Method for checking the state of a pipette, pipetting method, pipetting device, and suction tube for a pipetting device

摘要

The invention relates to a method for checking the state of a pipette comprising a suction tube and a pipette tip. According to the invention, an ultrasound is coupled into the wall of the suction tube, and the damping of the ultrasound signal is measured as a function of frequency. By comparing the measured frequency-dependent damping to at least one reference measurement or a calibration curve based on reference measurements, it is determined whether the pipette is in a functional condition, and/or whether the pipette contains or contacts fluid. The invention further relates to a pipetting method using the method for checking a pipette state according to the invention, a suction tube arrangement for a pipetting device for pipetting fluid, and a pipetting device that can be used to perform the methods according to the invention.