FLOWX Electric Positioner

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SIPART PS2 Positioners

  • Benefits
  • Overview
  • Application
  • Function
  • Design


SIPART PS2 positioners offer decisive advantages:

  • • Simple installation and automatic commissioning(self-adjustment of zero and span)
  • • Simple operation with
  • • Local operation (manual operation) and configuration of the device using three buttons and a user-friendly two-line display Parameterization via SIMATIC PDM
  • • Very high-quality control thanks to an online adaptation procedure
  • • Negligible air consumption in stationary operation
  • • "Tight closing" function (ensures maximum positioning pressure on the valve seat)
  • • Numerous functions can be activated by simple configuring (e. g. characteristic curves and limits)
  • • Extensive diagnostic functions for valve and actuator ( such as electric actuators or pneumatic actuators ).
  • • Only one device version for linear and part-turn actuators
  • • Few moving parts, hence insensitive to vibrations
  • • External non contacting sensor as option for extreme ambient conditions


The SIPART PS2 electro pneumatic positioned is used to control the final control element of pneumatic linear or part-turn actuators. The electro pneumatic positioned moves the actuator to a valve position corresponding to the set point. Additional function inputs can be used to block the valve or to set a safety position. A binary input is present as standard in the basic device for this purpose.


The SIPART PS2 positioner is used, for example, in the following industries:

  • • Chemical/petrochemical
  • • Power stations
  • • Paper and glass
  • • Water, waste water
  • • Food and pharmaceuticals
  • • Offshore plants

The SIPART PS2 positioner is available:

  • • For single-acting actuators: In Makrolon, stainless steel or aluminum enclosure, as well as flameproof aluminum enclosure (Ex d)
  • • For double-acting actuators: In Makrolon enclosure, stainless steel enclosure and flameproof aluminum enclosure (Ex d)
  • • For non-hazardous applications
  • • For hazardous applications in the versions
  • • Type of protection intrinsic safety "Ex i"
  • • Type of protection flameproof enclosure "Ex d" in flameproof aluminium enclosure
  • • Type of protection non-sparking "Ex nA", dust protection with "Ex t" enclosure


The SIPART PS2 positioner works in a completely different way to normal positioners.

Mode of operation

Comparison of the setpoint and the actual value takes place electronically in a microcontroller. If the microcontroller detects a deviation, it uses a 5-way switch procedure to control the piezoelectric valves, which regulates the flow of air into and from the chambers of the pneumatic actuator or blows it in the opposite direction.

The microcontroller then outputs an electric control command to the piezoelectric valve in accordance with the size and direction of the deviation (deviation between setpoint and actual values).

The piezoelectric valve converts the command into a pneumatic positional increment.

The positioner outputs a continuous signal in the area where there is a large system deviation (high-speed zone); in areas of moderate system deviation (slow-speed zone) it outputs a sequence of pulses. No positioning signals are output in the case of a small system deviation (adaptive or variable dead band). The linear or rotary motion of the actuator is detected by the mounting kit and transferred to a high-quality potentiometer over a shaft and a non-floating gear transmission.


The SIPART PS2 positioner is a digital field device with a highly integrated microcontroller. The positioner consists of the following components:

  • • Enclosure and cover
  • • PCB with corresponding electronics with or without communication through HART or with electronics for communication in accordance with
  • • PROFIBUS PA specification, IEC 61158-2; bus-supplied device, or
  • • FOUNDATION Field bus (FF) specification, IEC 61158-2, bus-supplied device
  • • Position detection system
  • • Terminal housing with screw terminals
  • • Pneumatic valve manifold with piezoelectric valve pre control.
  • • Paper and glass
  • • Water, waste water
  • • Food and pharmaceuticals
  • • Offshore plants

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  • electro pneumatic positioner, function diagram
  • Dimensional drawings
  • Mounting kit for NAMUR part-turn actuators