The Siemens 6DR5225-.....-.... is a SIPART PS2 smart electropneumatic positioner accepting a 4-20 mA (3/4-wire) HART input, housed in a flameproof aluminum Ex d enclosure, and configured for double-acting pneumatic linear or part-turn actuators.
Supplied as a single piece (packaging quantity 1). The kit includes the positioner with the Ex d aluminum enclosure; no mounting bracket, air tubing, or cable gland is listed as included — verify the full accessory pack against your actuator's interface before the job lands.