14) Settings
14.1 Tone
Selection
The sounders have 32 different tones that can be selected for
the first stage alarm. The sounders can then be switched to
sound second and third stage alarm tones. The tones are
selected by operation of a DIP switch on the pcb for both DC
and AC units. The tone table on page seven shows the
switch positions for the 32 tones and which tones are
available for the second and third stages. To operate the
sounder on stage one simply connect the supply voltage to
the normal supply terminals (+ve and –ve for DC units, L and
N for AC units).
14.2 Volume
Control
The output level of the BEx sounder can be set by adjusting
the volume control potentiometer (see Fig 9). For maximum
output, set the potentiometer fully clockwise.
BExS110D AC
BExS110D DC
Fig. 9 Location of Volume Control Potentiometer
15) Maintenance, Overhaul & Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19
IEC60079-19
Explosive atmospheres - Equipment repair,
overhaul and reclamation
EN 60079-17
IEC60079-17
Explosive atmospheres - Electrical
installations inspection and maintenance
To avoid a possible ELECTROSTACTIC CHARGE the unit
must only be cleaned with a damp cloth.
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed
prior to opening the unit.
Flameproof threaded joints and cemented joints are not
intended to be repaired.
Warning - High noise levels above 85dB(A)
during operation. High levels of noise may
cause hearing loss, wear suitable ear
protection when equipment is in operation.
Volume Control
Potentiometer
Volume Control
Potentiometer
