SIPART PS2 Smart, electropneumatic positioner, 4...20mA, Ex/nEx, single-acting, polycarbonate enclosure, for pneumatic linear and part-turn actuators. Non-contacting (wear-free) position detection (NCS). Standard Without explosion protection. Connection thread el.: 1/2" NPT / pneu.: 1/4" NPT Without limit monitor. Without option module. . Brief instructions Spanish / French / Italian. Standard / Fail-Safe - Depressurizing the actuator in case of failure of electrical auxiliary power (single acting only). Without Manometer block / Booster.