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BEKA-BR385 Audible Sounder
Intrinsically safe for use
in all gas hazardous areas.
ATEX, IECEx & FM
certification. 49 first stage,
21 second stage &
9 third stage
alarm sounds. PFEER compliant. Up to 105dB(A)
output. Input overload
protection. Volume control
u IP66 enclosure Can be powered
from BA386
flashing beacon. 3 year guarantee
The BR385 is a third generation
intrinsically safe field mounting
sounder which supersedes the
BA385-IIC and BA385-IIB. The new
sounder, which produces a loud
audible warning signal in a hazardous
area has forty nine different first stage
alarm sounds selectable by internal
switches. Each first stage tone can be
changed to a second or a third stage
alarm sound by an external contact
which may be in the safe or hazardous
area. Selectable outputs include DIN,
NFS, PFEER, Australian and
Singaporean defined warning, alert
and evacuation tones.
Main application of the BR385
sounder is the generation of unique
audible warnings within a hazardous
area. The sounder may be powered
from a wide range of Zener barriers or
galvanic isolators and may be
controlled by any contact or dc supply
in the safe area. The BR385 may
also be switched in the hazardous
area by an intrinsically safe relay, or
any equipment with an intrinsically
safe, simple apparatus switch output,
such as a BEKA Intrinsically safe loop
powered indicator or a serial text
display.
The selected first stage tone can be
changed to a different second or third
stage tone by inter-connecting
sounder terminals using a switch
contact, which may be in the safe or
hazardous area. This enables one
sounder to announce up to three
different conditions, for example,
alarms warning, alarm and automatic
shut-down.
A crystal controlled oscillator
accurately defines the frequency and
repetition rate of each alarm signal.
This ensures that when multiple
BR385 sounders are activated at the
same time the output tones from all
the sounders remain synchronised.
ATEX, IECEx and FM intrinsic
safety certification permits
installation in all gas hazardous zones
and all gas groups. Input safety
parameters allow use with a wide
range of Zener barriers and galvanic
isolators, and zero output parameters
simplify intrinsic safety system design.
A BA386 LED flashing beacon may
be powered from the same Zener
barrier or galvanic isolator as the
sounder. This significantly reduces
installation costs of a combined
sounder and beacon system and
includes an alarm accept function,
while only marginally reducing the
sound output, but may only be used
for ATEX systems. See the BA386
datasheet for full information.
The robust ABS enclosure which is
flame-retardant provides IP66
protection and is suitable for external
mounting. Cable entry is via three
tapped holes which will accept a
20mm glands or conduit fittings. A
20mm knock-out is also provided in
the rear of the enclosure.
The BR385 contains overvoltage
protection to prevent damage during
commissioning and to allow the
sounder to be tested in a safe area
without the need for a Zener barrier or galvanic isolator.
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