EEx-Signalling Hooter dGH 21 / dRGH 21

ATEX II 2 G EEx de IIC T6
3 Housing made of glass-fibre reinforced
polyester (GRP)
3 Volume: approx. 105 dB(A)
3 Protection degree IP 66
3 Protection class II
(no equipotential bonding necessary)
3 Version dRGH 21 with integrated telephone
call relay
3 Integrated terminal box realized in
Ex protection mode increased safety
Application
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.
Design
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.
2
Emergency
Signal in a
chemical plant
The EEx II signalling
hooter dGH21was
developed for warning
in areas with explosive
atmospheres