FHF Ex-proof Signalling Hooter dGH 21

Description

The dGH21/dRGH21 Signalling Hooter was designed for warning, calling and indicating purposes in potentially explosive areas of group II and and for rough ambient conditions. The signalling hooter produces a sound level of approx. 105 dB(A) at 1 meter distance. The characteristic hooting sound clearly stands out from any ambient sound of higher frequency. The hooter is available for all common supply voltages. The dRGH21 version comprises a call current relay and issues the signals in the pulse rate of the incoming telephone call. The explosion protection is realized by use of a pressureresistant installation compartment and a terminal compartment of protection type “œincreased safety”. The pressureresistant compartment contains the electromagnetic drive system and, in case of the dRGH21 version also the call current relay. The hooter membrane together with the sound conductor is located outside the pressure resistant compartment under a sealing cover. The housing is made of synthetic material, which ensures a corrosion-free operation and the classification in protection class II. Therefore, no equipotential bonding conductor is needed. The housing design provides a high degree of sturdiness with a light weight. All DC variants are equipped with an electronic disconnector, which ensures a significantly longer life cycle compared to conventional solutions.