EEx-Signalling bell

Modular concept with GRP housing for
use in areas with explosive atmospheres
in zone 1 und 2
3 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: IP 66
3 Safety 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 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.
Design
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.
2
Acoustic Signalling
Device in a
chemical plant
The emphasis of the
ringing lies at approx.
1000 Hz, as a result of
which the signal stands
out clearly against lowerfrequency
ambient noises