Anubis Systems Technologies

 GLASS BREAKAGE DETECTORS (PERIMETER PROTECTION DEVICES)

One of the most innovative devices and probably the best physical intrusion sensor on the market today. This device responds to specific audio frequencies associated with breaking glass. It consists of a sensitive microphone mounted inside a plastic case and quite often is "teamed" with either a seismic or air density sensor. The two technologies working in tandem provide a virtually false alarm free detector. The physical act of dropping a glass on a tile floor directly beneath one of these types of sensors was usually sufficient to trigger a false alarm. The industry has addressed this problem by providing "dual-technology" sensors.

When an exterior window pane is broken the glass itself actually "flexes" or bulges in the few microseconds after an impact and just before it physically breaks or shatters. This action, coupled with the sound made by the breaking glass is how the sensor is able to distinguish between an actual window being broken, and the accidental dropping of a drinking glass. "Flex" is by no means the only other part of the "dual-technology" equation. Other sensors incorporate what resembles a seismic sensor as part of their alarm discrimination circuitry. These types of sensors have to be mounted fairly close to the windows they are protecting, and their installtion requires other "additional" considerations. They have to be attached to a portion of the building structure that is capable of transmitting the "shock" part of the equation. This may not always be possible.

Your alarm consultant will also caution you with respect to curtains, and other window "treatments" that may interfere with the sensor and preclude it from actually detecting an intrusion. It's also very important for the installer to verify the sensor's capacity to detect an alarm condition prior to it's actual physical installation. What this means is that the installer should manually test each detector BEFORE determining the unit's final installation location.

Here are some pictures of different dual technology glass break detectors:

Ademco® 2500 Series

Paradox® GlassTrek

C&K® FG-730

For more information you can email us or telephone (778) 863-7147.