The signalling bell dGW21 was designed to warn, call and signal in areas with explosive atmospheres in group II and rough ambient conditions. The protection type II 2 G EEx de IIC T6 allows the signalling bell to be used without restriction in all ex-areas classified 1 and 2. The signalling bell produces a sound volume of approx. 105dB(A) at 1 meter distance. The emphasis of the ringing lies at approx. 1000 Hz, as a result of which the signal stands out clearly against lowerfrequency ambient noises. The bell is available for all usual supply voltages. The version dRGW 21 emits the signals in time with the connected telephone call. Explosion protection is ensured by the flameproof enclosure of the driver system and the terminal box realised in the explosion protection mode "increased safety". The flameproof room contains the electromagnetic driver system and, for the design dRGW 21 an additional telephone calling relay. The enclosure is made completely of GRP (glass-fibre reinforced polyester) thus guaranteeing protection against corrosion. In addition we realize safety class II, so there is no equipotential bonding necessary. The construction is furthermore lowweight and very robust. All D.C. versions are equipped with an electronic contact breaker which considerably increases service life compared with other available devices.
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