Panasonic EBL128 Planning Instructions page 86

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
H-15
(High
sensitivity,
2.4%)
4301 X=4
4300 X=8
N-15 L-15
(Normal (Low
sensitivity, sensitivity,
3%) 3.6%)
X=5 X=6
X=10 X=12
Figure 17. The six alarm algorithms. Default is alarm algorithm
N-15, i.e. normal detection time (15 sec.) and normal sensitivity
(3%). "X" is the step value. (NOTE! The L-15, H-35, N-35 and
L-35 algorithms might not fulfil the EN54-7 specifications.)
Figure 18. An example showing the alarm algorithm "N-15", i.e.
the step value X = 5. The detector polling time t ≈ 3.4 sec.
Explanations to the figure:
One analog smoke detector 430x using alarm algorithm "N-15", i.e.
normal detection time (15sec.) and normal sensitivity (3.0 %/m). This
gives X = 5. The week average sensor value has in this example been
adjusted (due to contamination) and is now "10"
level is 10+offset 22=32 and the fire alarm level is 10+offset 30=40,
which is the same as 4.0 %/m.
The sensor values and decision values are approx. equal ("10"), until
the polling when the sensor value increases to approx. "27". Since
27-10 > X=5, the decision value is increased by "5" to "15" (10+5).
91
"10" = 1.0 %/m. A new / clean detector has approx. 0.1 %/m, i.e. this
detector is probably mounted in a very "dirty" environment. A detector
mounted in a normal office would after 8-10 years have approx. 0.3 %/m.
EBL128 Planning Instructions V1.1.x
H-35
(High (Normal
sensitivity, sensitivity,
2.4%)
X=2
X=4
91
84
N-35 L-35
(Low
sensitivity,
3%) 3.6%)
X=2 X=2
X=4 X=4
, i.e. the pre-warning