The 6DR5216-.....-.... is a Siemens SIPART PS2 smart electropneumatic positioner, accepting a 4-20 mA (3/4-wire) HART input signal. It is single-acting, housed in a stainless steel flameproof (Ex d) enclosure, and designed for pneumatic linear and part-turn actuators. This positioner is classified as NRND (Not Recommended for New Designs) per the manufacturer's lifecycle status, meaning it remains available for existing installations but is no longer the recommended choice for new projects.
Fit and Application Notes
The 4-20 mA HART loop is the primary control signal; the positioner is single-acting, so it drives one direction pneumatically and relies on a spring return. The Ex d flameproof enclosure (SST) is suited for hazardous areas where explosive atmospheres may be present. Group code R3P2 and product group 4759 are internal Siemens classifications used for ordering and logistics; they do not affect functional fit.