Description
Yokogawa SR-508 Safety Relay Module
Product Dimensions：
The Yokogawa SR-508-00 is a high-reliability Safety Relay Module primarily designed for use within the ProSafe-SLS (Safety Lifecycle System) architecture. It provides safe isolation and switching for critical safety-related circuits in industrial environments.
Product Detailed Description
The SR-508-00 is a DIN-rail mountable, single-channel relay module. It serves as a physical interface to ensure reliable shutdown functions, such as cutting off fuel supply or activating emergency stops. A key feature of this module is its safe isolation between the input and output contacts, preventing fault propagation in high-stakes safety systems.
Technical Parameters
| Parameter | Specification |
| Model Number | SR-508-00 (also known by part #510508000) |
| Input Voltage | 24 V DC (-15% / +20%) |
| Input Current | 35 – 40 mA |
| Output Contact | Normally Open (NO), Gold-plated over silver alloy |
| Max Switching Voltage | 250 V AC / 127 V DC |
| Max Switching Current | 2 A (at 30 V DC / 250 V AC) |
| Isolation | 4 kVrms (1 min); 6 kV surge (1.2/50 µs) |
| Safety Integrity Level | Suitable for applications up to SIL 4 |
| Response Time | On delay: 3–10 ms; Off delay: 5–7 ms |
| Protection Rating | IP20 |
| Mounting | DIN rail (35mm) |
Product Advantages
- High Safety Standard: One of the few modules capable of supporting SIL 4 requirements when used within the ProSafe-SLS system, offering the highest level of risk reduction.
- Robust Isolation: Designed with Overvoltage Class III clearance and creepage distances (up to 300V), ensuring safety even during significant electrical transients.
- Fault Prevention: Equipped with diverse internal relays to avoid systematic errors and “stuck-at” fault conditions.
- Durability: Features a high mechanical life of 30 million operations, making it suitable for long-term deployment in harsh industrial settings.
Important Considerations & Precautions
- Testing Frequency: For system-level safety compliance, the module must be tested upon every system power-up and cyclically at least every two years.
- Test Terminals: Terminals 5 and 8 are designated for testing only; they must not be used during normal operational mode.
- Input Polarity: Strictly adhere to the 24 V DC polarity; the red LED indicator should be used to confirm active input status.
- Load Limits: Note that the maximum current decreases significantly as DC voltage increases (e.g., only 0.2 A at 127 V DC). Always verify the load curve before installation.
Product Applications
The SR-508 is widely utilized in “Safety-by-Design” architectures:
- Burner Management Systems (BMS): Specifically used to cut off fuel supply to incinerators or boilers during a trip condition.
- Emergency Shutdown (ESD): Acting as the final switching element to de-energize motors or valves in oil and gas refineries.
- Fire & Gas (F&G) Systems: Triggering suppression systems or sirens when a hazard is detected.
- Nuclear & Petrochemical: Providing the physical “hard-wired” logic interface where software-based safety might be insufficient.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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