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Matsushita Electric Works Fire & Security Technology AB
MEW00442
Rev: -
Exhausts
Exhausts from cars / trucks, lift trucks, lawn mowers, etc. influences
smoke detectors (sensors). If windows and doors are open, exhausts
can "slip in" that way.
Lack of maintenance
Smoke detectors (sensors) are influenced by their environment and
becomes "dirty". In an analogue system (e.g. EBL512) a Service
signal is given when it's time to clean or exchange the smoke detectors
(sensors). The alternative, is to exchange detectors at even intervals,
to be on the safe side.
Change in activities or wrong choice of detector
If the activities in the premises are altered, the detector choice might
also need altering. Due to special environments, see above, an in-
appropriate detector type could have been chosen from the beginning
and thus cause unnecessary alarms.
Miscellaneous
Choosing another type of detector can solve certain problems. Bear
also in mind, that the coverage area can be different for different types
of detectors.
It is however not always the best action to change detector type. Here
is a list of other actions, programmed via Win512, which can be used:
• Alarm delay for smoke detectors / sensors can be used.
• Two-zone or two-unit dependent fire alarm activation can be
used.
• In an installation with addressable detectors / sensors (e.g.
EBL512), the affected detectors can be individually disabled
(or whole zones) when the work is in progress. Bear in mind
that the smoke spreads, and consideration must be taken to
adjacent detectors/zones. Disablements can be done
automatically via a time channel (built-in or external) or via
menu (H2/B1-B3).
• If there is a personnel alarm organisation on site, alert
annunciation can be used.
• Pre-alarm from smoke sensors can be used.
Operating Instructions EBL512, V1.44.x
109
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