Decision Value; Alarm Algorithms For Smoke Detectors / Detection Levels / Offsets - Panasonic EBL512 G3 Planning Instructions
Fire alarm system
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Also See for EBL512 G3:
- Operating instructions manual (134 pages) ,
- User manual (31 pages) ,
- Information (2 pages)
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Panasonic Eco Solutions Nordic AB
MEW01472
Rev: -
Sensor value
Obsc. in % / m
3.1
Fire alarm
offset 3.0 %
1.8
0.1
0
1
2
Smoke puff
or disturbance
16.3
16.4
Planning Instructions Fire alarm system EBL512 G3, United version 2.7.x
i.e. the detector will be more sensitive until it is replaced with a new
one.
Constant
Service signal
sensitivity
given
4
6
Figure 17. The basic working principle for an analog smoke
detector ("sensor"). Sensor value (A), Week average sensor
value (B), Fire alarm offset (3 %/m), Fire alarm level (C) and
Service level (D).
"Sensor Information" is available via menu H4/U4. Via Win512
version 2.7.x and a PC connected to EBL512 G3 United version 2.7.x
you can get "Sensor Information" for all analog detectors on a COM
loop or an individual detector. For an individual detector you can also
get continuous information:
Technical no. | Zone-Address | Min. | Max. | Momentary | Weekly | Performance factor.
Also via the Web-server II 1598 you can get "Sensor Information" for
all analog detectors on a COM loop.
The smoke detector sensor values are presented as obscuration in %
per meter (%/m). (Heat detector values as °C.)
Decision value
In order to secure real fire alarms and reduce the nuisance alarms, a
decision value is calculated. The decision value is used to decide if it
is normal state, pre-warning, fire alarm or heavy smoke alarm and also
in the smouldering smoke algorithm (see page 89). The decision
value is calculated, see chapter "Filtering algorithm, page 87.
Alarm algorithms for smoke detectors /
Detection levels / Offsets
Each alarm algorithm has three detection levels:
1. fire alarm (fire alarm level = the week average sensor value + the
fire alarm offset)
2. pre-warning will be activated (if selected in Win512 version
2.7.x – Control unit Properties) at a lower level (smaller offset)
8
Smoke puff
or disturbance
85
Fire alarm level (C)
Sensor value (A)
Week average
sensor value (B)
Service level (D)
Time
10
12
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