FURUNO HS-2721 RB-2721 SR 1797 HANDSET UNIT IB 882 TELEPHONE 17:44

The FURUNO HS-2721 (also identified as RB-2721) is a robust, marine-grade telephone handset designed for reliable internal and external communication on board vessels. It is a core component of a ship’s Sound-Powered Telephone and General Alarm system.

The codes you provided give a complete picture:

• HS-2721 / RB-2721: The main model number for the handset unit itself.

• SR 1797: Likely a Furuno internal service reference or a specific kit number.

• IB-882: The Instruction Book (manual) for this unit.

• TELEPHONE: The product category.

• SEO: Likely “Sound-Powered Telephone” or a specific product line code.

Key Features

• Sound-Powered Operation: The primary feature. The microphone generates its own electrical signal using voice power alone, requiring no external power for basic communication. This makes it fail-safe, a critical requirement for emergency communications on ships.

• Dual Functionality:

  1. Intercom Telephone: Used for routine internal communication between key locations on the ship (e.g., bridge, engine room, forecastle, aft steering).

  2. General Alarm Acknowledgment: Integrated into the ship’s general alarm system. When the alarm sounds, crew members can pick up the handset at their station to acknowledge the alarm, confirming their location is manned.

• Rugged Marine Construction: Built to withstand the harsh marine environment, including resistance to moisture, salt spray, vibration, and shock.

• Call Signal Push Button: Features a button to generate a call signal to alert other stations.

• Lanyard and Hanger Hook: Comes with a lanyard and is designed to be stored on a dedicated hanger hook (often part of the station box, not the handset itself) to prevent damage and keep it secure in rough seas.

• Compliance: Designed to meet relevant marine safety standards and regulations (e.g., SOLAS, class society rules).

Technical Specifications (General)

• Type: Sound-Powered Telephone Handset

• Operation: Magneto-type (for ringing) and Sound-Powered (for speech).

• Connections: Typically connects to a central exchange unit or directly to other stations via a multi-wire cable.

• Finish: Durable, corrosion-resistant finish, often a distinctive yellow or grey color common for marine safety equipment.

System Components & Context

The HS-2721 handset is just one part of a larger system:

• Handset Unit (HS-2721): The part the user holds.

• Station Box/Enclosure: A wall-mounted metal box that houses the terminal connections, the call generator (magneto), and the hanger hook. The handset plugs into this box.

• Central Exchange Unit (if applicable): In larger systems, a central panel manages all station connections.

• Cabling: Special marine-grade cabling runs throughout the ship to connect all stations.

Common Applications Onboard

This equipment is installed at vital control points on a vessel, such as:

• Navigation Bridge

• Engine Control Room

• Forecastle (Bow) – for anchor handling and lookout

• Aft Steering Station

• Emergency Generator Room

• Cargo Control Room (on tankers and cargo ships)