Description: Vibration detection sensors mounted on a fence will detect frequency disturbances associated with sawing, cutting, climbing or lifting of the fence.
Classification: Passive - Overt - Terrain Following
Application: Fitted to existing fence structures normally in pairs 30 - 40cm apart with approx 3meters between each pair and which are sited at approx 120 - 170cm above the ground.
Advantages: Inexpensive, easy to install, quickly fitted to existing structures.
Possible Causes of Nuisance Alarms: Poor quality fence, adverse weather conditions, animals, blown debris, vegetation.
Methods of Defeat: Tunnelling or bridging or careful removal of fence fabric.