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Series 3725
Type 3725 Electropneumatic Positioner
Application
Single-acting positioner for attachment to pneumatic linear
and rotary valves. Self-calibrating, automatic adaptation to
valve and actuator.
Reference variable
Travel
Opening angle
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 700 cm², see Fig. 1)
• Attachment according to IEC 60534-6 (NAMUR)
• Attachment to rotary actuators according to VDI/
VDE 3845 (see Fig. 3)
• Attachment to Type 3372 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 300 Ω
• 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
–
– Type 3725-000, without explosion protection
– Type 3725-110, explosion protection according to
ATEX
– Type 3725-113, explosion protection according to
GOST
– Type 3725-130, explosion protection according to CSA
Associated Information Sheet
4 to 20 mA
3.75 to 50 mm
24 to 100°
T 8350
Fig. 1: Type 3725, direct
attachment to
Type 3277 Actuator
Fig. 3: Type 3725, attachment to rotary actuators
according to VDI/VDE 3845
Edition June 2014
Data Sheet
Fig. 2: Type 3725, attachment
to Type 3372 Actuator
T 8394 EN
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Related Manuals for Samson 3725-000
Summary of Contents for Samson 3725-000
- Page 1 (output variable y). Special features • Simple direct attachment to SAMSON Type 3277 Actuator (120 to 700 cm², see Fig. 1) • Attachment according to IEC 60534-6 (NAMUR) • Attachment to rotary actuators according to VDI/ VDE 3845 (see Fig. 3)
- Page 2 Principle of operation PD control algorithm in the microprocessor compares this ac- tual position to the 4 to 20 mA control signal after it has been The positioner is mounted on pneumatic control valves and is converted by the A/D converter (3). In case of a system devi- used to assign the valve position (controlled variable x) to the ation occurs, the activation of the i/p converter is changed so control signal (reference variable w).
- Page 3 Table 1: Technical data Type 3725 Positioner Travel (adjustable) Direct attachment to Type 3277 Actuator: 3.75 to 30 mm Direct attachment to Type 2780-2 Actuator: 6/12/15 mm Attachment to Type 3372 Actuator: 15/30 mm Attachment according to IEC 60534-6 (NAMUR): 3.75 to 50 mm Attachment to rotary actuators: 24 to 100°...
- Page 4 M20 x 1.5 M20 x 1.5 62.50 Specifications subject to change without notice SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 T 8394 EN samson@samson.de · www.samson.de...