Types of Warning Signals – Audible

Air horns are non-electrical devices that only operate from a compressed air supply. They offer very high dB output with very low frequency sound making them ideal for very noisy environments. Moflash offers an industrial and marine range. Being non-electrical they can be used in hazardous area Category 1 use.
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Bells are a cost effective traditional signalling device with a wide range of signalling applications. They offer medium dB output with a unique sound. Moflash offers two types: solenoid driven for industrial applications where they are under constant daily use, and a motor driven type more suitable for fire alarm applications.
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Either Electro Mechanical type where the diaphragm is deflected by a moving magnet which is triggered by a make and break contact of the Piezo type where the diaphragm is controlled by an electronic circuit. The Mechanical versions offer medium/high dB output with low frequency sound and are of robust construction.

Piezo versions are relatively low dB and high frequency and are only suitable for local signalling applications.
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The Electronic Sounders are now the most versatile audible warning devices on the market today.

With multiple tone & decibel selections these type of products will satisfy most applications with the added benefit of remote tone selection & voice activation.
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Sirens are powerful motor driven signals driving an internal impeller through a slotted cover creating a unique penetrating sound, traditionally recognisable for creating the ‘air raid’ warning signal.
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Note: This chart displays the theoretical attenuation in perfect conditions in an open area without obstruction. In addition, the sound frequency of the signal used will have a marked effect on the decibel reading at any given point. A much lower sound frequency will achieve a higher dB rating over longer distances (say +3dB against this table) than a much higher sound frequency (say -3dB).