Data Sheet
T 8394 EN
Associated Information Sheet
T 8350
Edition June 2014
Fig. 3:
Type 3725, attachment to rotary actuators
according to VDI/VDE 3845
Fig. 2:
Type 3725, attachment
to Type 3372 Actuator
Fig. 1:
Type 3725, direct
attachment to
Type 3277 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
•
Attachment according to IEC 60534-6 (NAMUR)
•
Attachment to rotary actuators according to VDI/
•
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
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
4 to 20 mA
Travel
3.75 to 50 mm
Opening angle
24 to 100°
