Samson 3725 4763 I/P Digital Electro Pneumatic Valve Controller 3730-3 3730-5 3731-3 HART Feedback Diagnosis Valve Positioner
Samson Type 3725 – Compact Electropneumatic Positioner for Pneumatic Valves
Product Overview
The Samson Type 3725 is a single-acting electropneumatic positioner for attachment to pneumatic globe and rotary valves. It is self-calibrating and automatically adapts to the valve and actuator. The device is simple, reliable, and commonly used in process plants where a compact, low-cost positioner is needed for basic control loops. It has a plastic housing (polyphthalamide) and an intuitive LCD with capacitive keys for easy operation.
Features
- Self-calibrating with automatic adaptation to valve/actuator
- Intuitive navigation menu with three capacitive keys
- LCD display readable in any mounting position (rotatable reading direction)
- Preset parameters – only non-standard values need adjustment
- All parameters saved in non-volatile EEPROM
- Tight-closing function can be activated
- Non-contact position sensing
- Unaffected by environmental effects and steam hammering
Technical Specifications
- Reference variable w: 4 to 20 mA (two-wire, reverse polarity protection)
- Split-range operation: 4 to 11.9 mA and 12.1 to 20 mA
- Minimum current: 3.8 mA
- Static destruction limit: ±33 V
- Supply air: 1.4 to 7 bar (20 to 105 psi)
- Air quality: ISO 8573-1 Class 4 (particles), Class 3 (oil), dew point 10 K below ambient
- Signal pressure: 0 bar up to supply pressure, limitable to approx. 2.3 bar by software
- Hysteresis: ≤0.3 %
- Sensitivity: ≤0.1 %
- Air consumption: ≤100 l n /h (with 6 bar supply and 0.6 bar signal)
- Air output capacity: 8.5 m n ³/h (pressurized, Δp=6 bar); 14.0 m n ³/h (vented, Δp=6 bar)
- Ambient temperature: –25 to +80 °C (limits apply for explosion-protected versions)
- Degree of protection: IP66
- Housing material: Polyphthalamide (PPA)
- Weight: Approx. 1.0 kg
Applications
- Attachment to pneumatic globe valves
- Attachment to rotary actuators
- Direct attachment to Samson Type 3277 actuator
- NAMUR attachment (IEC 60534-6)
- General process control where simple electropneumatic positioning is required
FAQ
Q: Does it auto-calibrate?
A: Yes – variable automatic start-up and self-calibrating.
Q: What attachments are possible?
A: Direct to Samson Type 3277, NAMUR, rotary actuators, and Type 3372.
Related Products
- Samson Type 3730 positioner series
- Type 3277 pneumatic actuator
- Type 3372 actuator for V2001 valves
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