Motion Sensor  (490-0550)       Overview                Faxback Doc. # 6169

The sensor mounts on the ceiling, a wall or any flat surface.  You connect
wires between the motion sensor's terminal block and terminals in your
alarm system.  This sensor requires 12-volt DC power.  If the terminals
in your alarm system do not provide this power, you must obtain a power
supply.  Your local Radio Shack sells such items.

This sensor detects movement in 12 upper zones and 12 upper zones.  The
sensor's lens responds to heat in the covered area.  When an intruder
enters an area and crosses a zone, the sensor detects the temperature
change and triggers the alarm.

The sensor's sensitivity depends on the mounting location, the sensor's
angle, and the PULSE and GAIN settings.  Pulse count determines how many
zones the intruder must cross and for how long the zones must be violated
before the alarm sounds.  The GAIN control affects how much area the sensor
covers and how sensitive the sensor is to changes in temperature.

*  The sensor reaches its maximum range when mounted on a wall, 7 feet off
   the floor and angled down 4 degrees.  In this position, the sensor's
   zones can cover about 50 feet from the sensor with about 2 feet between
   the zones at 50 feet.  The space between the zones decreases closer to
   the sensor.  Actual coverage depends on the shape of the room and the
   texture of the walls and other surfaces within the room.

Note:  Depending on the mounting height, the area directly under and in
       front of the sensor, from 0 to 15 feet, might not be covered.

*  This sensor is more sensitivity to motions across its zones and less
   sensitive from the zones, so choose a location where an intruder would
   walk across several zones.

Avoiding False Alarms

When you choose the sensor's mounting location, avoid the following
conditions that could cause false alarms:

*  Where sunlight shines directly on the sensor

*  Where heat sources such as space heaters or radiators are

*  Where strong drafts of air hot the sensor, such as from a central
   heating vent or an air conditioner.

*  Where any opening constantly expose the sensor to outside elements

*  Where animals would cross the zones

*  Where it is aimed at heating or air conditioning vents or ducts, an
   exterior metal wall, a refrigerator, exposed light bulbs, fireplaces,
   exterior windows, or anything air might move.

If one zone terminates in one of the areas mentioned, you can mask the zone
mask.  The lens has 18 sections above and below the sensor's center line.
Only the middle 12 upper and lower sections operate.  Cut the mask as
needed and cover the appropriate area of the lens with the mask.
Experiment until you have successfully masked the correct zone(s).

Note:  The sensor's ability to detect temperature changes decreases when
       the reference surface and the intruder's body temperature are almost
       the same.

(RLR-02/25/94)