Changing Motion Detector Lenses
Each motion detector is supplied with the Wall-to-Wall lens; three additional
lenses are available for the WLS904 motion detector. The charts on this
page illustrate the range and coverage patterns of each lens.
To change the lens, first open the motion detector by removing the screw in
the bottom of the battery compartment. With the screw removed, pull the
back of the detector away from the front case.
NOTE: The coils and antenna on the motion detector circuit board are very
sensitive components precisely adjusted for maximum performance. Do
not touch the coils or antenna! Even minor distortions can affect the
performance of the motion detector.
Remove the lens holder by pressing down on the top of the holder and pulling
the holder away from the case. When installing the new lens, ensure the
grooved surface faces the interior of the case, and the notches on the lens face
the bottom of the case. Replace the lens holder by snapping it back into place.
Reassemble the motion detector by first engaging the clips on the bottom of
the case. Close the case and then secure the case with the screw in the
bottom of the battery compartment.
Wall-to-Wall Lens
Pet Alley
DSC Model BV-L1
DSC Model BV-L4
Range: 50' L × 60' W (16 m × 18 m)
Range: 50' L × 60' W (16 m × 18 m)
50 ft
15.2 m
0 ft
0 m
15 ft
4.6 m
15 ft
4.6 m
30 ft
9.1 m
30 ft
9.1 m
50 ft
15.2 m
TOP VIEW
SIDE VIEW
50 ft
15.2 m
0 ft
0 m
15 ft
4.6 m
15 ft
4.6 m
30 ft
9.1 m
30 ft
9.1 m
50 ft
15.2 m
TOP VIEW
SIDE VIEW
Corridor Lens
Curtain Lens
DSC Model BV-L2
DSC Model BV-L3
Range: 120' L × 10.5' W (36.5 m × 3 m)
Range: 50' L × 4.4' W (16 m × 1.3 m)
Changing the Motion Detector Sensitivity
The motion detector features Fast and Slow detection
modes, which are set on jumper J1. Jumper J1 is set at the
factory for the Fast detection mode. In a normal operating
environment, this setting provides the best detection.
In certain environments where rapid air movement,
heaters and other variables present problems, use Slow
detection mode to stabilize the detection.
Jumper “J1” is located in the bottom right corner of the
circuit board. To change the setting from Fast to Slow,
move the jumper over one pin, as shown in the diagram.
High Traffic Shutdown Mode
To prolong battery life, the motion detector uses a feature called High Traffic
Shutdown. When motion is detected, the device will transmit to the receiver
and will then shut down for six minutes. If motion is detected again during the
first six minute shutdown time, the unit will reset the shutdown timer to three
minutes. Each time the detector is tripped during the shutdown time, the timer
will be reset to three minutes again. The detector will thus remain in the shut
down mode until it does not detect motion for an entire six minute period.
The High Traffic Shutdown Mode affects testing the motion detector in two ways:
• When performing the
module placement test
, you must tamper the unit.
To do this, remove the detector from the backplate and then replace it.
Once the detector is replaced on the backplate the panel will show and/
or sound the result of the placement test at the keypad.
• When performing a
system test
, the unit must be left idle for six minutes
before testing can be performed. Once six minutes has passed, create
motion in front of the detector to see if the device is both detecting motion
and transmitting to the receiver.
Motion Detector Transmission Delay
A motion detector transmission is always delayed by five seconds. This is
necessary to prevent false alarms caused by a motion sensor transmitting
before a delay zone has a chance to report. This five-second delay cannot
be altered or disabled.
Walk Test Mode
The motion detector has a walk test mode which will activate an LED for
testing purposes. During normal operation, the LED will not turn on.
To put the detector in walk test mode, create a tamper by removing the
detector from its backplate and then replacing it. Each time the detector
senses motion, it will turn on the red LED. Five seconds after motion is
detected, the detector will send a signal to the receiver, and the LED will
flash rapidly 5 times. The detector will be in walk test mode until it has sent
10 transmissions.
NOTE: The Walk Test Mode will override the High Traffic Shutdown Mode.
