Yokogawa SR-508-00 Safety Relay Module

Description

Yokogawa SR-508-00 Safety Relay Module

Product Dimensions：

The Yokogawa SR-508-00 is a high-reliability Safety Relay Module belonging to the ProSafe-SLS (Safety Lifecycle Solution) family. It is a solid-state, hard-wired module designed for applications requiring the highest safety integrity levels, specifically up to SIL4.

Product Detailed Description

The SR-508-00 is a DIN rail-mountable, single-channel safety relay module. Its primary function is to provide safe galvanic isolation between input control signals and output switching circuits. It is engineered for critical “fail-safe” operations where a failure to shut down could result in catastrophic consequences. Unlike software-based systems, this module uses solid-state logic, eliminating the risks associated with software crashes or operating system errors.

Technical Parameters

Product Advantages

• Ultra-High Safety (SIL4): Designed for the most demanding safety environments (e.g., nuclear or high-pressure petrochemical), meeting requirements for SIL3 and SIL4.
• Safe Isolation: Provides robust 4kV isolation, ensuring that faults on the output side do not migrate back to the sensitive control logic.
• Redundant Status Monitoring: Features a high-visibility Red LED on the top for immediate visual confirmation of the input status.
• Maintenance Friendly: Uses screw terminals for secure connections and is compatible with standard DIN/EN rails, making it easy to integrate into existing control cabinets.
• Gold-Plated Contacts: The contacts are gold-plated over silver alloy, which prevents oxidation and ensures reliable switching even with low-current “dry contact” loads.

Important Considerations & Precautions

• Cyclic Testing: According to Yokogawa’s general specifications, the module should be tested on every system power-on and cyclically every two years to maintain its safety integrity.
• Test Terminals: The module includes test terminals (typically 5 and 8). These are for diagnostic purposes only and must not be used during normal operational mode.
• Environmental Limits: While it operates up to 70°C, ensure there is adequate spacing in the rack to prevent heat buildup, as power dissipation is approximately 1.5 W per module.
• Replacement: Components must only be replaced by the manufacturer or authorized service centers to comply with TÜV safety restrictions.

Product Applications

The SR-508-00 is utilized in “Safety-by-Design” architectures across heavy industries:

• Emergency Shutdown (ESD): Acting as the final switching element to stop motors or pumps in an emergency.
• Burner Management Systems (BMS): Cutting off fuel supply to incinerators or boilers if a flame failure or over-pressure is detected.
• High Integrity Pressure Protection (HIPPS): Used in oil and gas pipelines to isolate high-pressure sources.
• Fire & Gas (F&G) Systems: Activating fire suppression hardware or isolation dampers.

Shipping Port: Xiamen, China

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