The SAMSON TROVIS SAFE 3731-3 is a state-of-the-art, microprocessor-based electropneumatic valve positioner engineered for maximum reliability and safety in demanding and hazardous process environments. It combines a rugged flameproof (Ex d) enclosure with sophisticated digital intelligence, making it an ideal choice for critical control and safety applications, including Safety Instrumented Systems (SIS).
This positioner serves as the precise link between your control system and the pneumatic actuator. It continuously compares the input command signal (4-20 mA) with the actual valve position and instantly adjusts its pneumatic output to correct any deviation, ensuring accurate and responsive valve control.
Its standout feature is the integrated EXPERTplus diagnostic software. This advanced package supports Partial Stroke Testing (PST) for valves in safety-related functions, allowing for regular performance verification without a full process shutdown. With comprehensive self-diagnostics, continuous zero-point monitoring, and configurable alarms, it enables true predictive maintenance and enhanced plant safety.
Designed for universal application, the 3731-3 can be easily mounted on both linear and rotary actuators. It offers direct connection to SAMSON 3277 actuators, mounting per IEC 60534-6-1 (NAMUR) standards for linear valves, and per VDI/VDE 3845 for rotary actuators. Operation is intuitive, featuring a single-knob menu interface and a rotatable LCD display for easy access even in hazardous areas.
Certified for Safety & Hazardous Areas: Flameproof Ex d enclosure and certified according to IEC 61508 for use in Safety Instrumented Systems (SIL), ensuring operation in explosive atmospheres and critical safety loops.
Advanced Valve Diagnostics (EXPERTplus): Enables predictive maintenance through Partial Stroke Testing (PST), detailed performance monitoring, and diagnostics compliant with NAMUR NE 107, helping to prevent unplanned downtime.
Robust and Wear-Free Design: Features a non-contact, calibrated travel sensor with no mechanical gears, guaranteeing long-term accuracy and reliability immune to wear, vibration, or harsh conditions.
Unmatched Flexibility and Easy Setup: Offers four automatic initialization modes, including a unique “Substitution” mode for safe replacement during ongoing plant operation. Pre-set parameters minimize setup time.
Smart Connectivity and Configuration: Supports the HART® communication protocol for remote configuration and integration with asset management systems. Local configuration is done via the SSP interface using the free TROVIS-VIEW PC software.
| Attribute Category | Specification |
|---|---|
| Model / Designation | TROVIS SAFE 3731-3 |
| Manufacturer | SAMSON AG |
| Input Signal | 4 to 20 mA DC, two-wire system |
| Communication Protocol | HART® |
| Travel Range (Linear) | 3.6 to 200 mm |
| Rotation Angle (Rotary) | 24° to 100° |
| Supply Air Pressure | 1.4 to 7.0 bar (20 to 105 psi) |
| Actuator Compatibility | Single-acting & Double-acting (requires Type 3710 Reversing Amplifier for double-acting) |
| Key Features | EXPERTplus diagnostics with PST, Tight-closing function, Automatic startup modes |
| Electrical Connection | 2-wire, Min. load resistance 450 Ω at 20 mA |
| Housing / Protection | Die-cast aluminum, IP66 / NEMA 4X, Flameproof Ex d |
| Ambient Temperature Range | -20 °C to +80 °C (Standard) |
| Certifications | ATEX (Ex d), IEC 61508 / SIL |
| Configuration Software | TROVIS-VIEW (via SSP interface) |
The SAMSON TROVIS SAFE 3731-3 is engineered for critical control applications across a wide range of industries:
Safety Instrumented Systems (SIS) and Emergency Shutdown (ESD) valves.
Process control in Oil & Gas, Petrochemical, and Chemical plants.
Critical loops in Power Generation facilities.
Any application involving on/off service or throttling control in challenging or hazardous environments.
For detailed technical datasheets, configuration support, or to discuss your specific application requirements for the SAMSON TROVIS SAFE 3731-3 valve positioner, please contact our sales team.
If you have any questions about the specifications or the suitability of this positioner for your application, please contact the Kateteco sales team.
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KateTeco (Tianjin) Technology Co., Ltd. serves as an outstanding partner in the field of industrial fluid automation, specializing in the introduction and integration of high-end valves and instruments. We are committed to providing customers with safe, reliable, and intelligent system solutions. By leveraging global leading product resources and supported by systematic professional training and on-site technical assistance from Emerson’s experienced engineers, we ensure that customers can respond promptly and accurately to technical challenges.
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