Panasonic EBL128 Planning Instructions page 40

Panasonic Eco Solutions Nordic AB
MEW01622 Rev: -
20°C => 3.8 %/m
↓
40°C => 1.8 %/m
b1) OR-functionality: Either the heat detector or the
smoke detector will activate fire alarm. This alternative is
recommended in most cases.
b2) Decision algorithm:
Fire alarm will be activated if:
temperature (°C) + adjusted smoke value
Pre-warning will be activated if:
58 > temperature (°C) + adjusted smoke value
The "Decision algorithm"
reduce so called false alarms (nuisance alarms), because at
a normal room temperature, more smoke is required to
activate fire alarm than when the room temperature is high
↓
(or is rising). By a real fire, the room temperature will rise
rather fast and less and less smoke is required to activate
fire alarm. Very little smoke require a "high" temperature
to activate fire alarm and very much smoke will activate
fire alarm also at a "low" temperature.
70
60
50
40
30
20
10
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
Figure 8. When the calculated value in the decision algorithm
exceeds the lower graph, pre-warning will be activated. When it
exceeds the upper graph, fire alarm will be activated.
Temperature = °C. Smoke value = obscuration (%/m) x 10.
The technical address is set with Address setting tool 3314 /
4414. The detector has an address label on which the
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Adjusted smoke value = obscuration (%/m) x 10. Default heat alarm
levels (50°C / 58°C) and smoke alarm offsets (50 / 58) can be changed via
EBLWin. The temperature can not be lower than 0°C in the algorithm /
graph.
39
The decision algorithm is a violation to the EN54-7 standard.
EBL128 Planning Instructions V2.0.x
39
, see figure can be used to
Smoke value
38
38
> 58.
38
> 50.