| 摘要 |
<p>A method of identifying a blockage at the receiving opening of a pipetting needle which at or in the proximity of the receiving opening has an electrode (E1) or is itself in the form of an electrode (E1), in an analysis apparatus when taking liquid from a liquid-containing vessel and/or when delivering liquid into a liquid-containing vessel, in which the pipetting needle is displaced in such a way that the receiving opening is immersed in the liquid in the liquid-containing vessel, an amount of liquid is sucked up into the pipetting needle or delivered from the pipetting needle, the pipetting needle is further displaced in such a way that the receiving opening comes out of the liquid in the liquid-containing vessel, during the displacement of the pipetting needle the capacitances (Kmeasurement) between the electrode (E1) and a counter-electrode (E2) are detected in dependence on the position of the pipetting needle, the detected capacitances (Kmeasurement) are compared to predetermined reference values (Kreference) for the respective position of the pipetting needle, and information about the presence of a blockage at the receiving opening of the pipetting needle is delivered if the deviation between the detected capacitances (Kmeasurement) and the predetermined reference values (Kreference) at one position or a plurality of positions of the pipetting needle exceeds a predetermined threshold value.</p> |
