The Siemens 6DR5120-0NM01-0AA0 is a SIPART PS2 2L electropneumatic positioner with HART, built for single-acting valve actuators and delivered in a plastic, non-explosion-proof housing. HART communication is supported on the SIPART PS2 2L. Single-acting means it drives one side of a spring-return cylinder or diaphragm actuator; the spring provides the return stroke. Ensure your actuator matches — a double-acting unit needs a different positioner variant.
Lead time is typically several weeks; plan spares accordingly.