Anagnostics of Linz, Austria, has received US Patent No. 7,927,546, "Device for the analysis of liquid samples." The device includes a rotational-symmetric rotor that is inserted into a sample container. An annular gap is provided between the sample container and the rotor, and the rotor has at least one flow channel for transporting liquids and gases into and from the interior of the sample container. A means for a centered mounting of the rotor is also provided.