loud electronic sounder for use in explosion endangered areas of zone 1 and 2 31 different signal tones resp. signal tone groups (4 signal tones per signal tone group)1 programmable signal tone group8 volume settingssynchronisation of tonesmodular system with synthetic housing made of glassfibre reinforced polyester flame-proof chamber "d" - connection chamber in protection class increased safety "e" - encapsulation "m"lower weight - robust and corrosion proof designInsulation class II - no equipotential bonding required
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