Publicité
Application
The signalling bell dGW21 was
designed to warn, call and signal in
areas with explosive atmospheres
and rough ambient conditions. The
explosion categories Ex d e IIC T6 Gb
and Ex tb IIIC T80°C Db allows the
signalling bell to be used in areas
with explosive atmospheres in zone
1 and 2 and in zone 21 and 22.
The signalling bell produces a
sound volume of approx. 105 dB(A)
at 1 meter distance.
The emphasis of the ring lies at
approx. 1000 Hz, as a result of
which the signal stands out clearly
against lower-frequency ambient
noises. The bell is available for all
usual supply voltages. The version
dRGW 21 comprises a telephone
calling relay and reproduces the
signals in the pulse rate of the
overriding telephone call.
Design
Explosion protection is ensured by
the flameproof enclosure of the
driver system and the terminal box
realised in the explo sion protection
mode
"in creased
safety".
flame proof room contains the elec-
tromagnetic driver system and, for
the design dRGW21 an additional
telephone calling relay. The enclo-
sure is made completely of plastic
thus guaranteeing protection from
corrosion. In addition we realize
insulation class II, so there is no
Technical specification
Enclosure
Colour of enclosure
Insulation class
Protection category
Cable glands
Operating temperature
Storage temperature
Operating mode
Operating utilization position
Operating conditions
Connecting terminals
Sound pressure level
Explosion category
EC-type-examination certificate
Dimensions
Weight
Warning!
t the devices there is hazard of ignition by electrostatic discharges. Charging e.g. by friction or
during cleaning has to be avoided. The assembly has to be carried out in a way that a hazardous electro-static
charging e.g. by pneumatic delivery will be avoided.
equipotential bon ding necessary.
The construction is furthermore
low-weight and very robust. All d.c.
versions are equipped with an
electronic contact breaker which
considerably increases service life
compared with other available
devices.
Recycling
The device can be disposed of
completely as electronic waste.
When the device is disassembled,
plastics, metals and electronics are
to be disposed of separately.
Assembly
The signalling bell is suitable for eit-
her wall or ceiling mounting. Please
refer to page 5 for mounting
dimensions. All fixing elements and
bases must bear the weight of the
device (approx. 3.5 kg). Please
assemble the wall fixtures, which
are part of the scope of delivery,
(including assembly material) and
arrester plate according to Figure 1
on page 5. Make sure the catches
of the safety plate fit in the ope-
nings in the wall bracket.
The
Connecting and adjusting
The device may only be connected
and adjusted by qualified personnel.
The regulations and instructions of
the respective country regarding
connection to the public telephone
network and/or to private branch
exchanges (PBX) have to be con -
Fiberglass reinforced polyester
The locking torque of the upper part screws is: 1.2 ... 1.5 Nm
Black or red
II (no potential bonding necessary).
IP 66 (acc. IEC 529/EN 60529)
1x M20 x 1.5 and vent plugs M20 x 1.5
optionally 2x cable entry M20 x 1.5 for design dRGW21
-20°C bis +40°C
-20°C bis +80°C
Continuous operation as per IEC34; DIN EN 60034-1; VDE 0530 Level S1
Bell dome to the front (tappet downwards)
Inside or outside
1.5 mm
2
stranded wire
2.5 mm
2
solid wire
approx.105 dB(A) at 1 meter distance
Ex d e IIC T6 Gb
Ex tb IIIC T80°C Db (only black housing)
PTB 01 ATEX 1064
Approx. 210 x 190 x 190 mm
Approx. 5.5 kg
sidered. The following regulations
concerning connection and adjust-
ment
are
to
be
Regulations regarding connection
to the mains must also be obser-
ved. Mains connection at terminals
1 and 4. Connection to other
devices at terminals 2 and 3 (see
Fig. 2 on page 5). When using the
telephone calling relay connect
mains to terminals 1 and 2 and the
telephone connection to terminals
3 and 4 (see Fig. 3 on page 5). In
case of factory fitted cable glands
the attached operating instructions
have to be considered.
Remarks
Each signalling bell is adjusted in
the works. Should the sound alter
after a certain number of operating
hours, a qualified person can adjust
the tappet in the device as follows:
• Apply rated voltage
• Push the bell system higher after
unscrewing the system fixing
screws until the sound is optimal
• Replace the system fixing screws
and tighten
These adjustments may be carried
out only outside of the hazardous
area.
Warning:
The device has a very loud sound
volume. To avoid damage to the
hearing, do not come too close to
the sound emitter.
observed.
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