Smouldering Smoke Algorithm - Panasonic EBL128 Planning Instructions

Panasonic Eco Solutions Nordic AB
MEW01622 Rev: -
13.4.3
3. The decision value has here reached the pre-warning level and
pre-warning is activated.
4. The decision value is here below the pre-warning level and the
pre-warning is automatically reset.

Smouldering smoke algorithm

The smoke from a smouldering fire brings the sensor value to rise
very very slowly but not reach the fire alarm level. A smouldering
fire can last for hours and sometimes days. The smouldering smoke
algorithm will detect such a fire at an "early" stage.
The smouldering smoke algorithm is depending on and works in
parallel with the selected alarm algorithm, i.e. the smouldering smoke
algorithm can affect the pre-warning and fire alarm levels, see below.
If the decision value has been over the smouldering level for 7
minutes (1-2 in the figure), the pre-warning and fire alarm levels will
be lowered:
- 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, but not the fire
alarm level, after additional 90 minutes (2-4 in the figure), the pre-
warning and fire alarm levels will be lowered again:
- 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.
If the decision value continue to rise fire alarm will be activated (5 in
the figure).
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, for the whole system, be set in EBLWin,
see chapter "Alarm algorithms", page 144.
EBL128 Planning Instructions V2.0.x
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