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15m (Typical)
110º
30ft/10m
80ft/25m
Mutliple PIR sensors
being used together to
monitor a larger room.
In this example, the
room is approximately
30ft (10m) by 80ft
(25m)
The range and detection
arc of the PIR sensor under
typical conditions.
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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 a cat or similar) can, under some circumstances, trigger
•
the PIR sensors. Therefore, we suggest that the PIR sensors are not suited to
areas where pets are routinely kept.
Placing the PIR Sensors
The PIR sensors have an effective range of between 16ft/5m and 50ft/15m
depending on the specific conditions of the environment. Typically, the sensor will
have a longer range in colder conditions, or in evenly heated environments. The
opposite is also true - environments with uneven temperatures (such as part of the
area in sunlight and other areas in shade) or consistently high temperatures will
lower the effective range of the sensor.
Under typical circumstances, the effective range of the PIR sensor is approximately
50ft/15m. Multiple sensors can be used in conjunction with one another if placed
carefully - see the following diagram.