Liquid transfer between rotating modules

Apparatus for transferring liquid between modules rotating around a rotation axis, comprising:

• a fluidic module comprising a fluid opening oriented in a first direction and fluidically connected to fluidic structures in the fluidic module, wherein the first direction corresponds to a first axial direction with respect to the rotation axis or comprises an angle of <90° to the first axial direction;
• a transfer module comprising a transfer opening oriented in a second direction, wherein the second direction corresponds to a second axial direction with respect to the rotation axis that is opposite to the first axial direction or comprises an angle of <90° to the second axial direction, wherein the transfer module is configured to dispense or receive liquid through the transfer opening;
• a first drive configured to effect a rotation of the fluidic module to move the fluid opening along a circular path around the rotation axis;
• a second drive configured to effect a rotation of the transfer module to move the transfer opening along a circular path around the rotation axis;
• and
• a control configured to synchronize the rotation of the fluidic module and the rotation of the transfer module to position the fluid opening and the transfer opening relative to each other to allow liquid transfer between the transfer opening and the fluid opening during the rotations.