Glass Break Sensor Tutorial

By: Ari Erenthal, Published on Mar 21, 2017

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

******** ***** ***** ***** windows ** *** **** a *****. ***** ***** break ********* ** *********** with ***** ******** ** a **** *** ** protect *** ****** ********* of * ********. ** **** note, ** ******* ***** break *********, ********* 

  • ***** ** ******** - 4 *********** ********** 
  • ****** ******* - *********, size, ****
  • ***** ** ***** - plate ** ******** ** wired ** ********
  • ***** ******* *********
  • ***** ************* ** ***** sensors
  • ******** ******* *********
  • * ******* ********* ******** ***** break ******** ***********

[***************]

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

*** *** **** ****** types ** ***** ***** sensors *** ***** *** acoustic. *** *** *********** are:

  • ********: ***** ** ******* to *** ***** ******* acoustic ** ******* ** a ******* ****** *** *****
  • ***********: ***** ******** *** physical ******** (*.*., *****) made ***** ******** ******* the ***** ** *** glass ********
  • ***** ****: ***** ** more ********* ******* ** requires ******** ** **** pane ******* ******** *** monitor ******** *****
  • ********: ***** ** **** accurate ***** ******** ***** alarms **** **********, ********** in ***** ************

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

******* *** ********* ***** by * *********** **:

  • ********* - *** ***** the ***** **
  • **** - *** ***** (width / ******) *** glass **
  • **** - **** **** of ***** ** ***** used

*** ****, *** * most ****** ***:

  • ***** ***** ** *** most ****** **** ** glass ***** ** *********** and ***** ********** *********. When ** ******, ** shatters **** ***** ****** with ****** *****, *********** by * **** *****. It ******* ****** ** no ********* **** ** breaks ******* ** ** so **********. 
  • ******** *****, **** ***** as ****** *****, ** found ** ***** *****, architectural *******, ********* *****, and *** ***** ********* where * ****** ***** potentially **** **** *** shatter * ***** ***** of *****. ******* ** forming ***** ****** **** sharp, ****** *****, ** shatters **** **** ****** that ** **** ****** to ***** ****** ******. Tempered ***** ***** * much ******* ***** *** produces **** **** ***** when ******** **** ***** types ** *****.
  • ***** ***** *** **** threads ***** **, ** order ** ****** ***** and ********* **** ************. It ** ******** ***** in **** ***** *** industrial ************. **** ***** it ******, ********** **** equal, ** ****** ***** break.
  • ******** ***** ** *** layers ** ***** **** * layer ** ******* ********** within. *** ******* ******* most ** *** *****. As **** *****, **** ***** ** ******, everything **** *****, ** detect ***** *****.

*** *******, ** *** example below, ****** *** *** manufacturer *** ********* *********** based ** **** ********* and ****:

** ********, ** *** example *****, *** ************ specifies **** *** ******* size:

*** ************* ***** ****** be ******* *** **** model *** **** ** use *** ******** ** window ***** *******. 

Shock *******

***** *******, ********* ************ ****, *** ******* ******** onto *** ***** ****** using ****** ***** ****. Inside ** * ********** on * ** (******** closed) *******. **** *** ********** registers *****, *** ******* opens, ******* ** **** zone ****** ** *** panel. *** ****** ***** sensors **** ********* *** false ******** ******** *** ****** vibrated *** ** ******* traffic ** *** ****** aircraft, *** *****, ********** based ***** ******* *** **** to *********** *** ********* pattern ** * ****** shattering **** ***** ***** of *********, *** ******** the ***** **** ** shattering ***** ** ****. ***** sensors *** ******** ** protect * ****** **** of *****. ** * window ** **** *** multiple ***** ** *****, each **** **** **** its *** ***** ******.

******* ***** ******* *** designed ** ****** *** shock **** **** *********** the ********** ** ** ****** pane ** *****, ** cannot ****** ****** ** ****** *****. * ***** ****** will *** **** ** a ******* **** * circular ****** ** **** a ****, ******** **** is********* ** ** *********** ********* ****. *******, a ******** ******** ***** system **** **** ******** contacts, **** ** ***** break *********, *** ******** sensors, **** ** ****** detectors, ** ********** **** other. 

***** ******* ****** ** mounted ** *** ****** of *** ****** **** to **** ********. *** installation ****** **** ******* the ***** ******** **** the ****** *****, ******* 1 **** (*.***) **** the *****. *** ************ will **** ******* *** maximum ***** ********* *** detection **** ******, ******** 1/4" (*.****) ***** **** an *' (*.**) ** 10' (**) ******. 

