The Triconex 3625 is a 32-channel supervised digital output module designed for mission-critical safety instrumented systems (SIS). As part of Triconex’s 3000 series triple modular redundant (TMR) platform, this IEC 61508 SIL3-certified module provides fail-safe control of emergency shutdown valves and fire & gas detection systems in hydrocarbon processing plants. The 3625 module features three independent 24VDC output circuits per channel with built-in diagnostics, achieving <1E-9 probability of failure per hour (PFDavg) in offshore platform applications.
Operating within Tricon V11 architecture, the Triconex 3625 implements 2-out-of-3 voting logic to maintain process continuity during single-fault conditions. Each channel incorporates optical isolation (1500VAC) and load current monitoring (0.5-2A range), enabling real-time detection of field wiring faults in LNG liquefaction trains. The module’s hot-swappable design allows replacement without system shutdown in continuous operations like refinery crude distillation units.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 3625 |
| Manufacturer | TRICONEX |
| Product Type | 32-Channel TMR Digital Output |
| Output Type | 24VDC Sinking (Supervised) |
| Channels per Module | 32 (3 redundant circuits each) |
| Max Load Current | 2A per channel (resistive) |
| Isolation Voltage | 1500VAC channel-to-channel |
| Response Time | <50ms (from input to output) |
| Backplane Current | 800mA @ 5VDC |
| Operating Temp | -40°C to +70°C |
| Housing Material | Anodized aluminum |
| Certifications | IEC 61508 SIL3, ATEX Zone 2 |
Key Features and Advantages:
The Triconex 3625 delivers uncompromising safety with three independent microprocessor-controlled output paths that cross-check each other every 50ms. Its patented “voter” circuitry automatically masks faulty channels while maintaining 2/3 consensus in FCCU (Fluid Catalytic Cracking Unit) emergency venting systems.
Advanced diagnostics monitor output MOSFET health with 10-bit resolution current sensing, detecting open-circuit failures in <100ms for turbine overspeed protection. The module’s conductive cooling design dissipates 25W heat without fans, ensuring reliable operation in Middle Eastern desert environments with 55°C ambient temperatures.
Field-configurable parameters allow setting output states (ON/OFF) during fault conditions via TriStation 1131 software. The front-panel LED matrix provides channel-by-channel status indication for quick troubleshooting in ethylene cracker isolation scenarios.
Application Areas:
The Triconex 3625 is essential in:
- Oil & Gas: Controlling wellhead safety valves during blowout preventer (BOP) activation
- Chemical Plants: Activating emergency deluge systems for reactor overpressure events
- Power Generation: Tripping steam turbine valves upon overspeed detection
- Pharmaceuticals: Managing cleanroom pressure interlocks in API production
In floating production storage vessels (FPSO), this module drives hydraulic shutdown valves with 500ms response time for gas leak containment. Nuclear facilities utilize its TMR architecture to control boron injection pumps with 99.9999% availability. The IP20-rated design withstands vibration levels up to 3g RMS in compressor stations.
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Installation and Maintenance:
Installation preparation: Verify chassis slot compatibility (supports 3000/4000 series backplanes) before inserting 3625 module. Use Belden 8761 shielded twisted pair cables for all field connections in petrochemical plants.
Maintenance recommendations: Perform annual contact resistance tests on output terminals using 4-wire Kelvin method. Replace modules showing >10% current deviation across redundant circuits. Always maintain spare 3625 modules in ESD-protected storage with 40-60% humidity control.
Product Assurance:
HONG KONG SAUL ELECTRICAL LIMITED provides 12-month warranty for all Triconex 3625 modules, including free configuration support for legacy Tricon V9 systems. Each unit undergoes 72-hour burn-in testing with full-load simulation at 70°C. Our global stock guarantees 24/7 emergency delivery to offshore platforms and remote LNG terminals. Complete functional safety documentation (including FMEDA reports) accompanies every shipment.
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