Hamilton Bonaduz Ag

Jürg Rast

Fridolin Gysel

Reto Ettinger

Hanspeter Romer

Jonas Hilti

The present application relates to a pipetting device and a pipetting method for pipetting, therefore for aspirating and/or dispensing, a metered liquid using a working gas, independently of the flow- and/or wetting characteristics of the metered liquid, wherein a pipetting channel comprises a first working region, of which the known base temperature is in a lower base temperature range, and a second working region, of which the known working temperature is in a working temperature range that is increased with respect to the base temperature range.

Device and method for exact liquid-class-independent pipetting

A pipetting device includes a pipetting channel at least partially filled with working gas, a pipetting tip accessible through a pipetting opening such that the volume of dosing liquid drawn into the receiving chamber can be varied by changing the pressure of the working gas in the receiving chamber, a pipetting piston for changing the pressure of the working gas and accommodated in the pipetting channel to be movable along the pipetting channel, a drive driving the pipetting piston to perform a movement along the pipetting channel, a control device controlling the drive, and a pressure sensor sensing the pressure of the working gas. The control device controls the drive to generate a pressure pulse in the pipetting channel based on the pressure signal output by the pressure sensor whereby the pressure of the working gas during the pulse follows a predefined working gas target pressure pulse curve.

Pipetting device for pulsed pipetting with a pipetting piston movement controlled on the basis of a detection of the piston position

There is provided a method for contactless determination of the position of a driven moving portion () of an electric motor () by means of a plurality of magnetic field sensors (), wherein the moving portion is movably arranged with respect to a stator () and has a plurality of permanent magnets () which generate a moving-portion magnetic field having a plurality of periodically spaced apart maxima, and wherein the plurality of magnetic field sensors are arranged along a movement path () of the moving portion. The method comprises the following steps: by means of the plurality of magnetic field sensors, determining a plurality of measured values () for a momentary magnetic field that is generated by the plurality of permanent magnets and dependent on the position of the moving portion, determining a specific spectral signal component () from the plurality of measured values (), the specific spectral signal component having the spatial frequency corresponding to the distance between adjacent like maxima of the moving-portion magnetic field, and determining the position of the driven moving portion by means of the specific spectral signal component.

Method for contactlessly determining the position of a driven rotor of an electric motor, electric motor, and pipetting system for aspirating and dispensing pipetting liquid having such an electric motor

A pipetting apparatus and method for pulsed dispensing of small metered-liquid doses of no more than 1 &#x3bc;l. The apparatus includes a pipetting conduit at least partly filled with working gas, a pressure-modifying apparatus for modifying the pressure of the working gas, and a control apparatus for applying control to the pressure-modifying apparatus. The control apparatus can control the pressure-modifying apparatus so as to generate in the pipetting conduit, with respect to a reference holding pressure in the pipetting conduit which is necessary for immovable holding of the metered-liquid quantity, an overpressure pulse having a pulse duration of no more than 40 ms.

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Schmerikon, Switzerland

Jürg Rast