Siemens SIPART PS2 smart electro-pneumatic is a great positioner for linear and part turn actuators. This positioner works using compressed air as auxiliary power and features a dual clutch with a switchable gear and has a 'fail-in-place' function. Fail-in-place will hold the correct position of the actuator if there is an electrical or auxiliary power fail.
Position controller for single-acting drives
For linear and rotary actuators
Very high control quality
Easy to assemble and set up
Plastic case
Optional accessory modules