Pipetting device

Pipetting device (1) for receiving and dispensing volumes of fluid, comprising

• a displacer device (3) having a piston/cylinder arrangement, with a displacer piston, and a displacer cylinder,
• a setting means (12) which can be manually operated by a user for setting a pipetting volume of the pipetting device (1), the setting means (12) being rotatable about a longitudinal axis (L) of the pipetting device for setting the pipetting volume,
• a stop (13, 14), the position of which is adjustable and determines a stroke of the displacer piston (4), the pipetting volume being defined by the stroke of the displacer piston (4), and
• a coupling device (16) coupled to the setting means (12) for coupling the setting means (12) to the stop (13, 14),
• wherein the coupling device (16) is coupled or can be coupled to the stop (13, 14) in such a way that a rotation of the setting means (12) causes a change in the position of the stop (13, 14) by means of the coupling device (16), so that the stroke of the displacer piston (4) and thus the pipetting volume is changed,
• wherein the pipetting device (1) has a protective mechanism (19) for limiting a torque and/or force transmission from the setting means (12) to the coupling device (16), so that below a threshold value of a torque acting on the setting means (12) and/or a force acting on the setting means (12), the setting means (12) is coupled to the coupling device (16) in such a way that the setting means (12) and the coupling device (16) move together, and above the threshold value, the torque and/or force transmission is reduced or interrupted.