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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 

(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

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°

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