Boehringer Mannheim Gmbh

Hitachi-high-technologies Corporation

Roche Diagnostics Gmbh

F. Hoffmann-la Roche Ag

Leonhard Geissler

Karl-Heinz Mann

Horst Menzler

Hans Schels

Hans-Juergen Mueller

Bernd Drescher

Hubert Paul

Andrea Sigl

Georg Kuffer

Claudia Ehle

Takeroni Okusa

The invention relates to a system for mixing a liquid with another liquid or a solid material by blowing a gas onto the surface of the liquid. The invention further relates to a system for implementing said method. Gas is blown onto the surface of the liquid from a distance which can be adjusted by determining the level of the liquid. A system of the invention, hence, comprises a device for blowing a gas onto the surface of a liquid and a device for detecting the level of a liquid.

Method and system for mixing liquids

Liquid transfer device for an analysis unit with a capacitive liquid level detector (10) for detecting the dipping of a liquid transfer needle (5) into an analysis liquid (4). More reliable operation, in particular a better ratio between useful signal and noise signals, is achieved by the fact that the liquid transfer needle (5) is part of a coaxial electrode arrangement (11). The coaxial electrode arrangement includes, in addition to the liquid transfer needle (5), at least one coaxial electrode (12, 13) surrounding the needle and insulating from it and a detection circuit (17). This detection circuit detects a change in capacitance between the electrodes (5, 13) of the liquid level detector (10), and includes an isolation amplifier circuit (23) to whose input (23a) and output (23b) two adjacent electrodes (5, 12) of the coaxial electrode arrangement (11) are connected as signal electrode and compensating electrode. As a result of this structure, no voltage difference occurs between the signal electrode and the compensating electrode.

Liquid transfer device for an analysis unit

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Tutzing, Germany

Leonhard Geissler