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490 | Signaling Devices | Signaling Devices
BES External Signaling
Device, Audio/Visual
Features
▶
Activation and control of the sound generator and the
strobe light are monitored
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Tone variants (can be coded via bridges) for:
Hold-up/intrusion alarm
Emergency signal (fire alarm)
▶
Alarm time can be set
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Tamper contact
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Wall mounting
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Mast and corner mounting (optional)
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Tear-off contact (optional)
Bosch external signaling devices are signaling devices with
an integrated sound generator for acoustic alarm and/or a
red strobe light for visual alarm.
Functions
BES external signaling devices are primarily intended for
monitoring the connection to intrusion systems.
Due to the different tone variants of the acoustics, BES can
also be used in fire alarm systems.
The lift-off protection leads to a delay in dismounting and
sets off the acoustic signaling device.
Certifications and Approvals
Region Certification
Europe CE BES
Germany VdS G 197024, C BES A/O
G 197023, C BES A
Installation/Configuration Notes
The danger signal zone is split into warning and emergency
signals.
DIN 33404, Parts 1 and 3 must be observed when planning
for the fire alarm.
The special configuration of the emergency signal allows
the level of audibility to be set at only 10 dB above the
background level. In contrast, the level of warning signals
must be 15 dB higher.
The number of acoustic alarms can be determined from this
requirement.
Planning example:
Sound level -110 dB
Audibility -10 dB
Background level -70 dB
Attenuation = -30 dB
Sound pressure reduction diagram
1 Sound pressure reduction
2 Reduction in sound pressure with reflection dependent upon
room size and echo time
3 Sound pressure reduction without reflection
The diagram (see above) indicates a distance of 32 m for
this attenuation (-30 dB).
It is therefore recommended that an acoustic alarm be
installed approximately every 60 m.
Bosch Security Systems B.V. www.boschsecurity.com
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