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Samson 3725 Electro-pneumatic Valve Positioner

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  • Operation: Linear or rotary

  • Display: Alphanumeric LCD

  • Features: Auto calibration & tuning.

  • Travel/Rotation: 50mm or 100o

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  • 3725

  • Samson

Samson 3725 Electropneumatic Positioner Introduction

3725 Electropneumatic Positioner is mounted on pneumatic control valves and is used to assign the valve position (controlled variable x) to the control signal (reference variable w). The positioner compares the electric control signal of a control system to the travel or opening angle of the control valve and issues a signal pressure (output variable y) for the pneumatic actuator.

Operation A user-friendly, intuitive concept using three capacitive keys and an LCD has been developed: users select parameters by

touching the arrow keys and confirm the settings with the confirmation key. In the menu, all parameters are listed in one level,

meaning there is no need to search through submenus. All parameter settings can be read and changed on site. The menu is ices in hazardous areas.


Samson 3725 Electropneumatic Positioner Feature


  • Electropneumatic positioner

  • Housing of polyphthalamide

  • Attachment to linear actuators according to IEC 60534-6 or SAMSON integral attachment

  • Attachment to rotary actuators according to VDI/VDE 3845

  • Attachment to double-acting actuators with Type 3710 Reversing Amplifier

  • Easy operation with intuitive navigation menu using three capacitive keys

  • Easy-to-read display in any mounting position thanks to rotatable reading direction

  • Variable automatic start-up

  • Preset parameters

  • All parameters saved in non-volatile EEPROM

  • Tight-closing function can be activated

  • Automatic zero monitoring

  • Non-contact position sensing

  • Unaffected by environmental effects and steam hammering

Samson 3725 Electropneumatic Positioner Specification 


Type 3725 Positioner

Travel, adjustable

Direct attachment to Type 3277 Actuator: 3.75 to 30 mm Attachment acc. to IEC 60 534-6-1 (NAMUR): 3.75 to 50 mm Attachment to Type 3372 Actuator: 15/30 mm

Attachment to rotary actuators: 24  to 100°

Reference variable w

Signal range

4 to 20 mA · Two-wire device with reverse polarity protection

Split range operation

4 to 11.9 mA and 12.1 to 20 mA

Static destruction

limit

±33 V

Minimum current

3.8 mA

Load impedance

Š 6 V (corresponds to 300 fi at 20 mA)

Supply air

Supply pressure

1.4 to 7 bar (20 to 105 psi)

Air quality

acc. to ISO  8573-1 (2001)

Max. particle size and density: Class 4 · Oil content: Class 3

Pressure dew point: Class 3 or at least 10 K below the lowest ambient temperature to be expected

Signal pressure (output)

0 bar up to the capacity of the supply pressure · Can be limited to approx. 2.4 bar by software

Characteristics

3 characteristics for globe valves · 9 characteristics for rotary valves

Hysteresis

Š 0.3 %

Sensitivity

Š 0.1 %

Transit time

< 0.5 s not permissible for initialization, adaptation using volume restriction

Direction of action

w/x reversible

Air consumption

Š 100 ln/h with a supply pressure up to 6 bar and a signal pressure of 0.6 bar

Air output capacity

Actuator pressurized

At Op = 6 bar: 8.5 mn³/h · At Op = 1.4 bar: 3.0 mn³/h · KVmax (20 °C) = 0.09

Actuator vented

At Op = 6 bar: 14.0 mn³/h · At Op = 1.4 bar: 4.5 mn³/h · KVmax (20 °C) = 0.15

Permissible ambient temperature

–25 to +80 °C

Limits in test certificates additionally apply for explosion-protected devices.

Influences

Temperature

Š 0.15 %/10 K

Supply air

None

Vibrations

Š 0.25 % up to 2000 Hz and 4 g according to IEC 770

Electromagnetic compatibility

Complying with the requirements of EN 61000-6-2, EN 61000-6-3, EN 61326-1 and NAMUR Recommendation NE 21

Electrical connections

One M20x1.5 cable gland for 6 to 12 mm clamping  range Cage clamp terminals for 0.2 to 1.5 mm² wire cross-sections

Explosion protection

II 2 G Ex ia IIC T4

Degree of protection

IP 66


-Manuals

Samson 3725 Electropneumatic Positioner

-Data sheet


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