SAMSON 3730-3 Electro-Pneumatic Digital Valve Positioner – HART

The SAMSON 3730-3 is a high-precision electro-pneumatic digital valve positioner designed for advanced control of pneumatic actuators in process automation. Featuring HART (Highway Addressable Remote Transducer) communication protocol, this device operates via a 4–20 mA DC analog input signal with superimposed digital HART data, allowing for real-time diagnostics, configuration, and status monitoring.

Loop-powered and engineered for low energy consumption, the 3730-3 derives its operating voltage directly from the control signal, minimizing wiring complexity. Pneumatic modulation is continuous, providing accurate and responsive actuator control. It accepts clean, dry, and oil-free instrument air per ISO 8573-1, with a maximum supply pressure of 7 bar (105 psi).

The unit is protected by a corrosion-resistant, weatherproof enclosure rated IP66 under EN 60529, making it suitable for outdoor and industrial use in harsh environments. Electrical connections are housed internally via a terminal block. The 3730-3 supports NAMUR standard mounting for rotary actuators and direct mounting on linear actuators as per SAMSON guidelines.

With operating temperature ranges from −20°C to +60°C standard (and down to −45°C with extended option), the positioner is versatile across temperature-sensitive applications. It is manufactured in Frankfurt, Germany and available with multiple pneumatic connection configurations (e.g., G 1/4 or NPT 1/4), depending on the order.

Specifications:

– Manufacturer: SAMSON AG
– Model Number: 3730-3100000400000000.01
– Var-ID: 2894657
– Serial Number: 2109627
– Manufactured In: Frankfurt, Germany
– Product Type: Electro-Pneumatic Digital Valve Positioner
– Communication Protocol: HART (superimposed on 4–20 mA signal)
– Input Signal Type: 4–20 mA DC, two-wire, loop-powered
– Operating Voltage: Derived from input current loop
– Power Consumption: Low-power loop-powered design
– Pneumatic Output: Modulating actuator control
– Max. Supply Pressure: 7 bar / 105 psi
– Air Supply Quality: Clean, dry, oil-free (ISO 8573-1)
– Air Connections: G 1/4 or NPT 1/4 (configurable)
– Electrical Connection: Internal terminal block
– Ambient Temperature Range:
 – Standard: −20°C to +60°C
 – Extended Option: −45°C to +60°C
– Storage Temperature: Typically same as operating range
– Protection Class: IP66 (EN 60529)
– Enclosure Type: Weatherproof, industrial-grade
– Material: Corrosion-resistant enclosure
– Weight: 2.5–3.5 kg (based on mounting)
For further specifications or to inquire about this equipment and ReflowX's logistics services, Please contact ReflowX at info@reflowx.com