Yokogawa S9548FA DCS Battery Pack

Overview

The Yokogawa S9548FA is a genuine replacement Ni-MH battery pack designed to provide backup power and RAM data retention for Yokogawa distributed control system (DCS) modules, including CS 1000/3000 series controllers and related process automation hardware. Rated at 2.4V with a 1900mAh capacity, the S9548FA maintains critical memory buffering and real-time clock function during main power interruptions, protecting configuration data, historical trend logs, and process variables from loss during unplanned outages or scheduled maintenance windows.

As the official authorized partner and exclusive regional representative for Yokogawa in Oman, 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 genuine Yokogawa battery replacements quickly, avoiding the data-loss risk associated with unauthorized or 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 authorized partner is essential to reliable long-term DCS operation.

Engineering Design of the Yokogawa S9548FA

Physically, the Yokogawa S9548FA is packaged as a compact, pre-wired Ni-MH battery pack with a factory connector that plugs directly into the designated battery slot on the Yokogawa controller card cage or power supply module, requiring no soldering or custom wiring during replacement. The pack is dimensioned to fit the exact mechanical envelope of the original equipment battery holder, ensuring it seats correctly and maintains proper contact pressure for reliable float-charge current delivery.

Rated for over 600 charge-discharge cycles under normal float-service conditions, the S9548FA is manufactured to the same electrical and mechanical specification as the original Yokogawa HHR-21AHF2A1 cell pack, ensuring drop-in compatibility without firmware changes or system reconfiguration. Field technicians can complete a battery swap during a planned maintenance window in a matter of minutes, restoring full backup power protection to the DCS module immediately.

Key Features

The Yokogawa S9548FA replacement battery pack delivers dependable DCS backup power with the following key characteristics:

• Genuine Yokogawa Ni-MH battery pack rated 2.4V, 1900mAh for RAM and real-time clock backup.
• Direct plug-and-play compatibility with Yokogawa DCS controller card cages and power modules.
• Rated for over 600 charge-discharge cycles under continuous float-charge service.
• Factory pre-wired connector eliminates soldering during field replacement.
• Exact mechanical fit to the original equipment battery holder for proper contact pressure.
• Protects configuration data, historical trend logs, and process variables during power interruptions.
• Suitable for scheduled preventive maintenance replacement per Yokogawa service intervals.
• Manufactured to original HHR-21AHF2A1 cell specification for guaranteed compatibility.

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.

As the officially authorized partner for Yokogawa, Seven Star LLC distributes the S9548FA throughout Oman and the GCC, supporting process control rooms and DCS maintenance programs in Sohar, Salalah, and Muscat with genuine battery packs backed by manufacturer warranty. Regional stock availability 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.

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.

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. As the authorized partner for Yokogawa in Oman and the GCC, Seven Star LLC maintains regional warehouse stock for fast dispatch, 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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