Data Sheet T 8394 EN
Associated Information Sheet T 8350
Edition June 2014
Fig.3: Type 3725, attachment to rotary actuators
according to VDI/VDE3845
Fig.2: Type 3725, attachment
to Type 3372 Actuator
Fig.1: Type 3725, direct
attachment to
Type3277 Actuator
The positioner ensures a predetermined assignment of the
valve (controlled variable x) to the input signal (reference vari-
able w). It compares the input signal received from a control
system to the travel or rotational angle of the control valve
and issues a corresponding output signal pressure (output
variable y).
Special features
• Simple direct attachment to SAMSON Type 3277 Actuator
(120 to 700cm², see Fig.1)
• Attachment according to IEC 60534-6 (NAMUR)
• Attachment to rotary actuators according to VDI/
VDE3845 (see Fig.3)
• Attachment to Type3372 Actuator for Series V2001
Valves (see Fig.2)
• Easy operation with intuitive navigation menu using three
capacitive keys
• LCD easy to read in any mounted position due to select-
able reading direction
• Variable, automatic start-up
• Preset parameters (only values deviating from the standard
need to be adjusted)
• Permanent storage of all parameters in EEPROM (protect-
ed against power failure)
• Two-wire system with a small electrical load of 300Ω
• Activatable tight-closing function
• Continuous monitoring of zero point
• Non-contact position sensing
• Unaffected by environmental effects and steam hammering
Version
– Electropneumatic postioner with local operation and LCD
– Type3725-000, without explosion protection
– Type3725-110, explosion protection according to
ATEX
– Type3725-113, explosion protection according to
GOST
– Type3725-130, explosion protection according to CSA
Series3725
Type3725ElectropneumaticPositioner
Application
Single-acting positioner for attachment to pneumatic linear
and rotary valves. Self-calibrating, automatic adaptation to
valve and actuator.
Referencevariable 4to20mA
Travel 3.75 to 50 mm
Openingangle 24to100°
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