Hamilton Bonaduz Ag

Reto Ettinger

Fridolin Gysel

Hanspeter Romer

Jürg Rast

Jonas Hilti

Silvio Walpen

An integrated motor cartridge () for connection to and for use in a pipetting system comprises a housing (); a guide tube (); a piston () provided with a plurality of permanent magnets (), the piston having a pressure tube facing side and a pressure tube distal side, the piston being arranged in the guide tube and the piston having at least one seal () with respect to the guide tube; and a coil assembly () by means of which the piston can be moved in the guide tube when power is supplied to the coil assembly; wherein the guide tube, the piston and the coil assembly are arranged in the housing. The integrated motor cartridge further comprises a pressure tube connection () by means of which the guide tube, on the pressure tube facing side of the piston, can be connected to a pressure tube of the pipetting system in a gastight manner; and a power connection () which is coupled to the coil assembly and adapted to be coupled to a power supply arranged outside of the integrated motor cartridge; wherein the integrated motor cartridge can be introduced into and removed from the pipetting system as a unit.

Integrated motor cassette for connection to and for use in a pipetting system, pipetting system, and method for exchanging an integrated motor cassette of a pipetting system

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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Uster, Switzerland

Reto Ettinger