Roche Diagnostics Operations, Inc.

Roche Diagnostics Gmbh

F. Hoffmann-la Roche Ag

Markus Brunner

Olivier Elsenhans

Jürg Dual

Vuk Siljegovic

Frank May

Vulk Siljegovic

A level sensor apparatus is disclosed for detecting contact of a pipetting needle with a liquid contained in a vessel. The apparatus includes a sensor head made up of a pipetting needle, a needle holder, and an electromechanical transducer. The sensor head also has an associated mechanical resonance frequency. An electrical signal generator is used to generate a driving signal which when applied to the electromechanical transducer causes vibration of the pipetting needle at the resonance frequency. A measurement device is used to measure a parameter of a vibration signal indicative of the mechanical vibration of the pipetting needle when it is driven by the driving signal. An electronic circuit and associated computer software is provided to evaluate variation of the vibration signal with time and thus detect contact of the pipetting needle with a liquid contained in the vessel.

Level sensor apparatus for detecting contact of a pipetting needle with a liquid in a vessel

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Breitenbach, Switzerland

Markus Brunner