Magnetic field sensors are activated by magnetic fields and are especially suited for piston position detection in pneumatic cylinders. Based on the fact that magnetic fields can permeate non-magnetizable metals, it is possible to detect a permanent magnet attached to the piston through the aluminium wall of the cylinder. Magnetic-inductive permaprox sensors from TURCK operate on a patented function principle. Thus they are capable of reliably detecting permanent magnets of various field strengths on all common cylinder types. They operate completely wear-free and are short-circuit protected; a weld-field immune version for welding applications is also available.
