Siemens SIPART PS2 Series Technical Description page 3

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Overview
SIPART PS2 electropneumatic positioner
SIPART PS2 EEx d electropneumatic positioner in flameproof casing
SIPART PS2 in stainless steel casing
The SIPART PS2 electropneumatic positioner is used to control
the final control element of pneumatic linear or part-turn actua-
tors. The electropneumatic positioner moves the actuator to a
valve position corresponding to the setpoint. 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.
© Siemens AG 2008
Electropneumatic positioners
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Benefits
SIPART PS2 positioners offer decisive advantages:
• Simple installation and automatic commissioning (self-adjust-
ment of zero and span)
• Simple operation with
- Local operation and configuration of the device using three
input keys and a user-friendly two-line LCD
- Programming through SIMATIC PDM
• Very high-quality control thanks to an online adaptation proce-
dure
• Negligible air consumption in stationary operation
• "Tight shut-off" function (ensures maximum positioning pres-
sure on the valve seat)
• Numerous functions can be activated by simple configuring
(e.g. characteristics and limits)
• Extensive diagnosis functions for valve and actuator
• Only one device version for linear and part-turn actuators
• Few moving parts, hence insensitive to vibrations
• External non-contacting position sensor as option for extreme
ambient conditions
• "Intelligent solenoid valve": Partial Stroke Test and solenoid
valve function in a single device
• Partial Stroke Test e.g. for safety valves
• SIL (Safety Integrity Level) 2
• Can also be operated with natural gas
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Application
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-action actuators: in plastic, stainless steel or alumi-
num casings, as well as flameproof aluminium casing (EEx d)
• For double-action actuators: in plastic and stainless steel cas-
ing, as well as flameproof aluminum casing (EEx d)
• For non-hazardous applications
• For hazardous applications in the designs
- as intrinsically-safe device (EEx ia/ib) or
- in flameproof aluminum casing (EEx d) or
- in EEx n design (non sparking)
and in the versions:
• 0/4 to 20 mA control communication without/with communica-
tion through HART signal
• With PROFIBUS PA communication interface
• With FOUNDATION Fieldbus (FF) communications interface.
Explosion-proof versions
The basic version of the device is available in an intrinsically-
safe design with degree of protection EEx ia/ib or in a design
with approval for zone 2/zone 22 (dust).
Operation in zone 1 is permitted when enclosed in the flame-
proof casing version SIPART PS2 EEx d. (see "Technical Data").
It is then permissible to use all option modules (except external
actuator travel detection systems, SIA module, limit value con-
tact module and NCS).
SIPART PS2
Technical description
Siemens FI 01 · 2009 6/3
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