Fire Sounder

Miniature Circuit Breaker
Ceiling Mounted Sounder and Flasher
Fire Sounder

Fire Sounder

  • Description
  • Specification

Description

A fire sounder is an essential audible safety device designed to alert building occupants during a fire or emergency. It is typically mounted on walls or ceilings and integrated into a broader fire alarm system controlled by a central panel.

General Description

  • Purpose: To provide a loud, recognizable warning (typically >65 dB) to ensure immediate evacuation.
  • Types:
    • Electronic Sounders: Most common today; utilize electronic circuitry to generate multiple tones and volume levels.
    • Bells & Horns: Traditional devices; bells offer a clear ringing tone, while horns provide a powerful directional blast.
    • Voice Sounders: Use pre-recorded messages to provide specific evacuation instructions.
    • Sounder Bases: Integrated into the mounting base of a detector to save space.
  • Key Features: Many modern units feature selectable tones (often 32–64 options), volume control, and synchronization with other devices to ensure all alarms sound in phase.

Common Technical Specifications

Feature  Standard Range / Specification
Operating Voltage 17V to 30V DC (standard fire applications); some support 9V–60V
Sound Output (SPL) 85 dB to 116 dB(A) at 1 meter
Current Consumption Quiescent: ~500µA; Alarm: 10mA to 55mA (depending on volume/tone)
IP Rating IP21C (Indoor) to IP66 (Outdoor/Weatherproof)
Tone Options 4 to 64 user-selectable tones
Operating Temp -25°C to +70°C for robust units; -10°C to +55°C for standard indoor units
Compliance  EN54-3 (European) or NFPA  72 (US) standards

Installation & Maintenance

  • Mounting: Usually wall or ceiling mounted via a "first-fix" base that allows wiring to be completed before the sounder head is attached.
  • Power: Derived from the alarm loop (loop-powered) or an external 24V DC source.
  • Backup: Must be able to operate for at least 30 minutes on backup power during a failure.

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