Non-invasive measurement system

摘要

A non-invasive piston-cylinder measurement system of a cylinder and a piston mounted for axial movement within the cylinder. The cylinder comprises a non-magnetic cylinder wall. A magnet is mounted within the piston. A plurality of magnetically activated switches, such as read switches, is mounted outside of the non-magnetic cylinder wall so as to be activated by piston movement. The measurement system provides a non-invasive means for measuring fluid extruded from a piston-cylinder extruder.