Patent ID: 8245586

Claim:
A pipetting apparatus for aspiration and dispensation of a metering fluid with the aid of a work fluid that differs from the metering fluid, the work fluid being accommodated in a work space with a variable volume that extends along a channel axis and is formed by a piston-cylinder system at least along an axial section of the channel axis, the piston-cylinder system having a cylinder that delimits the work space along a cylinder section in the radial direction and a piston that delimits the work space in a first axial direction, the cylinder and the piston being arranged so that the piston and the cylinder are capable of moving with respect to each other such that the piston-cylinder system has an axial longitudinal end region for metering, which is open for aspiration and dispensation, and an axial longitudinal end region for work which is closed by the piston, the piston being an outer piston that surrounds the cylinder on the outside in the axial longitudinal end region for work of the piston-cylinder system, wherein the piston accommodates a sensor that is configured to acquire at least one state variable of the work fluid.