Panasonic Eco Solutions Nordic AB
MEW01622
Rev: -
EBL128 Planning Instructions V2.0.x
38
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
38
> 58.
Pre-warning will be activated if:
58 > temperature (°C) + adjusted smoke value
38
> 50.
The "Decision algorithm"
39
, see figure can be used to
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.
0
10
20
30
40
50
60
70
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
Smoke value
T
e
m
p
e
r
a
tu
r
e
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
38
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.
20°C => 3.8 %/m
↓ ↓
40°C => 1.8 %/m