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.
What the ratings mean for fit
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.