SIPART PS2 smart electropneumatic positioner for pneumatic linear and part-turn actuators; 2-wire; 4…20mA with HART-interface; double action; Enclosure Aluminium Standard Without explosion protection. Connection thread el.: 1/2″ NPT / pneu.: 1/4″” NPT Without limit monitor. Without option module. . Brief instructions English / German / Chinese. Standard / Fail-Safe – Depressurizing the actuator in case of failure of electrical auxiliary power (single acting only). Without Manometer block / Venting gauge block / Booster.