Robust housing (wall thicknesses up to 5mm) made of seawater-resistant aluminium AlMgSi1 - Stainless steel versions (1.4305 or 1.4404) as option - A common drive shaft (measuring axis) and ball bearing with shaft sealing ring - Rotor with shaft, gear and permanent magnets mounted in prechamber - Magnetic sensor elements - Detection of revolutions by absolute multi-turn gear - Redundant design (sensor, electronics and power supply), d.h. 2 autarkic nodes - The construction corresponds to category 3 according to DIN EN ISO 13849 - Protection class IP 69K (option: encapsulated housing) - Electrical connection via two connectors M12x1, 5-pin, A-coded or cable.