Electronic positioner with actuator controlling safety functions for electric actuators of ST 5100 series  
•       Intelligent 3--step controller fitted in the actuator
•       Input 4..20mA / Output 4..20mA (max. 500Ω)
galvanic isolated / relay outputs for motor
•      Input keys for manual operation
•      Automatic adaptation to valve stroke
•      Automatic stroke limit without limit switches
•      Closing tight function / Command control
•      Automatic "switch off function" at blockage
•      Characteristic adaptation