Acoustic Glassbreak Detectors

The acoustic glass-break detectors are designed to detect breaking glass of framed windows in the perimeter of a building. The GS900 series can safely and reliably detect glass breakage on both small and large objects as well as on single or multiple glazed objects. The intelligent audio glass-break detector uses the latest digital signal processing technology.

Signal processing algorithms are based on the analysis of three different parameters [peak amplitude, signal duration and ambient average] in three different frequency ranges [low (infrasound), mid (sound) and high (ultrasonic)] that permit safe and reliable detection of glass breakage. The 3 x 3 signal processing algorithms enable the detector to automatically adjust to different environments.

Passive Glassbreak Detectors

The glass-break detectors are designed to detect the specific ultrasonic frequency range produced by breaking glass.

Knocks and other normal disturbances to a windowpane do not trigger an alarm. Suitable for use on standard window glass or plate glass the detectors provide a two meter radius of protection. The detector may be fitted as close as 2 cm from the window frame and still provide a full two metre radius of coverage on standard glass. They feature a built-in latch LED indicator for easy location of alarmed detectors.

Shock Sensors

Aritech offers a full range of proven shock sensors that provide reliable perimeter protection 24 hours a day.

A break-in is detected as soon as the intruder attempts to force, smash, drill, or even saw the protected window, frame or door, which means the alarm is activated whilst the intruder is still outside. This minimises damage to the building and maximises personal security, since shock sensors can be armed 24 hours a day, allowing unrestricted movement throughout protected premises.

Vibrations caused by traffic, rain or wind will not cause the sensor contact to open because a specially designed damping cylinder inside the sensor head absorbs the energy of minor shocks, therefore preventing false alarms. For example, at a frequency of 4 Hz, which could be that of a passing lorry, an acceleration of 1 G would result in a structural displacement of 10 cm, which equates to earthquake conditions.

The shock sensors can be connected directly to control panels that have zones with incorporated analysing faciliities or can be used in conjuction with dedicated analyser boards. In these cases, the analysing capability has two separate detection criteria: gross attack and pulse count. The gross attack threshold is designed to react to a single blow, while pulse count triggers an alarm when a pre-selected number of smaller shocks, occur within a 30-second timing interval is reached.