Samson Control Valve Positioner Type 3731-3 3730-2 3730-3 3730-4 3730-5 Digital Electropneumatic Positioners

The positioner ensures a predetermined assignment of the valve position (controlled variable x) to the input signal (set point w). It compares the input signal received from a control system to the travel or rotational angle of the control valve and issues a corresponding output signal pressure (output variable y).

Special features

• Electropneumatic positioner with HART® communication
• SAM DIGITAL READY
• Die-cast aluminum or stainless steel housing
• Attachment to linear actuators according to IEC 60534-6, VDI/VDE 3847, or SAMSON integral attachment
• Attachment to rotary actuators according to VDI/VDE 3845
• Attachment to double-acting actuators with Type 3710 Reversing Amplifier
• Integrated EXPERTplus diagnostics for control valves
• Any desired mounting position of the positioner (but not suspended)
• Simple one-knob, menu-driven operation
• Easy-to-read display in any mounting position thanks to rotatable reading direction
• Configurable with a computer over the SSP interface using the TROVIS-VIEW software
• Variable automatic start-up thanks to four different initialization modes
• Preset parameters, only values deviating from the standard need to be adjusted
• Calibrated travel sensor without gears susceptible to wear
• Sub (substitution) initialization mode allows the positioner to be started up in case of emergency whilst the plant is running without having to change the valve position.
• All parameters saved in non-volatile EEPROM
• Two-wire system with small electrical load of 410 Ω
• Adjustable output pressure limitation
• Adjustable tight-closing function
• Automatic zero monitoring
• Integrated temperature sensor and operating hours counter
• Two standard programmable position alarms
• Self-diagnostics
• Messages as condensed state conforming to NAMUR Recommendation NE 107, issued over a fault alarm contact or optional analog position transmitter
• DTM file available for integration into FDT frame applications according to specification 1.2

Accessories

• Pressure gauge
• TROVIS-VIEW Software (free of charge)
• Device integration files for engineering tools and systems

Options

• Device compatible with paint
• Additional equipment: inductive limit contact, solenoid valve, analog position transmitter, external position sensor, leakage sensor, binary input​