shaped mounting bracket (see figure 1). The angle can then
be adjusted in the direction that the sound is primarily
required to cover. This can be achieved by loosening the two
large bracket screws in the side of the unit, which allow
adjustment in steps of 18
°
. On completion of the installation
the two large bracket adjustment screws on the side of the
unit must be fully tightened to ensure that the unit cannot
move in service.
7)
Safety Warning (Electrostatic Hazard)
The acoustic horn section is made of ABS Plastic, therefore
to avoid a possible ELECTROSTACTIC CHARGE the unit
must only be cleaned with a damp cloth.
8)
Access to the Flameproof Enclosure
In order to connect the electrical supply cables to the sounder
it is necessary to remove the flameproof cover to gain access
to the flameproof chamber. To achieve this remove the four
M6 hexagon socket head screws (see figure 2) and withdraw
the flameproof cover taking extreme care not to damage the
flameproof joints in the process.
Note the four
M6 screws are Class A4-80 stainless steel
and only screws of this category can be used on these
sounders.
It is therefore important that these screws and
their spring washers are kept in a safe place during
installation.
On completion of the cable wiring installation the flameproof
joints should be inspected to ensure that they are clean and
that they have not been damaged during installation. Also
check that the earth bonding wire between the two casting
sections is secure and the ‘O’ ring seal is in place. When
replacing the flameproof cover casting
ensure that it is
square with the flameproof chamber casting before inserting.
Carefully push the cover in place allowing time for the air to
be expelled. Only after the cover is fully in place should the
four M6 Stainless Steel A4-80 cover bolts and their spring
washer be inserted and tightened down. If the cover jams
while it is being inserted, carefully remove it and try again.
Never use the cover bolts to force the cover into position.
9)
Power Supply Selection
It is important that a suitable power supply is used to run the
sounders. The power supply selected must have the
necessary capacity to provide the input current to all of the
sounders connected to the system.
The following table shows the input current taken by the
various sounder units:-
Unit Type
Input
Input
Max.
Voltage
Current
I/P Volts
BExS120D
24V DC
800mA
30V
BExS120D
12V DC
850mA
15V
BExS120D
48V DC
420mA
58V
BExS120D
230V AC
90mA
264V
BExS120D
110V AC
200mA
121V
BExS120D
115V AC
180mA
126V
BExS110D
24V DC
265mA
30V
BExS110D
12V DC
195mA
15V
BExS110D
48V DC
130mA
58V
BExS110D
230V AC
56mA
264V
BExS110D
110V AC
93mA
121V
BExS110D
115V AC
110mA
126V
The input current will vary according to the voltage input level
and the frequency of the tone selected. The current levels
shown above are for the 440Hz Continuous tone @ nominal
input voltage. The 24V and 48V DC units and the 230V AC,
115V AC and 110V AC units have a switching voltage
regulator circuit and therefore the input current level will
decrease slightly as the input voltage in increased and will
increase slightly as the input voltage is reduced. The 12V
units do not have a voltage regulator and therefore their input
current will increase when the input voltage is increased.
The above table also shows the maximum voltages at which
the sounders can be operated.
10)
Cable Selection
When selecting the cable size consideration must be given to
the input current that each unit draws (see table above), the
number of sounders on the line and the length of the cable
runs. The cable size selected must have the necessary
capacity to provide the input current to all of the sounders
connected to the line.
SAFETY WARNING: If the high output BExS120D sounders
are used at high ambient temperatures, i.e. over +40ºC, then
the cable entry temperature may 70ºC and therefore
suitable heat resisting cables must be used, with a rated
service temperature of at least 95ºC.
11)
Earthing
Both AC and DC sounder units must be connected to a good
quality earth. The units are provided with internal and
Figure 1
Plastic Acoustic Horn
Please see Safety Warning
in Section 7 of this manual
Flameproof
Chamber
Flameproof
Cover
S/S Mounting
Bracket
Figure 2
4 off M6 Cover Screws
External Earth
Terminal