Abstract:
Die Erfindung beschreibt ein Hochdruck-Spritzenpumpensystem für die Anwendung im Bereich der HPLC, UHPLC, Mikro- und Nano-HPLC im Gradientenbetrieb. Die unterschiedlichen Lösungsmittel werden durch passive Rückschlagventile unabhängig komprimiert, die Lösungsmittelzusammenführung erfolgt erst bei gleichem Druck, der Zieldruck für die Initialisierung wir durch eine Regelvorgabe mit höherer Förderleistung erreicht, bei der auch die Kompressibilität berücksichtigt wird. Das Ändern von Lösungsmitteln sowie das Spülen der Pumpenköpfe erfolgt durch getrennte Ein- und Ausgänge im Durchfluss über ein aktives Multipositions-Hochdruckventil, welches auch den Pumpenkopf verschliessen und über das passive Rückschlagventil öffnen kann. Die Regeleinheit und der Antriebsmotor, welcher auch als Kraftsensor dient, erfaßt Kompressibilität, Lufteinschlüsse und Undichtigkeiten. Je nach Ausführung werden die Spritzenpumpenköpfe thermisch stabilisiert.
Abstract:
The present invention generally recites a method, system and apparatus for fluid analysis and more specifically recites a method system and apparatus for multistage injection of a fluid to be analyzed into a fluid analysis instrument.
Abstract:
A rotary valve for selectively connecting at least one component (51, 52) into a fluid path. According to the invention the inner stator face (I l ia, 211a) comprises orifices (131b-136b; 231b- 236b) and said inner rotor face (112a, 212a) comprises at least a first groove (121, 221), a second groove (122, 222), and a third groove (123, 223) so arranged that the rotary valve can take at least three different rotary positions, in which either both components are bypassed, only one of the components is connected and the other bypassed or both components are connected to a main flow.
Abstract:
A method for processing a fluid is applied to systems that include a valve unit that has a sample-loading state and a sample-injecting state. The sample-loading state disposes a sample loop in fluidic communication with a sample conduit. The sample-injecting state disposes the sample loop in fluidic communication with a process conduit. The method involves transferring a sample through both the sample conduit and the valve unit so that a leading end of the sample exits the valve unit. After transitioning the valve unit to the sample-loading state and allowing the sample loop to decompress, at least some of the transferred sample is loaded into the sample loop. A fluid-processing instrument includes a value unit and a control unit that manages operation of the instrument. The control unit is configured, for example, to implement the above-described method.
Abstract:
The present invention is related to a sampling technique for volatiles and its use to concentrate and/or detect and/or separate chemical components of complex mixtures thereof that enable the automatic on-line sampling and real-time analysis of volatiles present at low concentrations, for example in the headspace.
Abstract:
Described herein are a selectable flow restriction device and a fluidic network for chromatographic sample dilution during injection. A selectable flow restriction device is used in combination with a splitter to define an adjustable splitter for separating a high-pressure solvent flow into two separate solvent flows having the same solvent composition. The first solvent flow passes to a sample manager where a sample is injected as a discrete fluidic plug at an injection valve into a flow comprising at least one solvent. The second solvent flow is merged downstream from the location of injection with the first solvent carrying the sample fluidic plug. The second solvent flow dilutes the sample plug during the mixture of the two solvent flows.
Abstract:
Disclosed are non-contiguous sample fractionating and concatenating device and a dual online multidimensional liquid chromatography system having the same. The non-contiguous sample fractionating and concatenating device according to an embodiment of the present disclosure includes a sample supply module which supplies a sample to be analyzed, and a sample fractionation module connected to the sample supply module, and which is continuously supplied with the sample, sets a plurality of unit sample supply times obtained by equally dividing a total sample supply time during which the sample is supplied from the sample supply module, sets a plurality of unit fractionation intervals obtained by equally dividing each of the plurality of unit sample supply times, and concatenates and stores the sample supplied during corresponding unit fractionation intervals within each unit sample supply time to acquire a plurality of fractions.
Abstract:
A system includes a phase behavior analysis unit having a housing, a heating system connected to the housing and arranged to heat an interior of the housing, a pressure cell positioned in the interior of the housing, and a three-way valve with one inlet fluidly connected to a chamber in the pressure cell and two outlets. The system also includes a gas chromatograph that is fluidly coupled to the chamber in the pressure cell via the three-way valve.
Abstract:
A method and a fluidic network for acquiring and injecting a chromatographic sample into a chromatography system flow include a metering pump module, a sample needle, a needle seal and an injection valve. The metering pump module includes a metering pump and a pressure transducer in serial fluidic communication. When the injection valve is in a first valve state, the injection valve is configured to fluidically terminate ports of the metering pump module. When the injection valve is in a second valve state, the injection valve is configured to fluidically couple a fluidic path that includes the metering pump module and sample needle into the system flow of a chromatography system without resulting in a substantial change in the pressure of the system flow.