Glass Break Sensor Tutorial

By Ari Erenthal, Published Mar 21, 2017, 10:49am EDT (Info+)

Burglars often break glass windows to get into a house. Using glass break detectors in conjunction with alarm contacts is a good way to protect the entire perimeter of a building. In this note, we examine glass break detectors, including

  • Shock vs Acoustic - 4 differences contrasted
  • Sensor ratings - thickness, size, type
  • Types of glass - plate vs tempered vs wired vs laminate
  • Shock sensors explained
  • Video demonstration of shock sensors
  • Acoustic sensors explained
  • 6 factors affecting acoustic glass break detector performance

Shock ** ******** *******

*** *** **** ****** ***** ** glass ***** ******* *** ***** *** acoustic. *** *** *********** ***:

  • ********: ***** ** ******* ** *** glass ******* ******** ** ******* ** a ******* ****** *** *****
  • ***********: ***** ******** *** ******** ******** (i.e., *****) **** ***** ******** ******* the ***** ** *** ***** ********
  • ***** ****: ***** ** **** ********* because ** ******** ******** ** **** pane ******* ******** *** ******* ******** panes
  • ********: ***** ** **** ******** ***** acoustic ***** ****** **** **********, ********** in ***** ************

Sensor ******* - ********* / **** / ****

******* *** ********* ***** ** * combination **:

  • ********* - *** ***** *** ***** is
  • **** - *** ***** (***** / length) *** ***** **
  • **** - **** **** ** ***** is ***** ****

*** ****, *** * **** ****** are:

  • ***** ***** ** *** **** ****** type ** ***** ***** ** *********** and ***** ********** *********. **** ** breaks, ** ******** **** ***** ****** with ****** *****, *********** ** * loud *****. ** ******* ****** ** no ********* **** ** ****** ******* it ** ** **********.
  • ******** *****, **** ***** ** ****** glass, ** ***** ** ***** *****, architectural *******, ********* *****, *** *** other ********* ***** * ****** ***** potentially **** **** *** ******* * large ***** ** *****. ******* ** forming ***** ****** **** *****, ****** edges, ** ******** **** **** ****** that ** **** ****** ** ***** severe ******. ******** ***** ***** * much ******* ***** *** ******** **** less ***** **** ******** **** ***** types ** *****.
  • ***** ***** *** **** ******* ***** in, ** ***** ** ****** ***** and ********* **** ************. ** ** commonly ***** ** **** ***** *** industrial ************. **** ***** ** ******, everything **** *****, ** ****** ***** break.
  • ******** ***** ** *** ****** ** glass **** * ***** ** ******* sandwiched ******. *** ******* ******* **** of *** *****. ** **** *****, t*** ***** ** ******, ********** **** equal, ** ****** ***** *****.

*** *******, ** *** ******* *****, notice *** *** ************ *** ********* performance ***** ** **** ********* *** type:

** ********, ** *** ******* *****, the ************ ********* **** *** ******* size:

*** ************* ***** ****** ** ******* for **** ***** *** **** ** use *** ******** ** ****** ***** planned.

Shock *******

***** *******, ********* ************ ****, *** ******* ******** **** *** glass ****** ***** ****** ***** ****. Inside ** * ********** ** * NC (******** ******) *******. **** *** transducer ********* *****, *** ******* *****, sending ** **** **** ****** ** the *****. *** ****** ***** ******* were ********* *** ***** ******** ******** the ****** ******** *** ** ******* traffic ** *** ****** ********, *** newer, ********** ***** ***** ******* *** able ** *********** *** ********* ******* of * ****** ********** **** ***** types ** *********, *** ******** *** shock **** ** ********** ***** ** open. ***** ******* *** ******** ** protect * ****** **** ** *****. If * ****** ** **** *** multiple ***** ** *****, **** **** will **** *** *** ***** ******.

******* ***** ******* *** ******** ** detect *** ***** **** **** *********** the ********** ** ** ****** **** of *****, ** ****** ****** ****** or****** *****. * ***** ****** **** *** trip ** * ******* **** * circular ****** ** **** * ****, although **** *********** ** ** *********** ********* ****. *******, * ******** designed ***** ****** **** **** ******** contacts, **** ** ***** ***** *********, and ******** *******, **** ** ****** detectors, ** ********** **** *****.

***** ******* ****** ** ******* ** the ****** ** *** ****** **** to **** ********. *** ************ ****** will ******* *** ***** ******** **** the ****** *****, ******* * **** (2.4cm) **** *** *****. *** ************ will **** ******* *** ******* ***** thickness *** ********* **** ******, ******** 1/4" (*.****) ***** **** ** *' (2.4m) ** **' (**) ******.

** **** * ***** ******, ****** the ***** ** *** ******** ****** that *** ****** ** ******* **. Use * ***** ****** ** ******* object ** **** ****, **** ** the **** ** ** ********* ***********. Testing * ***** ****** ******** ******* the ***** **** ***** * *** of *****, *** ***** **** ***** than ** ******** ********* ** * shattering ******.

