Yokogawa S9548FA CENTUM VP / ProSafe-RS Replacement Battery Pack

Product Description

The S9548FA is a high-reliability lithium thionyl chloride (Li-SOCl2) battery assembly specifically engineered for Yokogawa control systems. Its primary function is to provide critical volatile memory (VRAM) backup for CPU modules and various communication interface cards during main power interruptions. By maintaining the integrity of system parameters, configuration data, and real-time clock settings, the S9548FA prevents the loss of essential operational logic, ensuring a rapid and safe system recovery after a power cycle.

This industrial-grade power cell is housed in a protective casing with a dedicated lead and connector interface, designed to prevent polarity reversal and ensure a secure fit within high-vibration environments. It is a vital maintenance component for ensuring the long-term uptime of distributed control system (DCS) nodes and safety instrumented system (SIS) racks.

Technical Specifications

• Cell Chemistry: Lithium Thionyl Chloride (Li-SOCl2)

• Nominal Voltage: 3.6 VDC

• Storage Capacity: High-density energy cell optimized for long-term discharge

• Connector Type: Proprietary Yokogawa 2-pin polarized plug

• Operational Lifespan: Typically 3 to 5 years (varies based on ambient temperature and power-off frequency)

• Compatibility: Primarily used in CENTUM VP, CENTUM CS 3000, and ProSafe-RS CPU units

• Self-Discharge Rate: Extremely low (<1% per year at room temperature)

• Storage Temperature: Recommended 0°C to 30°C for maximum shelf life

Maintenance Applications

The S9548FA is deployed across critical control infrastructures to safeguard logic programs in controllers and communication modules. It is an essential spare part for scheduled preventative maintenance cycles in refineries, chemical plants, and power generation facilities where data persistence is mandatory for safety and production continuity.

Frequently Asked Questions

When should the S9548FA battery be replaced?Standard industrial protocol recommends replacement every 3 years. However, if the "BATTERY LOW" diagnostic LED illuminates on the Yokogawa controller, the S9548FA must be swapped immediately while the system is powered up to avoid data loss.

Can I replace the battery while the system is running?Yes, in most Yokogawa CPU architectures, the battery is designed to be replaced under power to ensure the volatile memory remains energized. Please consult the hardware manual for your specific controller model for safety procedures.