Samson 3731-3 Valve Positioner

Feature & Principle

It is an Ex d flameproof electropneumatic smart positioner of Samson TROVIS 3731 series. It receives 4-20mA control signal from DCS, compares the set signal with valve position feedback signal, adjusts pneumatic output pressure to drive the actuator for accurate valve positioning. It supports automatic initialization and self-calibration, integrates EXPERTplus valve health diagnosis, communicates via HART protocol, can be configured locally or by TROVIS-VIEW software.

Specifications

Model: 3731-3 Brand: Samson Input signal: 4~20mA Communication: HART Actuator type: Single / double acting linear and rotary Stroke range: 3.6~300mm, rotary 24~100° Enclosure: Die-cast aluminum flameproof housing Protection class: IP66 Explosion proof: Ex d IIC T6 Operating temperature: -40℃ ~ +80℃ Certification: ATEX, IECEx, SIL2

Components & Diagnostics

Main control circuit board, pneumatic amplifier unit, position feedback sensor, LCD display, flameproof housing, air port assembly, wiring terminal block. Common faults: positioning deviation, air leakage, HART communication failure, diagnostic alarm, display no light.

Product Brief

Samson 3731-3 smart valve positioner, process control spare widely used for petrochemical, refining explosion-proof control valve overhaul and replacement.