Yokogawa S9129FA Backup Battery Pack
Overview
The Yokogawa S9129FA is a rechargeable nickel-metal hydride (Ni-MH) backup battery pack used in Yokogawa distributed control systems, mainly the CENTUM CS 1000 and CENTUM CS 3000 platforms. When main power is lost, it keeps the module’s configuration memory and real-time clock powered. This preserves configuration data and timekeeping, so the system can resume correctly once power returns without having to be reconfigured.
The S9129FA is a legacy Yokogawa spare part. Distributors publish different nominal voltage and capacity figures for it, and no current first-party Yokogawa datasheet was found to settle them. For that reason, the electrical rating is not stated here and must be confirmed against the installed pack or the module documentation before ordering.
Key Features
- Rechargeable Ni-MH backup battery pack
- Keeps configuration memory and real-time clock powered during power interruptions
- Used in Yokogawa CENTUM CS 1000 and CENTUM CS 3000 DCS hardware
- Replaceable maintenance item for planned preventive replacement
- Identified by Yokogawa part number S9129FA for spare-part ordering
Technical Specifications
| Parameter | Value |
|---|---|
| Part number | S9129FA |
| Manufacturer | Yokogawa Electric Corporation |
| Product type | Backup battery pack |
| Chemistry | Nickel-metal hydride (Ni-MH), rechargeable |
| Used in | Yokogawa CENTUM CS 1000 / CS 3000 DCS |
| Function | Backup for memory and real-time clock |
Applications
- Scheduled replacement of backup batteries in legacy CENTUM CS 1000 and CS 3000 installations
- Critical spares holding for DCS systems in oil and gas, petrochemical and power generation plants
- Replacing a pack after a low-battery alarm, to avoid losing configuration data during a later power outage
Standard practice for critical control systems is to replace backup batteries on a planned maintenance interval rather than waiting for an alarm. A depleted battery combined with an unplanned power interruption can lead to loss of stored configuration.
Yokogawa S9129FA Storage and Handling Notes
The Yokogawa safety data sheet that covers S9129FA groups it with other Yokogawa battery part numbers under nickel metal hydride / nickel cadmium batteries. The pack is built from sealed cylindrical cells in metal cases fitted with a gas release vent, and in normal use there is no leakage or ignition hazard.
For spares handling, the data sheet asks for storage in a cool, dry, ventilated place away from oxidising agents, acids, alkalis and heat sources. The cells are non-flammable but can vent or burst in a fire. For shipment the batteries fall under UN3028 but are exempt from dangerous goods regulations provided they are securely packed and protected against short circuit. Used packs should be recycled where possible or disposed of under local rules.
Why Seven Star LLC
Seven Star LLC supplies Yokogawa DCS spare parts to process plants across Oman and the GCC. Before quoting, we check the part number, the module the pack fits into, and the connector arrangement against your installed hardware, because aftermarket packs can differ in connector orientation and lead length.
Also available: Yokogawa EJX910A Multivariable Transmitter
Request a Quote for Yokogawa S9129FA Backup Battery Pack
Submit a formal inquiry through our RFQ page with the part number S9129FA, the quantity, the CENTUM system and module the pack is installed in, and the voltage and capacity printed on your existing pack label. Our team will confirm the correct battery pack and send a formal quotation.
Related Products
- Document Yokogawa NiMH Battery Packs (S9548FA, S9129FA) Safety Data Sheet Download
Yokogawa is a global Japanese leader in process automation, industrial instrumentation and control systems, with more than a century of engineering expertise. The company designs and manufactures a comprehensive portfolio including distributed control systems (DCS), safety instrumented systems (SIS), field instruments, analyzers, recorders and industrial software platforms used to monitor, control and optimize complex industrial processes.
Yokogawa solutions are widely deployed in oil & gas production and refining, petrochemical plants, power generation facilities, chemical processing, pharmaceuticals, water & wastewater treatment and advanced manufacturing industries. Its instrumentation portfolio covers pressure, flow, level and temperature measurement, alongside advanced process analyzers for gas and liquid analysis.
Known for high reliability, measurement accuracy and long-term stability, Yokogawa systems are engineered for continuous operation in mission-critical environments. With strong capabilities in digitalization, lifecycle management and plant safety, Yokogawa supports operational efficiency, process safety and sustainable industrial performance across global industrial infrastructures.
About Yokogawa: Company and Product Range
Yokogawa Electric Corporation traces its origins to September 1, 1915, when Tamisuke Yokogawa set up an electric meter research institute in Tokyo. The company is headquartered in Tokyo and, with data as of March 31, 2026, reports consolidated net sales of 604.8 billion yen, 18,313 employees worldwide and operations in 63 countries.
The control portfolio is built around CENTUM, released in 1975 and described by the company as the first distributed process control system in the world; the current CENTUM VP is complemented by the ProSafe-RS safety instrumented system and FAST/TOOLS software, marketed under the OpreX brand. In measurement, Yokogawa offers DPharp EJA-E and EJX-A pressure transmitters, ADMAG magnetic flowmeters, ROTAMASS Coriolis flowmeters, digitalYEWFLO vortex flowmeters and GX10, GP10 and GM10 data acquisition products.
Browse Yokogawa products by category: PLC & I/O Cards, Flowmeters, Pressure Instrumentation, Automation Accessories, Temperature Instrumentation.
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