METHOD AND DEVICE FOR DETECTING CONTACT OF A PIPETTE TIP WITH A LIQUID AS WELL AS A LABORATORY SYSTEM WITH SUCH A DEVICE

A method for detecting contact of a pipette tip with a surface of a liquid in a pipetting device is disclosed. The method consists of moving the pipette tip in the direction of the surface of the liquid thereby measuring an absolute capacitance between the pipette tip and a reference potential and g...

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Bibliographische Detailangaben
Hauptverfasser:	POPOVIC, Nemanja, DIETERICH, Pascal, FREI, Luca, HARSCH, Sabrina, DÖRNER, Benjamin
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TRANSPORTING
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Beschreibung
Zusammenfassung:	A method for detecting contact of a pipette tip with a surface of a liquid in a pipetting device is disclosed. The method consists of moving the pipette tip in the direction of the surface of the liquid thereby measuring an absolute capacitance between the pipette tip and a reference potential and generating a sampled output signal. A predicted momentary sample value of the output signal is generated based on a plurality of past sample values of the output signal. A contact signal indicative of the pipette tip being in contact with the surface of the liquid is generated based on comparing a momentary sample value of the output signal with the predicted momentary sample value of the output signal. A corresponding pipetting device capable of performing the method as a laboratory system, in particular an automated liquid processing system, with one or more such pipetting devices are proposed.