The Siemens 6DR5626-.....-.... is a SIPART PS2 smart electropneumatic positioner with FOUNDATION Fieldbus communication, double-acting output, and a stainless steel flameproof (Ex d) enclosure rated for hazardous-area pneumatic linear and part-turn actuators. RoHS compliant since 31-12-16 and REACH candidate-list declared, which covers the documentation a compliance audit or incoming inspection will request.
Because it is a C-class product (manufactured to order), lead time is driven by the build queue rather than warehouse availability; an RFQ with your required delivery window is the right way to commit the BOM line. The group code R3P2 and product group 4759 are the internal Siemens classification tags — useful for cross-referencing against a legacy parts list or a spare-parts catalog lookup.
What the key specs mean for fit
Double-acting output means this positioner drives both directions of a pneumatic actuator — it is the right variant for a double-acting cylinder or a rotary vane, not a spring-return single-acting unit. The flameproof Ex d enclosure (SST) is built for Zone 1 / Zone 2 gas groups; the stainless steel body adds corrosion resistance for offshore or chemical-process environments where painted aluminum would degrade. FOUNDATION Fieldbus communication ties directly into a FF segment — no protocol converter needed — but the bus power and segment coupler must be sized to include this device's draw.