Yokogawa S9548FA DCS Battery Pack
Overview
The Yokogawa S9548FA is a nickel-metal hydride (Ni-MH) battery pack used for memory backup in Yokogawa control equipment. Yokogawa lists it as the battery pack of the AFV30 field control unit of CENTUM VP (Technical Information TI 33K01B10-50E) and covers it in its safety data sheet for nickel metal hydride/nickel cadmium batteries.
With engineering support in Muscat, Seven Star LLC proudly supplies the S9548FA battery pack to refineries, LNG facilities, and process manufacturing plants across the Sultanate of Oman and the wider GCC. Control system maintenance teams in Muscat, Sohar, and Salalah rely on Seven Star LLC to source Yokogawa battery replacements, avoiding the data-loss risk associated with expired third-party cells during a critical DCS battery swap.
Operating Principle
The Yokogawa S9548FA uses nickel-metal hydride (Ni-MH) cell chemistry, a rechargeable technology chosen for DCS backup applications because it offers stable voltage output, predictable charge-discharge cycling, and a long calendar life when trickle-charged continuously from the host system’s power supply. While the controller is energized from mains or UPS power, the S9548FA is kept in a float-charge state, ready to instantly assume the backup power role the moment an interruption occurs, seamlessly maintaining RAM contents and the real-time clock without any operator intervention.
Because DCS memory buffering batteries operate in continuous float-charge duty for years at a time, cell degradation is gradual and often invisible until a power event exposes the failure, when unsaved configuration and historical data can be permanently lost. This is why Yokogawa specifies scheduled preventive replacement of the S9548FA on a defined maintenance interval rather than run-to-failure, and why sourcing a genuine, correctly dated battery pack from an experienced supply partner is essential to reliable long-term DCS operation.
Engineering Design of the Yokogawa S9548FA
Yokogawa’s safety data sheet lists the S9548FA together with the cell model name HHR-21AHF2A1. Replacement should follow Yokogawa’s maintenance procedure for the host unit, and the replacement cycle depends on the average ambient temperature as shown in the specification table.
Key Features
The Yokogawa S9548FA replacement battery pack delivers dependable DCS backup power with the following key characteristics:
- Genuine Yokogawa Ni-MH battery pack for memory backup of Yokogawa control equipment.
- Backs up controller memory during power interruptions.
- Suitable for scheduled preventive maintenance replacement per Yokogawa service intervals.
- Listed in the Yokogawa safety data sheet together with cell model name HHR-21AHF2A1.
Industrial Applications
The Yokogawa S9548FA battery pack is a critical maintenance spare for refineries, LNG terminals, petrochemical plants, power generation facilities, and desalination plants running Yokogawa distributed control systems, where uninterrupted memory backup is essential to preventing costly process data loss during power interruptions or scheduled controller maintenance. Instrumentation and control engineers rely on genuine replacement battery packs like the S9548FA to keep DCS reliability programs compliant with preventive maintenance schedules.
With manufacturer documentation, Seven Star LLC distributes the S9548FA throughout Oman and the GCC, supporting process control rooms and DCS maintenance programs in Sohar, Salalah, and Muscat. Ordering ahead allows control system teams to replace aging batteries proactively, before an unplanned power event puts historical process data at risk.
Technical Specifications
The table below summarizes the primary technical specifications of the Yokogawa S9548FA replacement battery pack.
| Parameter | Specification |
|---|---|
| Model | Yokogawa S9548FA |
| Cell Chemistry | Nickel-Metal Hydride (Ni-MH) |
| Equivalent Part Number | HHR-21AHF2A1 (cell model name listed with S9548FA in the Yokogawa SDS) |
| Application | Memory backup battery pack of Yokogawa control equipment (battery pack of the AFV30 field control unit per Yokogawa TI 33K01B10-50E) |
| Brand | Yokogawa |
| Recommended Replacement Cycle (Yokogawa) | 3 years at average ambient temperature of 30 °C or lower; 1.5 years at 40 °C or lower; 9 months at 50 °C or lower |
| Listed Application (Yokogawa TI 33K01B10-50E) | Battery pack of the AFV30 field control unit (CENTUM VP); listed as replaceable by the user |
| Transport Classification (Yokogawa SDS) | UN3028; not classified as a dangerous good under ADG, IMDG or IATA (not restricted per Special Provision A123) |
| Storage (Yokogawa SDS) | Cool, dry, well-ventilated area |
Preventive Maintenance and Storage Considerations
Because the Yokogawa S9548FA spends its entire service life on continuous float charge rather than in cyclic duty, its useful life is governed far more by calendar ageing and cabinet temperature than by the number of discharge events it has actually supported. Nickel-metal hydride chemistry degrades progressively faster as ambient temperature rises above normal room conditions, so control cabinets in Omani plant rooms tend to consume battery life more quickly than identical equipment installed in temperate climates. Maintenance planners should therefore treat any published replacement interval as an upper bound and shorten it where measured cabinet temperatures are known to run high.
Established Yokogawa DCS maintenance practice places battery inspection on a routine periodic cycle, with technicians recording the printed expiry date and measuring terminal voltage on the processor modules and node power supply units at each scheduled check. Where a control station uses a redundant processor pair, replacement should be staggered across the two sides rather than performed simultaneously, so that one side always retains valid memory backup while the other is worked on. Spares should be procured with a recent manufacturing date rather than stockpiled, kept in cool dry storage, and routed to a licensed recycler at end of life.
Yokogawa Recommended Replacement Cycle
Safety Data Sheet Information
Request a Quote for Yokogawa S9548FA DCS Battery Pack
Seven Star LLC invites control systems engineers and procurement teams across Oman and the GCC to submit a formal RFQ for the Yokogawa S9548FA replacement battery pack. Working closely with plant engineers in the region, Seven Star LLC supplies on request with lead time confirmed at quotation, provides full technical datasheets on request, and offers direct access to our instrumentation division for DCS maintenance planning support. Contact Seven Star LLC today to secure genuine Yokogawa battery packs with manufacturer-backed quality assurance.
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Yokogawa product families on this page
Pressure is covered by the DPharp transmitters: the EJX110A differential pressure transmitter, the EJX530A and EJA530E in-line gauge pressure transmitters and the EJX910A multivariable transmitter. The ADMAG AXW is the magnetic flowmeter line, and the YTA610 and YTA710 are temperature transmitters. Analyzers include the FLXA402 four-wire and FLXA21 two-wire liquid analyzers, the TDLS8000 tunable diode laser gas analyzer and spare parts for zirconia oxygen analyzers, such as the E7042UD cell assembly kit for the ZR22 detector. Control hardware includes CENTUM VP I/O modules like the ADV161 digital input module and the YS1700 programmable indicating controller.Where Yokogawa instruments are used
EJA and EJX transmitters measure pressure, level and DP flow throughout oil and gas, chemical and power plants. Zirconia oxygen analyzers and the TDLS8000 are used for combustion control on boilers and fired heaters. FLXA analyzers monitor pH, conductivity and dissolved oxygen in water and process streams, and CENTUM modules are bought as replacements for running control systems.Ordering Yokogawa parts: what we need
Send the model and suffix code and the serial number from the nameplate, and for CENTUM modules the style code as well. For transmitters without a code we need span, output protocol, wetted materials, process connection, housing and the approval required. For oxygen analyzer spare parts give the detector and converter models, for example ZR22G and ZR402G, and the part number.Browse Yokogawa products by category: PLC & I/O Cards, Flowmeters, Pressure Instrumentation, Automation Accessories, Temperature Instrumentation.
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