Alarm verification concept (AVC)
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Building Technologies
9.6.1 Attendance check
Should an event ('Pre-ALARM', 'ALARM') arise, the operating personnel may
acknowledge presence within the time t1. After acknowledgement, the investigation
time t2 starts. If presence is not acknowledged within the given time t1, ↑ global
alarming is activated.
9.6.2 Investigation time
During the investigation time t2 the operating personnel may examine the indicated
source of alarm and check the cause of the 'ALARM':
● Or is it a real fire (emergency)?
● Is it a smoldering waste-paper basket (minor incident)?
● Has the ↑ site detected a deceptive phenomenon (false alarm)?
In the event of a major incident (emergency), the nearest 'Manual call points' or
<Alarm delay off> must be pressed. ''Immediate global alarming'' is then triggered.
In the case of a ↑ minor incident or ↑ false alarm the operator may reset the
'ALARM' and cancel alarming.
' is not reset within the given time t2, '
Immediate global alarming
activated.
9.6.3 Example of a verification process
Alarm verification proceeds as follows:
● An alarm event activates ↑ local alarming and starts the time t1 for attendance
check.
● Operating personnel acknowledge 'ALARM' on the operating terminal prior to
the expiry of t1. Acknowledging normally silences local alarming (configurable
feature).
If there is no acknowledgment, ↑ global alarming is activated after the expiry of t1.
● After acknowledgement, the investigation time t2 starts. During time t2
operating personnel investigate the fire location.
– In the case of a minor incident the operator resets the 'ALARM' at the
nearest operating terminal. The alarming process stops, and no ↑ global
alarming is activated.
– In the event of a fire, the nearest 'Manual call points' or <Alarm delay off>
must be pressed. 'Immediate global alarming' is triggered.
If there is no reset, 'Immediate global alarming' is also activated after the expiry of
t2.
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