Method and device for monitoring a liquid metering procedure using cylinder stroke pipettes

摘要

The device has a tubular actuator (9) designed for generating excitation angular frequency in a specific range. A pipette tip (2) of a piston-stroke pipette is designed as a part of a Helmholtz-resonator (13). The tip has a neck-shaped section (2c) with a pipette neck length (L), where the section opens into a pipette tip opening (2d) with a cross-sectional area. The tip and the pipette form a common volume (V). A control device (11) detects a change of resonance angular frequency of the resonator. An independent claim is also included for a method for detecting pipette volume and/or immersion of piston-stroke pipette into liquid.