Abstract: A compressed air-driven tool having an electromagnetically operated control element (27) for controlling a pneumatic control circuit in order to maintain a load-independent torque at a constant rotational speed. The tool includes a principal valve (5), which arranged in a drive housing (1) in a manner displaceable by the supplied compressed air against the force of a helical spring (13), and a generator (43), which is mounted on the shaft (49) of a turbine wheel (51). The rotational speed of the shaft (49) is measured with a speed sensor (75) and the supply of compressed air to the principal valve (5) is controlled in the event of a drop in rotational speed as a consequence of a load.

Abstract: The invention relates to a device (200) for the optical characterization of fluids and/or objects enclosed therein in a microchannel (13), comprising a measuring cell (10, 120), wherein the microchannel (13) is guided through the measuring cell (10, 120), characterized in that the measuring cell (10, 120) is filled with a liquid (14), the microchannel (13) is located within the measuring cell (10, 120) in the fluid (14), the fluid and/or objects enclosed therein are movable in the microchannel (13), and the microchannel (13) is movable within the measuring cell (10, 120) and/or the measuring cell (10, 120) with the microchannel (13) is movable manually or automatically. The invention further relates to a measuring cell (10, 120) for the device (200) and methods for optical characterization of fluids and/or objects enclosed therein in a microchannel (13) by means of the device (200).

Abstract: A compressed air-driven tool having an electromagnetically operated control element (27) for controlling a pneumatic control circuit in order to maintain a load-independent torque at a constant rotational speed. The tool includes a principal valve (5), which arranged in a drive housing (1) in a manner displaceable by the supplied compressed air against the force of a helical spring (13), and a generator (43), which is mounted on the shaft (49) of a turbine wheel (51). The rotational speed of the shaft (49) is measured with a speed sensor (75) and the supply of compressed air to the principal valve (5) is controlled in the event of a drop in rotational speed as a consequence of a load.