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Positioners from SIEMENS, PMV and BÜRKERT

Fergo supplies electropneumatic positioners from SIEMENS, PMV and BÜRKERT. Digital positioning for pneumatic quarter-turn and linear actuators, 4–20 mA / 0–10V, HART, Profibus, ATEX, IP66/67.

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Product Overview

Positioners – SIEMENS SIPART PS2, PMV and BÜRKERT for Pneumatic Actuators

The positioner continuously compares the analogue setpoint signal (4–20 mA or 0–10V) with the actual position of the pneumatic actuator and adjusts the air pressure accordingly. The control valve consequently achieves precise and reproducible positioning across the full stroke range. The positioner converts an electrical signal into a proportional pneumatic pressure and forms the interface between the supervisory control system (PLC/DCS) and the pneumatic actuator. Mounting follows IEC 60534-6 directly on the actuator.

Fergo offers three leading positioner brands. The SIEMENS SIPART PS2 is a digital electropneumatic positioner for quarter-turn and linear actuators with automatic self-tuning, HART communication, optional Profibus PA and Foundation Fieldbus, IP66/67 and ATEX certification. The PMV digital positioner provides a compact design with precise positioning, HART protocol, automatic calibration and a robust aluminium housing for demanding industrial environments. The BÜRKERT digital positioner features innovative control algorithms, high durability, a compact form factor and modular expandability.

These positioners are designed for chemical processing, petrochemicals, power generation, water treatment, food processing, pharmaceuticals and HVAC systems. For combination with pneumatic quarter-turn actuators and NAMUR solenoid valves, Fergo furthermore delivers fully pre-assembled control valve packages.

Positioner Brands at Fergo

01 SIEMENS SIPART PS2

The SIEMENS SIPART PS2 is the world’s most widely installed digital electropneumatic positioner. Automatic self-tuning determines optimal control parameters during commissioning without manual intervention. HART communication enables remote configuration and diagnostics via the 4–20 mA signal. Profibus PA and Foundation Fieldbus are optionally available. IP66/67 protection and ATEX certification (Zone 1/2, Zone 21/22) consequently qualify the SIPART PS2 for use in hazardous areas. The aluminium housing is corrosion-resistant coated. Numerous optional modules such as limit switches, solenoid valve blocks and pressure sensors are furthermore retrofittable.

02 PMV Digital Positioner

The PMV digital positioner provides a compact and robust solution for pneumatic quarter-turn and linear actuators. Automatic calibration and an intelligent control algorithm ensure precise positioning with short response times. The HART protocol enables remote diagnostics and parameterisation. The aluminium housing with IP66 protection is designed for demanding industrial environments. The PMV positioner is consequently the cost-effective alternative for applications requiring high control accuracy in a compact package.

03 BÜRKERT Digital Positioner

The BÜRKERT digital positioner features innovative control algorithms that ensure exact positioning even under challenging process conditions. The modular design allows integration of additional function modules such as feedback signals, limit switches and communication interfaces. The compact form factor reduces the space requirement on the actuator. The durability and low maintenance consequently make the BÜRKERT positioner the preferred choice for process plants with high availability requirements in chemical, pharmaceutical and food industries.

Materials in detail

Operating Principle and Technical Features of the Positioners

1. Input and Output Signals

Input signal: analogue setpoint signal 4–20 mA or 0–10V from the PLC or DCS.
Output signal: proportional pneumatic pressure to drive the actuator. Single-acting (SR) actuators receive one pressure signal; double-acting (DA) actuators receive two opposing pressure signals.
Feedback: analogue position signal 4–20 mA back to the control system. All three brands furthermore support the HART protocol for digital communication over the analogue loop.

2. Automatic Self-Tuning (Autotune)

Application: initial commissioning and recalibration for all three brands.
Advantages: the positioner automatically drives the actuator to both end positions, determines stroke time, dead band, friction and optimal control parameters. Manual tuning is consequently not required. Commissioning time is significantly reduced.
Limitations: under extreme process conditions (very high friction, unstable air supply), manual fine-tuning may additionally be required.

3. Communication Interfaces

HART: available on SIEMENS, PMV and BÜRKERT. Enables remote configuration, diagnostics and parameter readout via the existing 4–20 mA wiring.
Profibus PA / Foundation Fieldbus: optionally available on the SIEMENS SIPART PS2 for full digital integration with the control system.
All three systems consequently enable integration into asset management systems for predictive maintenance and diagnostics.

4. Protection and ATEX Certification

Protection: IP66/67 on all three brands for use in dusty and wet environments.
ATEX: the SIEMENS SIPART PS2 is certified per the ATEX Directive 2014/34/EU for Zone 1/2 (gas) and Zone 21/22 (dust). PMV and BÜRKERT also offer ATEX versions for selected models.
Limitations: ATEX versions require project-specific engineering and ordering.

5. Mounting per IEC 60534-6 / NAMUR

Application: direct mounting on pneumatic linear and quarter-turn actuators.
Advantages: the standardised mounting interface per IEC 60534-6 and NAMUR ensures compatibility with actuators from various manufacturers. Mounting kits for the most common actuator types are furthermore available from Fergo stock.
Limitations: for non-standard actuator interfaces, a custom mounting kit is required.

Certifications and Standards of Fergo Positioners

Fergo positioners comply with the key European and international standards for process automation. Mounting follows IEC 60534-6 and the NAMUR standard. IP66/67 protection complies with EN 60529. The SIEMENS SIPART PS2 is certified per the ATEX Directive 2014/34/EU. CE marking confirms conformity with EMC Directive 2014/30/EU. SIL classification (Safety Integrity Level) is available on selected models.

Factory certificates, technical datasheets and configuration guides are available on the Fergo certificates page. For selecting the right positioner, the technical advisory team supports the selection.

Delivery and Availability of Positioners

Fergo offers positioners from SIEMENS, PMV and BÜRKERT from stock in Neuss, Germany. Shipping covers the UK, Europe and worldwide. Standard delivery via DHL is 2–7 working days. All terms are detailed on the shipping and payment terms page.

For projects requiring a pre-assembled control valve with actuator, solenoid valve, positioner and limit switch box, Fergo develops customised solutions — Plug-and-Play. The technical team supports every enquiry from specification to delivery of the ready-to-operate unit.