SIPART PS2 smart electropneumatic positioner for pneumatic linear and part-turn actuators; 2-wire; 4...20mA; single action; polycarbonate enclosure Standard Type of protection (Ex): Intrinsic safety (Ex i). Output isolator SITRANS I200 separately orderable (7NG4131-1AA00). 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). Manometer block aluminum ¼‑18 NPT, single-acting with plastic manometer IP31 (MPa, psi)