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SAMSON Type 3730-3 Electro-pneumatic Valve Positioner
Product Overview
The SAMSON Type 3730-3 is a digital electropneumatic positioner with HART communication for pneumatic linear and rotary actuators. It features self-calibration, an intuitive menu with LCD display, and reliable performance in industrial environments. It is a popular choice for accurate valve positioning in process plants that need HART diagnostics without excessive complexity.
Technical Specifications
Parameter
Specification
Input Signal
4–20 mA DC + HART
Supply Air Pressure
1.4–7 bar (20–105 psig)
Air Consumption
Approx. 0.12 m³/h (4.2 scfh) at 1.4 bar
Stroke
Linear 10–150 mm, rotary 30–100°
Hysteresis
≤ 0.3 % of span
Sensitivity
≤ 0.1 % of span
Linearity
≤ ±1.0 % of span
Ambient Temperature
–20 … +80 °C (–4 … +176 °F)
Enclosure Rating
IP66
Housing Material
Aluminum or stainless steel
Application Industry
Chemical and petrochemical plants
Power generation
Oil & gas processing
Water and wastewater treatment
General industrial automation
Common Problems & Solutions
Problem: Slow calibration → Solution: Automatic start-up and self-calibration
Problem: Output drift → Solution: Simple local adjustment via pushbuttons
Problem: Harsh environment → Solution: IP66 enclosure and wide temperature range