The EEx II signalling hooter dGH21was developed for warning, calling and indicating purposes in areas with explosive atmospheres in group II and for rough ambient conditions. Thanks to its compliance with the explosion protection class II 2G EEx de IIC T6, this signalling device can be used without restriction in all areas with explosive atmospheres in zones 1 and 2. The signalling hooter produces a sound volume of approx. 105dB(A) at 1 meter distance. The characteristic hooting sound can be clearly heard above any other higherfrequency sounds in the area. The dRGH21 comprises a telephone calling relay and reproduces the signals in the pulse rate of the overriding telephone call. The explosion protection is given through the flameproof chamber and the chamber “increased safety”. The flameproof chamber contains the electromagnetic drive system and, for the dRGH21, an additional telephone calling relay. The signal membrane is mounted outside of the flameproof room beneath a closing cap with the appropriate sound control. The housing is made of GRP thus guaranteeing protection against corrosion. Furthermore the construction is lowweight and highly robust. All DC versions are equipped with an electronic contact breaker which considerably increases service life compared with other commercially available devices.
Data
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