SAMSON 3731-3 Explosion-Proof Electropneumatic Digital Valve Positioner with HART Communication

Product description

The SAMSON 3731-3 Explosion-Proof Digital Valve Positioner is an advanced electropneumatic positioner designed for accurate control of pneumatic control valves in hazardous industrial environments. Featuring Ex d explosion-proof enclosure technology and HART communication, this positioner provides reliable valve positioning, automatic calibration and advanced diagnostic capabilities.

The Type 3731-3 receives a standard 4–20mA control signal from a PLC, DCS or other process control system. It compares the input signal with the actual valve position and adjusts the pneumatic output pressure to achieve the required valve position.

The device supports single-acting and double-acting pneumatic actuators, with mounting options for linear and rotary control valves. Its automatic initialization function simplifies commissioning, while integrated EXPERTplus diagnostics help monitor valve performance and identify operating problems.

The SAMSON 3731-3 is suitable for hazardous-area applications in Bangladesh, including oil and gas facilities, chemical plants, power stations, refineries, pharmaceutical industries and process automation systems.

4. Technical specifications

5. Key features and benefits

• Explosion-proof Ex d design: Designed for installation in appropriately certified hazardous areas.

• HART communication: Supports remote configuration, monitoring and diagnostics.

• Automatic initialization: Automatically adapts to the connected valve and actuator.

• Advanced valve diagnostics: Integrated EXPERTplus diagnostic functions.

• 4–20mA input: Compatible with common PLC and DCS control systems.

• Flexible mounting: Supports linear and rotary pneumatic actuators.

• Local operation: Menu-driven operation with an integrated display.

• Adjustable control characteristics: Supports linear and equal-percentage characteristics.

• Reliable performance: Calibrated travel sensor without wear-prone gears.

6. Industrial applications in Bangladesh

• Oil and gas processing plants

• Chemical and petrochemical industries

• Power generation plants

• Pharmaceutical manufacturing

• Steel and cement industries

• Textile and dyeing industries

• Boiler and steam control systems

• ETP, WTP and STP automation

• Industrial process control systems

• Hazardous-area pneumatic valve automation

7. Compatibility and installation

The SAMSON 3731-3 can be installed on compatible pneumatic linear and rotary actuators.

• SAMSON direct actuator mounting

• NAMUR mounting according to IEC 60534-6-1

• Rotary actuator mounting according to VDI/VDE 3845

• Compatible with suitable PLC and DCS systems using 4–20mA/HART communication

Important: The exact explosion-protection certification, electrical connection, actuator mounting kit and optional features depend on the complete ordering code. Verify the certification against the installation area's hazardous-area classification before purchasing.