S9548FA Yokogawa CENTUM VP Datasheet & Technical Manual

Yokogawa S9548FA HHR-21AHF2A1 2.4V 1900mAh DCS Battery Unit

Yokogawa S9548FA HHR-21AHF2A1 2.4V 1900mAh DCS Battery Unit

Availability: 20 left in stock

Yokogawa S9548FA Battery Unit The Yokogawa S9548FA, also cataloged as the S9548FA (HHR-21AHF2A1) Battery Unit, operates as a dedicated hardware...

SKU: HHR-21AHF2A1

Manufacturer: Yokogawa
Product No.: HHR-21AHF2A1
Product Type: Power Supplies
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 20g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa S9548FA Battery Unit

The Yokogawa S9548FA, also cataloged as the S9548FA (HHR-21AHF2A1) Battery Unit, operates as a dedicated hardware component for backup power retention and volatile memory preservation within Yokogawa DCS controllers and memory modules. The assembly delivers continuous DC energy to safeguard critical system parameters and system configuration data during main power disruptions.

Hardware Specifications

Parameter	Specification
Model	S9548FA (HHR-21AHF2A1)
Brand	Yokogawa
Origin	Japan
Weight	0.02 kg (20 g)
Dimensions	45 x 20 x 5 mm
Operating Temp	-20 to 55 deg C
Power Consumption	Passive battery backup cell
Chemistry Type	Nickel-Metal Hydride (Ni-MH)
Nominal Voltage	2.4 VDC
Nominal Capacity	1900 mAh
Battery Cell Configuration	2-cell series pack
Form Factor	Internal DCS memory backup pack
Certifications	RoHS, SGS, UN38.3 compliance

4-20 mA HART Loop Protocol & Channel Isolation

The S9548FA backup battery pack provides isolated secondary power directly to memory retention circuits inside DCS processor units, maintaining internal system clock operation and volatile register states independently of the 24 VDC main power bus. By maintaining logic memory integrity during emergency shutdown (ESD) events or total line dropouts, the unit prevents loss of calibration parameters, field device mapping tables, and baseline tuning values associated with connected 4-20 mA HART loop protocol instruments. The physical isolation of the battery pack preserves ground reference integrity across processing nodes and prevents stray supply noise from coupling into high-resolution analog measurement circuits.

Frequently Asked Questions

Q: What is the procedure for replacing the S9548FA battery pack without interrupting active DCS system operations?

A: Technicians can safely hot-swap the S9548FA battery pack while the host controller module remains fully energized by primary 24 VDC system power. When main line power is active, the controller draws operating current from the backplane, permitting technical personnel to disconnect the depleted battery assembly and land the replacement pack without losing SRAM contents or real-time system clock synchronization.

Q: What diagnostic indicators or system alerts signal a depleted S9548FA battery?

A: The host Yokogawa DCS module continuously monitors the cell terminal voltage of the S9548FA. When the voltage drops below the minimum logic backup threshold, the processor triggers a system diagnostic alarm on the operator console and illuminates a dedicated BATTERY LOW LED on the module front panel, indicating that maintenance personnel should replace the pack prior to any scheduled maintenance outage.

Field Installation Guidelines

When installing the S9548FA battery pack into a Yokogawa DCS controller or memory module, first inspect the wiring harness and polarized connector plug for physical damage. Carefully align the keying tabs of the connector with the module mating socket to ensure correct polarity before pressing the connector housing firmly into place. Secure the battery casing into its dedicated retaining clip within the module enclosure to prevent mechanical vibration from dislodging the assembly. Handle the battery pack avoiding short-circuiting the exposed terminal pins, and dispose of depleted Ni-MH cells in full compliance with local environmental regulations.

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