The Siemens 6DR5116-.....-.... is a SIPART PS2 smart electropneumatic positioner built for 4-20mA HART control of pneumatic linear and part-turn actuators. It comes in a stainless steel flameproof enclosure (Ex d), single-acting, and includes non-contacting (wear-free) position detection (NCS). This is the version without the pressure sensor option P01/P02. The Group Code is R3P2 and the Product Group is 4759 — these are internal Siemens cataloging codes that help with cross-referencing in their ordering systems, not functional specs.
The 4-20mA HART loop powers the positioner and carries the digital communication — no separate supply needed. The Ex d stainless steel enclosure is rated for hazardous locations (flameproof), so it mounts directly in Zone 1 or Div 1 areas without an additional purge or barrier, provided the wiring meets the installation standard. Single-acting means it drives a spring-return actuator; for double-acting actuators you'd need the twin-output variant. Non-contacting position detection (NCS) eliminates mechanical wear on the feedback sensor — no linkage to wear out, which is a real advantage on high-cycle or modulating service where a potentiometer would drift over time. The pressure sensor option (P01/P02) is not included here, so if you need internal pressure sensing for diagnostics, this isn't the right variant.