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Congratulations on your purchase on this passive infrared motion alarm unit
from
Swann
! This stand-alone alarm unit will help you protect and safeguard
almost any indoor location you want. It’s easy to install and totally wireless.
Passive infrared technology is a popular in the security industry, and can
detect a person in motion at more than a dozen feet away. They’re great for
monitoring small to mid-sized rooms, and don’t suffer from the limitations
that some other sensors do (such as only being able to monitor a single
door or window).
We’d just like to stress that this device is a
deterrent
. Like all physical
systems, it can be circumvented, fooled or disabled (doing so is difficult,
but not impossible). Thus, we recommend that this alarm be used as part
of a larger and more comprehensive security solution, possibly involving
other alarm units, and perhaps a CCTV system.
How it works:
The PIR sensor is a
passive
infrared motion sensor, meaning it detects
infrared radiation rather than projecting it (unlike a security camera with
infrared night vision, which is
active
infrared). All objects emit this “black-
body” radiation (we commonly call it “heat”) and the infrared sensor looks
for any of this radiation which moves.
The passive sensor is not infallible – in particular, it cannot detect objects/
people which are the same temperature as their background. So a human
being moving about on an extremely hot day might go unnoticed. Also,
a security camera with active infrared night vision in the same vicinity as
the infrared sensor may give false alarms (particularly if it is a moving PTZ
system).
Lens for PIR Sensor
Siren
Indicator LED
Keypad
Overview
