The Siemens 6DR5022-.....-.... is a SIPART PS2 smart electropneumatic positioner built for modulating control of pneumatic linear and part-turn actuators. It takes a 4-20 mA input signal and drives the actuator to position, with double-acting output for spring-return or double-acting cylinders. The stainless steel enclosure and non-contacting (wear-free) position detection (NCS) mean it holds up in washdown or corrosive environments where a plastic housing would be a recurring replacement. This is the variant without the local display window, so setup and monitoring happen over the HART loop or via the optional digital interface.
The 4-20 mA input is the universal analog control signal—any DCS or PLC with an analog output card can drive it. Double-acting output means it pressurizes one side of the actuator while venting the other, which is the right match for double-acting cylinders and spring-return actuators that need positive pressure in both directions. The stainless steel enclosure (SST) and NCS (non-contacting sensor) are the two features that decide whether this part survives the route: the SST resists corrosion from washdown chemicals or salt spray, and the NCS eliminates the mechanical linkage that wears out on valve stems in high-cycle service. If the application has vibration or frequent stroking, the wear-free feedback is worth the premium over a contact-based positioner.