Photobeam units create an 'upper' and 'lower' beam between each other. Both photo beams must be broken prior to alarm signal being sent so photo beam sensors eliminate false alarms caused by falling leaves, branches, animals and movement of vegetation due to weather.
These type of sensors are not a new technology by any means! They are currently one of the best established security solutions in the market place. Photo beams provide an invisible 'fence', which when broken by an intruder creates an alarm condition. This makes them particularly suitable for perimeter protection.
Quite simply, photo beam perimeter security have taken active infrared detection to a new level of reliability and protection against false alarms!