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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.
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...