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Phone：+86 15383419322Description
The Woodward 5501-381 is a safety-certified triple-redundant control module engineered for mission-critical applications in extreme environments. As the cornerstone of Woodward’s 5500 Safety Platform, this ruggedized unit delivers SIL 3 (IEC 61508) and ATEX/IECEx Zone 1 certified performance for turbine protection, emergency shutdown systems, and machinery safeguarding. The 5501-381 integrates three parallel 32-bit RISC processors with patented “Diversity Engine” technology, executing dissimilar control algorithms to prevent common-cause failures. Its hermetically sealed titanium enclosure withstands corrosive atmospheres, explosive gases, and sustained vibration (up to 7Grms) in offshore, mining, and arctic operations. With configurable failsafe logic and 5 ms scan times, the Woodward 5501-381 provides deterministic response for high-integrity applications where human safety and asset protection are paramount.
WOODWARD 5501-381
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 5501-381 |
| Manufacturer | Woodward |
| Product Type | SIL 3 Safety Controller |
| Safety Certification | IEC 61508 SIL 3, IEC 62061 Cat. 4, ATEX/IECEx II 2G Ex db IIC T6 Gb |
| Processing Architecture | Triple modular redundant (TMR) with 32-bit RISC cores |
| Scan Time | 5 ms (maximum) |
| I/O Capacity | 64 safety points (configurable DI/DO/AI/AO) |
| Communication Ports | 2 x TSN Ethernet (IEEE 802.1AS), 1 x isolated RS-485 |
| Vibration Resistance | 7 Grms (IEC 60068-2-64) |
| Operating Temperature | -50°C to +85°C (-58°F to +185°F) |
| Ingress Protection | IP68 (submersible to 10m) |
| Hazardous Certification | ATEX/IECEx Zone 1/21, UL HazLoc Class I Div 1 |
| Power Supply | 18-36 VDC (triple-redundant inputs) |
| MTBF | >250,000 hours (IEC 61709) |
| Fault Tolerance | 2oo3 voting, single fault tolerant |
| Watchdog Timers | 3 independent hardware watchdogs |
Main Features and Advantages
Ultra-reliable safety architecture: The 5501-381 implements Woodward’s “Diversity Engine” with three physically separated processing lanes executing dissimilar compiled code. Hardware-based voter units compare outputs every scan cycle, detecting latent errors with diagnostic coverage >99.9%.
Extreme environment resilience: Machined titanium housing with gold-plated connectors resists salt spray, H₂S exposure, and pressure washing. Conformal coated PCBs survive 100% humidity condensation cycles. The -50°C cold-start capability ensures arctic drilling rig protection system availability.
Deterministic TSN integration: Native IEEE 802.1AS support enables microsecond-synchronized communication with Woodward ProSafe™ SIS valves and sensors. Dual-redundant time-sensitive networks maintain <10µs jitter for critical trip signals.
Simplified certification: Pre-certified TÜV SÜD safety templates for 85 common safety functions (ESD, F&G, overspeed) reduce validation time by 70%. Integrated FMEA report generator automates compliance documentation.
Application Field
The Woodward 5501-381 protects high-value assets in lethal environments. Offshore platforms deploy it as the core of emergency shutdown (ESD) systems, monitoring wellhead pressures and gas detection with explosive atmosphere certification. In LNG liquefaction plants, it executes SIL 3 burner management logic for turbine-driven compressors operating at -162°C.
Mining operations rely on the 5501-381 for conveyor fire protection systems, where its IP68 rating withstands hydraulic fluid immersion in tunnel collapses. Arctic pipelines utilize the module’s cold-weather performance for leak detection systems, processing cathodic protection data at -45°C ambient.
Marine applications include dynamic positioning thrusters, where triple redundancy prevents single-point failures during critical maneuvers. For hydrogen production facilities, the ATEX-certified Woodward 5501-381 manages electrolyzer safety interlocks in Zone 1 hazardous areas.
WOODWARD 5501-381
Related Products
Woodward 5501-379: SIL 2 version for less critical applications
Woodward 5502-381: I/O expansion module for additional safety points
Woodward ProSafe™ 5460: SIL 3-certified shutdown valves
Woodward 5471-381: Intrinsically safe power supply
Woodward SCT Safety Configurator: TÜV-certified programming suite
Woodward 5442-381: Ex ia analog input module
Woodward 5466-425: Secure gateway for safety network integration
Woodward 5501-RK: Ruggedized mounting kit for high-vibration zones
Installation and Maintenance
Pre-installation preparation: Verify hazardous area certification matches zone classification. Clean sealing surfaces with isopropyl alcohol before mounting. Use torque-limiting tools (8-10 Nm) for titanium enclosure bolts. Pressurize conduit entries with nitrogen if required by certification.
Maintenance recommendations: Perform voter diagnostics quarterly via SCT Safety Configurator. Replace o-rings every 5 years or after exposure >150°C. Validate hardware diversity annually by injecting artificial faults. Never open enclosure in hazardous areas – return to Woodward SAFE-Service center for recertification. Maintain positive purge pressure if installed in Zone 1.
