |
20130199267 | Chromatography Column Amenable to Accurate Length Determination and Laser Adapter - A column used for gas chromatography (GC) is fabricated from an open tubular light guiding capillary. The light guiding capillary is suitable for transmission of optical frequencies employed in commercially available hand held laser range finders. | 08-08-2013 |
20140000341 | Method for a Gas Chromatograph to Mass Spectrometer Interface | 01-02-2014 |
20140250978 | Evacuable Inlet for Gas Chromatograph Injector - A gas chromatography (GC) system comprises: a sample injector adapted to receive a liquid sample into an interior cavity thereof and to volatilize the liquid sample; a GC column configured to receive the volatilized sample from the sample injector; a carrier gas inlet line fluidically coupled to a gas inlet port of the sample injector; a septum purge vent line fluidically coupled to a first gas outlet port of the sample injector; a split-flow vent line fluidically coupled to a second gas outlet port of the sample injector; and a vacuum system configured to apply vacuum to the septum purge vent line, the split-flow vent line and the interior cavity of the sample injector. Alternatively, the vacuum system may be coupled to a vacuum port of the sample injector. A separate flow of helium gas may be supplied to an inlet of the GC column. | 09-11-2014 |