Panasonic EBL128 Planning Instructions page 88

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
The smouldering smoke algorithm will be aborted and the pre-
warning and fire alarm levels restored to their original values if:
- The decision value becomes lower than the smouldering level.
- The decision value, after the 90 minutes, has not reached the pre-
warning level.
- The decision value, after the 90 minutes and additional 120
minutes, has not reached the fire alarm level.
The smouldering offset can be set in Win128, see chapter "Alarm
Algorithms", page 121.
Figure 19. An example with the smouldering smoke algorithm.
Explanations to the figure:
Analog smoke detector 430x. The week average sensor value has in
this example been adjusted and is now "10"
level is 10+offset 14=24, the pre-warning level is 10+offset 22=32 and
the fire alarm level is 10+offset 30=40.
When a smouldering fire starts, the sensor values and the decision
values will increase very slowly from "10" and upwards.
1. The decision value has reached the smouldering level.
minutes timer is started.
2. After the 7 minutes the decision value is still over the smouldering
level. The pre-warning level and the fire alarm level are therefore
lowered. A 90 minutes timer is started.
3. The decision value has reached the pre-warning level and pre-
warning is activated.
4. After the 90 minutes the decision value is still over the pre-
warning level but has not reached the fire alarm level. The pre-
warning level and the fire alarm level are therefore lowered again.
A 120 minutes timer is started.
5. The decision value has reached the fire alarm level and fire alarm
is activated.
EBL128 Planning Instructions V1.1.x
91
, i.e. the smouldering
86
A 7