Video ************* ** ***** *******

** **** ***** *****, ** **** that ***** ******* ****** ***** ****** even **** *** ****** ** ******. Only **** *** ****** ** ****** with ***** **** *** ***** ****** trigger ** *****:

Acoustic *******

** ******** ****** ******** ** * microphone, * **********, *** ** **** microprocessor ********** **** *** ***** ********* of ********* ***** ** ***** ********. When ********** * **** **** * number ** *******, ********** ********* ****** to ***** **** *** ** **** by ******** ** ******** ***** ***** sensor ** *** ****. ** ********* the ************'* ********* ************, ********** *** mount *** ****** ** * **** that ***** ** **** ******* ** possible ****** *** ******'* ********* ****.

** ***** ** **** *** ** acoustic *******, ********** ****** **** ** mind **** ***** ******* ** *****. The ***** ** *** **** *** the ********* **** **** ** **** room ** ***** ** **** ** affect ** *** ***** ***** ******, how **** ** **** ***** ***** travel **** *** ****** ** *** sound ** *** ******** ******, *** how ********** *** ****** *** ********* and ****** ***** *****. *** *******, the ****** **** ********* * ***** differently ** * **** **** **** of **** ******** **** ** * room **** **** ** **** ********, because *** **** ******** **** ******* some ** ***** ***** *** *** soft ******** **** ****** **** ** them.

**** ******* **** ********** *********** ******. To ******** *** ****** ** ***** alarms, *********** ****** ** ****** **** in ***** **** ***** ********** ******** and ****** ** ** ***** **** sound ********* ********. *******, ******, **** hangings, *** *********** ********* *** ****** sound. **** ********, **** ******, *** melamine ******* ********* *** ******* *****. Bookshelves **** ** ******* ***** ***** books ********** **** ** ****** **. Some ************* **** ******** ******* **** adaptive ***************. ** * ***** ***** is ************ ***** ** ***** ******, changing *** ****** ** *** **** adaptive **********, ** * ****** **** another ************ **** ********* ***** ********, may **** ******* ****** ***** ******.

**** ************* **** * ***** ***** simulator, ***** ** * ****** **** plays *** ***** ** ********* ***** of ***** ********. ***** * ***** break *********, ** ********* *** ***** an ******** ***** ***** ******** ******* with * * **** ******* *** temporarily ***** **, ****** ********* ***** in ***** ** ********* *** ******* placement *** *********** ******. ***** ***** noise ******** ****** **** ************ ** manufacturer, ** ** **** ** **** a ****** **** * ********* **** the **** ************.

Hard ******** ******** ***** ******

**** ******** **** ** ******* *****, marble, *** ************* ***** *** ******* normal ***** ** **** * *** that *** ** ************** ** ******** glass ***** *********. **** ********** ****** with **** ********, ***** *** *********** of *** ********.

Dropping ******** ***** ******** ***** ******

**** ***** ********, ** ******* * dull **** ***** *** * **** pitched ***** ** *** **** ****, and ** *** **** ****** ***** signature **** ******** ***** ****** *** listening ***. ***** **** ****** * multilayered ***** **** ******* *** ** misinterpreted ** ***** ***** *********. **** dropped **** * ***** *** ********* for ******* *** ***** ******. *** IPVM **** **** *** *** * glass ***** ******** ********** * *** ** ********, ****** ** *** ******* ** the ********* ****** * ***** **** sound **** *** ******** **********. ***** subscribers ****** ** ***** ***** *** glass *****'* **** ** ********* **, and ** **** ** ***** ********** tossing ****, *********, ***** ********, ** similar ******** ******* ** **** **** while *** ***** ** *****.

Children ******* ********* ***** ******

********** ****** ** ******* **** ********** acoustic ***** ***** ********* ** *********, especially ********** ****. ******** ***** ************* set *** ******** ***** ****** ** rattling *** *****, ******** *****, *** generally ***** ****. ** ********* ***** a ***** ***** ********* *** * battery ******* ***** ***** ********, ** installer *** ******** *** ***** **** to ******* * ******** ** * way **** ******* * *** ********* area **** *** *****. ** ** such **** *** ** *****, ******-******* shock ******* *** *********** *******.

Humidity ****** ******** ******* ** ***********

******* *** ********** ****** ** ******** sensor ******** * ***** *******, ******** sensors ****** *** ** **** ** locations **** ******* **** ********, **** as *********.

Kitchens *** *********** ************ *** ******** *******

******** *** ******* ******* ** **** surfaces **** ** ****, *****, *** metal. ******* ******, ****** ******** **********, and ******* **** ******** *** *** set *** ******** ***** ***** *********. A ***** ***** ********* ****** ** used ** ****** * ********* ******** mounting ****. ******** **** ***** *** dishwashers *** **** ***** ******** ****** malfunctions.

Drapes ***** ***** ***** *********

**** ******** ******* ****** ********* ***** drapes. ** ********, ***** * ***** mount ******** ****** **** ** ******* detection ******** ** *** **** ***** the ****, ****** ********, ******* *** window *** *** *****, *** ** medium ** *** ***********.

Comments (4)

Great article. I'm glad I made the investment in IPVM, it almost ensures I will learn something new every day.

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great article ari!

  very informative !especially for me that i did not know about that high humidity issue with glass break detectors  

 

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Very informative article, thanks Ari

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Thanks for this.  I've been wondering about how GBD's and siren circuits work for years.

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