Sensitivity Selection - System Sensor BEAM200A Installation And Maintenance Instructions Manual

Figure 12. Coarse Alignment Procedure
Figure 13. Housing Screw Locations
SCREW
LOCATIONS
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
D400-74-00
EYE
REFLECTOR
C0265-00
SCREW
LOCATIONS
RESET
SWITCH
C0266-00
between the detector and the reflector per ULC and UL268. The
chart b elow i s u sed t o d etermine w hich s elections a re a cceptable
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. T o 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
Level 1 25
Level 2 30
Level 3 40
Level 4 50
Acclimate 30 to 50
Level 1
Acclimate 40 to 50
Level 2
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.
Sensitivity in %/Ft. vs. Distance
(assumes uniform smoke distr ibution)
2.0
30% Setting
1.5
40% Setting
1.0
0.5
25% Setting
0.0
0 50 100
10
Display Acceptable
Reading Distance
Between
Detector
and
Reflector
(Feet)
25 16.4 to 120
30 25 to 150
40 60 to 220
50 80 to 328
A1 80 to 150
A2 80 to 220
50% Setting
150 200 250 300
Distance in Feet
Acceptable
Distance
Between
Detector
and
Reflector
(meters)
5.0 to 37.2
7.6 to 46.6
18.3 to 67
24.4 to 100
24.4 to 45.7
24.4 to 67
350
C0268-00
I56-2542-00R