Glass Break Sensors


I have several glass windows around my home.  How can I protect the glass?

Glassbreak Sensors detect the intruder before he makes entry.

Although not as common as PIR motion sensors on home security alarm systems, Glass Break Sensors detect breaking glass, and signal through a security alarm control panel to notify Police of potential criminal activity.  Unlike motion sensors, glassbreak sensors detects the activity while the intruder is still outside.  The first types of glassbreak sensors were thin strips of foil tape around the perimeter of a sheet of glass.  When the glass shattered, the foil would rip, causing an alarm.  This technique was labor intensive, unsightly, and prone to damage.

The next type of glass break detection was shock sensors.  One sensor was attached to each glass plate, and when there was a significant “thump” or impact, the sensor transmitted the activity.  These detectors would trip on loud noises or large vibrations (like trucks driving by the house).  They caused a large number of false alarms.

The third leap in technology was an acoustic glassbreak sensor.  It was a device mounted on the wall or ceiling that picked up either loud noises, or strong vibrations.  No longer did we have to put a sensor on each window, but we had the same problem of false alarms due to large vibrations or noises.

As a hybrid solution, they started putting the noise and vibration sensors into one housing, and called it a dual-tech glassbreak sensor.  Not much better.

Now, quality glassbreak sensors are digital detectors.  They are designed to detect the characteristic frequency of breaking glass.  When glass breaks, it starts as a series of micro-fractures within the glass lattice. These micro-fractures have a very specific frequency, and this sound is what the detectors are tuned to sense.  If adjusted properly, they will ignore other loud noises and breakages that are not caused by your window shattering.

Digital glass break sensors only work for sheet glass of a specific thickness.  They will NOT work for louvered windows, plexiglass, laminated glass or wired glass.

If used in the right application and installed properly, digital glassbreak sensors are a valuable tool to help protect your home and family.

Mark Plischke
Aloha Alarm
Honolulu, Oahu, Hawaii

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  6. Sushma Says:

    What type of alarm system is it? Not the sekticr on the window, take a look at the keypad and the main panel circuit board.Once you have done that I can tell you how to change the code. Typically you will need the master code to change it so you may need to contact the realtor. There is a link to a Blogger blog on my website (in the archive) where I can easily answer your question.

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