Siemens SIPART is the electropneumatic positioner product line used to control pneumatic linear and part-turn actuators in process plant environments. SIPART PS2 positioners translate a 4-20 mA control signal into precise pneumatic output to position control valves, butterfly valves, and rotary actuators, and are found throughout oil and gas, chemical, petrochemical, water treatment, and power generation facilities. Because SIPART PS2 positioners are installed directly on process valves, a failed positioner removes that valve from automatic control. In continuous process operations, a manual workaround can disrupt process stability or require a partial shutdown until a replacement is sourced. Lead times through OEM channels for specific SIPART configurations can be extended, particularly for units with explosion protection or HART communication options.
PLC Direct supplies Siemens SIPART PS2 hardware to customers for maintenance and component replacement in existing SIPART PS2 installations. Our collection covers single-acting and double-acting positioners across multiple enclosure and communication configurations, along with SIPART PS2 accessories and replacement components.
Where Siemens SIPART PS2 Positioners Are Used
SIPART PS2 positioners are deployed wherever precise pneumatic valve positioning is required, particularly in facilities with safety classification requirements or hazardous area designations.
Facilities and industries that rely on Siemens SIPART PS2 positioners include:
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Oil and gas production, refining, and pipeline facilities requiring Ex-rated valve control
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Chemical and petrochemical plants with hazardous area zone classifications
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Power generation facilities with continuous steam and water flow control requirements
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Water and wastewater treatment plants managing pump and valve sequencing
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Pulp and paper operations with high-cycle valve positioning demands
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Pharmaceutical and specialty chemical manufacturing with tight process control tolerances
Siemens SIPART PS2 Products
The SIPART collection at PLC Direct covers electropneumatic positioners in single-acting and double-acting configurations, with nEx and explosion-protected variants, along with accessories and spare parts for the SIPART PS2 family. All product families and part number references below are confirmed on the live PLC Direct collection page.
Product Families
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SIPART PS2 nEx Positioners (4-20 mA, single-acting): Electropneumatic positioners for pneumatic linear and part-turn actuators. 4-20 mA input (3/4-wire), polycarbonate enclosure, with Fail-Safe behavior that depressurizes the actuator on loss of electrical supply. Available in nEx and Ex/nEx configurations. Part numbers including 6DR5310-0NG00-0AA0 (non-Ex, M20x1.5 electrical connection, G 1/4 pneumatic) are confirmed in the collection.
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SIPART PS2 HART Positioners (Ex/nEx, single-acting): SIPART PS2 variants with HART communication in addition to 4-20 mA control, providing two-wire compatibility and intrinsic safety (Ex i) explosion protection. Connection threads in 1/2" NPT (electrical) and 1/4" NPT (pneumatic). Part number 6DR52100EN000AA0 is confirmed available.
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SIPART PS2 Double-Acting Positioners with NCS: Double-acting positioner variants using non-contacting (wear-free) position detection (NCS technology). Suited for double-acting pneumatic actuators requiring position feedback without mechanical contact wear. Part number 6DR5020-0NN00-0AA0 is confirmed in stock.
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SIPART PS2 Accessories and Spare Parts: Replacement and add-on components for installed SIPART PS2 units:
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Pneumatic block, single-acting, for SIPART PS2 6DR5.1x series (C73451-A430-D80)
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Potentiometer assembly for SIPART PS2 (C73451-A430-D84)
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Iy module (plug-in analog current output, 4-20 mA position feedback, Ex ib rated) for SIPART PS2 (6DR4004-6J)
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Available at PLC Direct
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SIPART PS2 nEx positioners, single-acting, 4-20 mA, polycarbonate enclosure, M20x1.5/G 1/4 (6DR5310-0NG00-0AA0)
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SIPART PS2 HART Ex/nEx positioners, single-acting, intrinsic safety, 1/2" NPT/1/4" NPT (6DR52100EN000AA0)
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SIPART PS2 double-acting positioners with non-contacting NCS position detection (6DR5020-0NN00-0AA0)
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Pneumatic blocks for SIPART PS2 6DR5.1x series (C73451-A430-D80)
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Potentiometer assemblies for SIPART PS2 (C73451-A430-D84)
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Iy plug-in modules for 4-20 mA position feedback with Ex ib protection (6DR4004-6J)
What to Know Before You Buy Siemens SIPART PS2 Parts
Ordering the correct SIPART PS2 positioner or accessory requires matching three key variables: actuation type (single-acting or double-acting), connection thread standard, and explosion protection classification. Getting these wrong will result in a positioner that cannot be installed in the target application.
Hardware condition options: We supply SIPART PS2 positioners and accessories as surplus sealed, refurbished, and used hardware. Surplus sealed units are factory-sealed stock. Refurbished units have been tested and restored to operational condition.
Actuation type: Single-acting positioners depressurize the actuator on loss of electrical supply (Fail-Safe). Double-acting positioners control both the supply and exhaust sides of a double-acting actuator independently. These are not interchangeable in the field.
Connection threads: SIPART PS2 positioners are available in metric (M20x1.5 electrical, G 1/4 pneumatic) and NPT (1/2" NPT electrical, 1/4" NPT pneumatic) thread standards. Confirm the thread standard used at the installation site before ordering.
Explosion protection: SIPART PS2 positioners are available in nEx (Zone 2/Category 3), Ex/nEx (combined Zone 2 and intrinsic safety), and Ex i (intrinsic safety) configurations. Verify the hazardous area classification at the installation before selecting a positioner variant.
Lifecycle status: Several SIPART PS2 models in the collection carry cancellation status, including 6DR5310-0NG00-0AA0. These models are no longer available through standard OEM channels, making independent supply the primary sourcing path for maintenance teams managing installed SIPART PS2 valves.
Warranty: All SIPART PS2 hardware purchased from PLC Direct includes a standard 1-year warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.





















