BExS120/BExDS120 Alarm Horn Sounders 123dB(A) The flameproof BExS120 alarm sounders are suitable for Zone 1 & Zone 2 applications and the BExDS120 sounders also for Zone 21 & 22. Sound level ouputs are up to 123dB(A) at 1 metre with a choice of 32 alarm tones and 3 remotely selectable stages. The BEx range features enclosures manufactured from corrosion proof, marine grade copper free LM6 aluminium which is phosphated and powder coated. The re-entrant flare horns are high impact, fire retardant ABS. All models have two M20 cable entries, large terminati...