In addition to the four standard sensitivity selections the detec-
tor 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 sensitiv-
ity 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 chart 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
Sensitivity Testing
NOTE: Before testing, notify the proper authorities that the
smoke detector system is undergoing maintenance,
and therefore the system will be temporarily out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
Detectors must be tested after installation and following
periodic maintenance. The sensitivity of the BEAM1224A/
BEAM1224SA may be tested as follows:
NOTE: Before testing the detector, check for the presence
of the flashing green LED at the receiver, making
sure not to disturb or block the beam. If it does not
flash and the detector is not in trouble or alarm,
power has been lost to the detector (check the wir-
ing).
A. Calibrated Test Filter
The sensitivity of the detector can be tested using an
opaque material to cover the reflector by an amount indi-
cated by the graduated scale on the reflector. (Due to the
high optical efficiency of the reflector the selection of the
opaque material used to block the reflector is not critical.
Acceptable materials include, but aren’t limited to, this
manual or the cardboard packaging inserts.)
Refer to Figure 14 for this procedure.
1. Verify the sensitivity setting of the detector in % obscura-
tion. See the Sensitivity Selection section of this manual
for sensitivity determination if sensitivity is unknown.
2. Place the blocking material over the reflector, lining it
up with the graduated marks that are 10 less than the
detector’s setting in percent obscuration. The detector
should not alarm or fault. Keep the material in place for
a minimum of 1 minute.
3. Place the blocking material over the reflector lining it
up with the graduated marks that are 10 more than the
detectors setting in percent obscuration. The detector
should enter alarm within 1 minute.
Figure 14. Reflector Test Card Procedure
LINE UP EDGE OF
TEST CARD WITH
APPROPRIATE
OBSCURATION LEVEL
MOVE TEST CARD
TO DESIRED AMOUNT
OF OBSCURATION
C0267-00
4. The detector can be reset with the reset switch on the
detector unit, remote reset, or momentarily interrupting
power.
5. Notify the proper authorities that the system is back on
line.
If the detector fails this test several steps should be taken
to determine if the detector is faulty or simply needs to be
re-adjusted before returning the unit. These steps include:
1. Verify all wiring connections and appropriate power is
applied to the detector.
2. Verify that the optical line of sight is free from obstruc-
tions and reflective objects.
D400-73-00
11
I56-2541-00R
