Smouldering Smoke Algorithm - Panasonic EBL128 Planning Instructions

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
13.1.7
Next polling the sensor value is approx. "45". 45-15 > 5, i.e. the
decision value "15" is increased by 5 to "20", and so on.
In this example the sensor value starts to decrease before the decision
value reaches the fire alarm level.
decreased to approx. "25" the decision value is set to "30", because
35-25=10 > 5, i.e. the decision value "35" is decreased by 5 to "30",
and so on.
1. The sensor value has reached the pre-warning level but nothing
will happen since the decision value has not yet reached the pre-
warning level.
2. The sensor value has reached the fire alarm level but nothing will
happen since the decision value has not yet reached the fire alarm
level.
3. The decision value has reached / passed the pre-warning level and
pre-warning is activated.
4. The sensor values have started to decrease and the decision value
is now below the pre-warning level and the pre-warning is
automatically reset.
NOTE! In case of a real fire, the sensor values would have stayed at a
"high" value (> 40) for a long time and consequently the decision
value would have increased and reached / passed the fire alarm level
approx. 15 sec. after the sensor value reached the fire alarm level.

Smouldering smoke algorithm

The smoke from a smouldering fire brings the sensor value to rise
very slowly. This might last for hours and sometimes days. To be
able to detect such a smouldering fire at an "early" stage, a
smouldering smoke algorithm is used.
The smouldering smoke algorithm is depending on and is always
working parallel with the selected alarm algorithm, i.e. the
smouldering smoke algorithm will affect the pre-warning and fire
alarm levels, see below.
If the decision value has been over the smouldering level (1) for 7
minutes, the pre-warning and fire alarm levels will be lowered (2):
- The pre-warning level will be lowered to a level right between the
original pre-warning level and the smouldering level.
- The fire alarm level will be lowered to a level right between the
original fire alarm level and the pre-warning level.
If the decision value has reached the pre-warning level (3), but not the
fire alarm level, after additional 90 minutes, the pre-warning and fire
alarm levels will be lowered again (4):
- The pre-warning level will be lowered to the original smouldering
level.
- The fire alarm level will be lowered to the original pre-warning
level.
EBL128 Planning Instructions V1.1.x
When the sensor value has
85