The EEx Sounder dEV 21 is a signalling device that generates various signalling tones and signalling tone sequences and emits them at a high sound pressure level. The user may choose between 31 preset signalling tone groups and one programmable one. Every signalling tone group contains 4 different signalling tones. Wire the control inputs with floating contacts or jumpers in order to chose any one of these 4 signalling tones. The sounder has 8 volume levels. All outer fastening parts are made of non-corrosive materials. The stable, all-plastic housing conforms to protection degree IP 66, which means the sounder can be installed both indoors and outdoors. Explosion category II 2 G EEx dem IIC T6 allows the sounder to be operated in hazardous areas of zones 1 and 2.
