PIR MOVEMENT ALARM |
The unit consists of a passive infrared detector. The sensor detects
the infrared rays emitted by humans. The sensor o/p is connected to a circuit,
which triggers an alarm when infrarred rays are detected. The unit when
switched on becomes active after 30 seconds. During this time it does not
detect infrared rays. After 30 second if any person enters the room the
infrared rays emitted by the person are detected & alarm operates with in
20 seconds. The alarm operates for 1 minute & stops & the unit is ready
to dectect further interference. If the person does not vacate the room
the alarm continous to operate. The unit is useful for a hall of 25' x 25'
if fixed at one corner.. The unit has a master key to switch on & off.
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