Alarm Algorithm / Alternative Alarm Algorithm - Panasonic EBL128 Planning Instructions

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
13.1.5
2. pre-warning will be activated at a lower level (smaller offset)
than for fire alarm, i.e. pre-warning will be activated before fire
alarm will be activated.
3. heavy smoke alarm will be activated at a higher level (bigger
offset) than for fire alarm, i.e. heavy smoke alarm will be
activated after fire alarm has been activated. Heavy smoke alarm
will be saved in the event log.
The pre-warning offset and the heavy smoke alarm level can, for all
detectors, be set in Win128, see chapter "Alarm Algorithms", page
121. See also Win128 help.
The fire alarm offset can, for all detectors, be set in Win128, see
chapter "Alarm Algorithms", page 121. See also Win128 help.
NOTE! Changing these parameters will affect the sensitivity and
detection time and should be done by authorised personnel only!!!!!
In addition, a special password is required to change the fire alarm
parameters.
"Pre-warning", "Fire Alarm" and "Heavy Smoke Alarm" can activate
programmable outputs respectively, see chapter "Control expression",
page 69. See also the EBL128 Operating Instructions.

Alarm algorithm / Alternative alarm algorithm

Alarm algorithm
In order to secure real alarms and reduce nuisance alarms
different alarm algorithms are available. See Figure 17., page 85.
The alarm algorithms are based on:

Normal, high or low sensitivity

Normal (15 sec.) or slow (35 sec.) detection time (alarm delay)
Normal sensitivity. 3.0 % smoke obscuration per meter is required to
activate fire alarm (i.e. fire alarm offset=30). This is default in the
N-15 algorithm and should normally not be changed.
High sensitivity. 2.4 % smoke obscuration per meter is required to
activate fire alarm, i.e. less fire alarm offset than for normal
sensitivity. High sensitivity can be used when an "early" fire alarm is
wanted.
Low sensitivity. 3.6 % smoke obscuration per meter is required to
activate fire alarm, i.e. a higher fire alarm offset than for normal
sensitivity. Low sensitivity can be used to get an extra delay time in
order to reduce nuisance alarms
specifications.
week average sensor value is re-calculated (and adjusted) the fire alarm level
will also be adjusted. The detector sensitivity is accordingly constant.
89
No other heavy smoke alarm information if not an ext. FBP with printer is
available. If so, the heavy smoke alarm information will also be printed out.
90
So called false / unnecessary alarms.
EBL128 Planning Instructions V1.1.x
89
90
but might not fulfil the EN54-7
82
90
, six