Abstract:
A mixer for mixing a fluid having a property varying along a flow direction of the fluid includes an inlet configured for receiving an inlet flow, an outlet configured for providing an outlet flow, and a plurality of flow channels coupled between the inlet and the outlet. The mixer also includes a flow distributor for distributing the inlet flow into the plurality of flow channels so that each flow channel receives a partial flow from the inlet flow, and a flow combiner for combining the partial flows from the plurality of flow channels to the outlet flow. Each flow channel has a first flow section having a hydraulic resistance substantially representing a hydraulic resistance of the flow channel. One or more of the flow channels each have a second flow section coupled in series with the first flow section of the respective flow channel.
Abstract:
A fluid supply system configured for metering two or more fluids in controlled proportions, including a plurality of solvent supply lines, a pumping unit configured for taking in fluids from selected solvent supply lines and for supplying a pressurized mixture, a proportioning valve configured for modulating solvent composition by sequentially coupling selected ones of the solvent supply lines with the inlet of the pumping unit, a sensor configured for sensing process information in the fluid supply system, an analysis entity configured for analyzing the process information for determining reciprocating element related information at a beginning of fluid intake, and a control unit configured for switching the proportioning valve to sequentially couple selected ones of the solvent supply lines to the inlet of the pumping unit at one or more switching points based on the given metering scheme and based on the reciprocating element related information.
Abstract:
A fluid pump for a fluid separation device for separating a fluid includes a fluid inlet being supplyable with fluid at an inlet pressure (pI), and a fluid conducting mechanism configured for conducting the fluid supplied to the fluid inlet towards a connected fluidic path, in which the fluid conducting mechanism is controllable so that, regardless of a value of the inlet pressure (pI), the fluid is continuously conducted away from the fluid inlet with a definable flow rate (FT).
Abstract:
A fluidic device for providing fluidic connections is described. The fluidic device comprises a fluid conduit and a planar coupling member with a fluid port, the fluid port being fluidically connected with the fluid conduit. A contour of the planar coupling member is in a predefined relationship with the fluid port's position.
Abstract:
A supply flow path for supplying a solvent is described. The supply flow path includes metering devices each with a piston, the metering devices being adapted for metering the solvent through separate source paths feeding the supply flow path. The supply flow path further includes a control unit adapted for controlling the metering devices' piston movement in accordance with solvent pressure, wherein a variation of the solvent pressure gives rise to a corresponding variation of a solvent volume contained in the supply flow path or a part thereof. The control unit is adapted for compensating for the variation of the solvent volume by corresponding movements or forward or backward displacements of the pistons.
Abstract:
A method for controlling movement of a piston in a metering device is described. The method comprises supplying a fluid by actuating the metering device's piston, wherein compression or expansion of the fluid causes corresponding temperature variations. The method further comprises superposing a corrective movement onto the piston movement, with the corrective movement at least partly compensating for at least one of thermal expansion and contraction of the fluid induced by the temperature variations. In one embodiment, the corrective movement imposed onto the piston movement comprises two components: a reduction (74) of the compression jump (73), and a subsequent increase (75) of the piston's forward displacement rate (71) during a period (76) of time (72).
Abstract:
A liquid delivery system having at least one channel, at least one valve within that channel, at least one flow sensing device within that channel, and a pressure source downstream of the valve capable for generating variable pressures.
Abstract:
A sample injector for a liquid analysis device includes a multi-route switching valve and a sample conduit. The valve alternatively connects a solvent pump directly to a chromatographic column or via a sample conduit. The sample injector further has a flush solvent delivery device. The flush solvent delivery device delivers at least one flush solvent to the sample conduit of the sample injector. The sample injector also has a sample intake device. The sample intake device provides liquid sample to the sample conduit.