Figure 12. Coarse Alignment Procedure
EYE
REFLECTOR
C0265-00
Figure 13. Housing Screw Locations
SCREW
LOCATIONS
SCREW
LOCATIONS
RESET
SWITCH
C0266-00
Short Circuit Isolation
The detector includes an on-board circuit isolator that
allows for NFPA72 style 7 operation. In cases where style 7
operation is not desired the isolator can be disabled using
the two shunts on the circuit board. See Figure 10 for jump-
er locations. When the jumpers are present the isolator is
disabled. This is the default state.
Sensitivity Selection
The detector has six sensitivity selections. Each of these selec-
tions is only acceptable over a specific distance separation
between the detector and the reflector per ULC and UL268. The
chart below is used to determine which selections are acceptable
for your installed distance. The sensitivity of the detector can
be set only when the housing is removed and the detector is not
in the fine adjustment step of the alignment mode, indicated by
the illumination of the dual digital display. To set the sensitiv-
ity depress the sensitivity button one time. See Figure 10. Once
the switch is pressed the digital display will illuminate and read
the current sensitivity setting in percent obscuration. To change
the sensitivity continue to depress the sensitivity switch until
the desired setting is achieved. The digital display will turn off
automatically if no further switch presses occur.
Sensitivity
Setting
%
Obscuration
Display
Reading
Acceptable
Distance
Between
Detector
and
Reflector
(Feet)
Acceptable
Distance
Between
Detector
and
Reflector
(meters)
Level 1
25
25
16.4 to 120
5.0 to 37.2
Level 2
30
30
25 to 150
7.6 to 46.6
Level 3
40
40
60 to 220
18.3 to 67
Level 4
50
50
80 to 328
24.4 to 100
Acclimate
Level 1
30 to 50
A1
80 to 150
24.4 to 45.7
Acclimate
Level 2
40 to 50
A2
80 to 220
24.4 to 67
In addition to the four standard sensitivity selections the
detector has two Acclimate settings. When either of these
settings is chosen the detector will automatically adjust its
sensitivity using advanced software algorithms to select the
optimum sensitivity for the environment. The sensitivity
will be continuously adjusted within the ranges specified
in the chart above.
Sensitivity
Total obscuration can be converted to percent per foot,
assuming uniform smoke density for the entire length of
the beam. The charts below converts total obscuration to
percent per foot for all acceptable sensitivity settings.
2.0
1.5
1.0
0.5
0.0
0
25% Setting
30% Setting
40% Setting
50% Setting
50
100
150
200
250
300
350
Sensitivity in %/Ft. vs. Distance
(assumes uniform smoke distr ibution)
Distance in Feet
Obscu
ra
tion (%/Ft.)
C0268-00
D400-74-00
10
I56-2542-00R
