Sample processing system for processing biological samples

The invention relates to a sample processing system and method for processing biological samples, comprising a sample processing device having: an receiving plate which is arranged substantially horizontally in a plane defined by a first and second direction, first and second working arms which can move relative to the receiving plate, preferably along a first edge of the receiving plate in the first direction and extend substantially parallel to each other in the second direction over the receiving plate, a control device, a plurality of sample container, and a plurality of pipetting tips, wherein at least one pipetting device is mounted on the first working arm and is moveable in the second direction and in a third direction; at least one gripping device is mounted on the second workingarm and is moveable in the third direction; grippers provided on the gripping device can be rotated around a gripper axis of rotation parallel to the third direction; and the control device is configured to mix the liquid sam