Activated by the control panel, it gives a loud audio signal to
alert that an intrusion has occurred.
Slide 2
This is an audio detector, normally fixed onto the surface of a
window, which linstens for the specific sound patterns generated by
breaking glass.
Slide 3
These are placed on all entry points, such as doors and
windows. They consist of a magnet on the door/window and a contact
switch on the frame. If the door / wind0w is opened the magnet
moves away from the contact and sets off the alarm.
Slide 4
This is the brain of the system with a microprocessor and a
keypad used to insert the code to activate or deactivate the alarm.
It is linked to each zone of the building and can indicate where an
intrusion has taken place and initiate automatic dialling of
telephone numbers to give an alert.
Slide 5
This may be based on an infrared or photosensitive sensor and
automatically switches on if it detects movement. It is often
enough to deter a potential intruder from making any further
attempt to break in.
Slide 6
This protects against attempts to break through walls, ceilings
or floors. Based on the principle of resonance frequency, it can
sense any abnormal vibration caused by hammering or drilling and
trigger the alarm. It is usually effective up to about 3
metres.
Slide 7
This sense minute changes in infrared (heat) energy, caused by
the movement of an intruder inside a room. If a person enters and
moves within the detecting area, his body radiates more thermal
energy than the surroundigs and activates the alarm.