The flameproof BExS110 alarm sounders are suitable for Zone 1 and Zone 2 applications and the BExDS110 sounders also for Zone 21 and 22. Sound level outputs are up to 117dB(A) at 1m 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.