Detection Area - Swann SW351-CAC Operating Instructions Manual

Detection Area

The PIR sensor has a 360 degree detection field horizontally, and slightly more than
100 degrees vertically. The diagram below shows an average detection pattern
under typical circumstances.
12ft/4m
6ft/2m
Feet / Meters
The effective detection area does depend on the height of the ceiling that the
alarm unit is mounted on. As a general rule, the effective detection radius when
mounted on a ceiling of average height is approximately 9ft/3m.
You can test the functionality of the motion sensor as well as the detection area by
setting up the sensor, setting it to chime mode and then moving about in the area
you want to protect. It will chime each time it detects movement, allowing you to
obtain an accurate impression of it's field of view. Note that the effective detection
range may change in different environmental conditions, particularly during very
hot periods.
Important:
• Any obstructions in the environment will reduce the sensors effectiveness. It
can't see through walls! Even a thin sheet of glass will significantly impair the
range of the sensor, as glass blocks more infrared radiation than visible light.
• Small animals (such as dogs, cats or similar) can trigger the PIR sensors.
Therefore, we suggest that the PIR sensors are not suited to areas where pets
are kept.
• The remote control uses infrared light to communicate with the alarm unit.
For the easiest day-to-day operation of the alarm, mount the alarm unit in a
location which allows the remote control a clear line of sight from the position
you'd like to disarm it from.
4 4 4
Detection Area:
6ft/2m 12ft/4m 18ft/6m 25ft/8m