DN-6985 • 04/14/05
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SENSITIVITY SELECTION
The detector has six sensitivity selections. Each of these
selections is only acceptable over a specific distance sepa-
ration between the detector and the reflector per UL 268.
The chart below determines which selections are accept-
able for your installed distance. The sensitivity of the de-
tector can be set only when the housing is removed and
the detector is not in the fine adjustment step of the align-
ment mode, indicated by the illumination of the dual digital
display. To set the sensitivity, depress the sensitivity but-
ton one time. See
Switch Locations diagram. 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 dis-
play will turn off automatically if no further switch presses
occur.
In addition to the four standard sensitivity selections, the
detector has two Acclimate Plus™ settings. When either
Acclimate Plus™ setting is chosen the detector will auto-
matically adjust its sensitivity using advanced software al-
gorithms to select the optimum sensitivity for the environ-
ment. The sensitivity will be continuously adjusted within
the ranges specified in the chart above.
Total obscuration can be converted to percent per foot,
assuming uniform smoke density for the entire length of
the beam. The chart below converts total obscuration per-
cent per foot for all acceptable sensitivity settings.
SWITCH LOCATIONS
WIRING DIAGRAM
WIRING DIAGRAM
(with RTS451/KEY)
Sensitivity
Setting
Percent
Obscuration
Display
Reading
Acceptable
D
ISTANCE
between
detector and
reflector (ft)
Acceptable
D
ISTANCE
between
detector and
reflector (m)
Level 1
25%
25
16.4 to 120
5.0 to 36.6
Level 2
30%
30
25 to 150
7.6 to 45.7
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
6985sens.tbl
6985wir1.wmf
6985swlo.wmf
