SISTO-SK-i is a smart actual-position feedback unit for valves with linear actuators. Valve position is indicated visually and clearly by means of cloured LEDs. User-friendly setting of limit positions by automatic initialisation on site or via the process control system. SISTO-SK-i continuously records valve travel and comprises a microcontroller-based analysing unit . Valve position is signalled optically ba the device LEDs and electrically via digital outputs. SISTO-SK-i is connected via an M12 plug connector and is ready for operation as soon as initialisation is complete.