Bushnell 11-9320C - Manual (Page 12)

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ABOUT THE PIR SENSOR
The sensor that triggers the trail camera is Passive Infra Red, or PIR. Infrared energy is
essentially heat energy. The PIR detector operates by sensing a change in the infrared level
in its detection zone. This zone is a cone in the center 10 degrees of the camera’s field of
view. The camera establishes an average long-term infrared level. When this level increased
suddenly the PIR detector signals the camera to record a picture and/or an event. Because of
this effect, the PIR detector will be more sensitive at night, when the average temperature is
lower.
You can use the red LED indicator on the front of the camera to confirm the detection zone.
When PIR is sensed, this “PIR detected” indicator will light. The camera’s field of view is a
45 degree cone, centered on the PIR detection zone.
119320C WalMart Trail Sentry man12 12 3/21/07 4:50:30 PM