Turck India Automation Pvt. Ltd. Manufactures Magnetic Field Sensors for Piston Position Monitoring. Turck India Automation Pvt. Ltd. Manufactures Industrial Automation, Electronic Components, Sensors, Interfaces, and Fieldbuses. The Magnetic Field Sensors for Piston Position Monitoring are activated by magnetic fields and are especially suited for piston position monitoring in pneumatic cylinders. The Magnetic Field Sensors for Piston Position Monitoring are capable of reliably detecting permanent magnets of various field strengths on all common cylinder types. Based on the fact that magnetic fields can permeate non-magnetic metals, it is possible to detect a permanent magnet attached to the piston through the aluminium wall of the cylinder.