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Samson 3730-3 is an electropneumatic positioner for single-acting pneumatic actuators. It accepts a 4–20 mA input signal and provides accurate valve positioning with HART communication. The unit is known for its simple operation, vibration resistance, and automatic adaptation to different valves and actuators – a common choice in industrial control loops.
Features
Automatic start-up and self-calibration
Rotary pushbutton with clear LCD menu
HART protocol for remote configuration
Tight-closing function option
Non-contact position sensing
Low air consumption in steady state
Robust against environmental effects
Technical Specifications
Input: 4–20 mA DC, two-wire, reverse polarity protected
Min Current: 3.6 mA (display), 3.8 mA (operation)
Supply Air: 1.4–7 bar (20–105 psi)
Air Quality: ISO 8573-1 Class 4 particles, Class 3 oil, dew point 10 K below ambient
Hysteresis: ≤0.3 %
Sensitivity: ≤0.1 %
Ambient Temperature: –20 to +80 °C (standard); –45 to +80 °C with metal gland
Protection: IP66
Housing: Aluminum or stainless steel 1.4581
Applications
Linear pneumatic control valves
Rotary pneumatic actuators
General process control
Plants requiring HART communication
FAQ
Q: Local operation possible? A: Yes – rotary pushbutton and LCD display.