** **** * ***** sensor, ****** *** ***** in *** ******** ****** that *** ****** ** mounted **. *** * blunt rubber ** ******* ****** to **** ****, **** as *** **** ** an ********* ***********. ******* a ***** ****** ******** hitting *** ***** **** quite * *** ** force, *** ***** **** force **** ** ******** generated ** * ********** window. 

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

** **** ***** *****, we **** **** ***** sensors ****** ***** ****** **** when *** ****** ** struck. **** **** *** window ** ****** **** force **** *** ***** sensor ******* ** *****:

Acoustic *******

** ******** ****** ******** of * **********, * transducer, *** ** **** microprocessor ********** **** *** sound ********* ** ********* types ** ***** ********. **** protecting * **** **** a ****** ** *******, installers ********* ****** ** alarm **** *** ** once ** ******** ** acoustic ***** ***** ****** in *** ****. ** following *** ************'* ********* ************, installers *** ***** *** sensor ** * **** that ***** ** **** windows ** ******** ****** the ******'* ********* ****. 

** ***** ** **** use ** ******** *******, installers ****** **** ** mind **** ***** ******* ** waves. *** ***** ** the **** *** *** materials **** **** ** that **** ** ***** to **** ** ****** on *** ***** ***** travel, *** **** ** slow those ***** ****** **** the ****** ** *** sound ** *** ******** sensor, *** *** ********** the ****** *** ********* and ****** ***** *****. For *******, *** ****** will ********* * ***** differently ** * **** with **** ** **** surfaces **** ** * room **** **** ** soft ********, ******* *** hard ******** **** ******* some ** ***** ***** and *** **** ******** will ****** **** ** them. 

**** ******* **** ********** sensitivity ******. ** ******** the ****** ** ***** alarms, *********** ****** ** turned **** ** ***** with sound ********** ******** *** turned ** ** ***** with ***** ********* ********. Carpets, ******, **** ********, and *********** ********* *** absorb *****. **** ********, tile ******, *** ******** covered ********* *** ******* sound. *********** **** ** reflect ***** ***** ***** themselves **** ** ****** it. **** ************* **** acoustic ******* **** ******** microprocessors. ** * ***** break ** ************ ***** to ***** ******, ******** the ****** ** *** with ******** **********, ** a ****** **** ******* manufacturer **** ********* ***** profiles, *** **** ******* future ***** ******. 

**** ************* **** * glass ***** *********, ***** is * ****** **** plays *** ***** ** different ***** ** ***** breaking. ***** * ***** break *********, ** ********* can ***** ** ******** glass ***** ******** ******* with * * **** battery *** *********** ***** it, ****** ********* ***** in ***** ** ********* the ******* ********* *** sensitivity ******. ***** ***** noise ******** ****** **** ************ to ************, ** ** sure ** **** * sensor **** * ********* from *** **** ************.  

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

**** ******** **** ** ceramic *****, ******, *** architectural ***** *** ******* normal ***** ** **** a *** **** *** be ************** ** ******** glass ***** *********. **** protecting ****** **** **** surfaces, ***** *** *********** of *** ********.

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

**** ***** ********, ** creates * **** **** sound *** * **** pitched ***** ** *** same ****, *** ** for **** ****** ***** signature **** ******** ***** breaks *** ********* ***. Items **** ****** * multilayered ***** **** ******* can ** ************** ** glass ***** *********. **** dropped **** * ***** are ********* *** ******* off ***** ******. *** IPVM **** **** *** off * ***** ***** detector ********** * *** ** pretzels, ****** ** *** plastic ** *** ********* making * ***** **** ***** than *** ******** **********. Alarm *********** ****** ** shown ***** *** ***** break's **** ** ********* is, *** ** **** to ***** ********** ******* keys, *********, ***** ********, or ******* ******** ******* ** that **** ***** *** alarm ** *****. 

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

********** ****** ** ******* when ********** ******** ***** break ********* ** *********, especially ********** ****. ******** often ************* *** *** acoustic ***** ****** ** rattling *** *****, ******** balls, *** ********* ***** kids. ** ********* ***** a ***** ***** ********* and * ******* ******* glass ***** ********, ** installer *** ******** *** exact **** ** ******* a ******** ** * way **** ******* * non ********* **** **** the *****. ** ** such **** *** ** found, ******-******* ***** ******* are *********** *******. 

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

******* *** ********** ****** an ******** ****** ******** a ***** *******, ******** sensors ****** *** ** used ** ********* **** ******* high ********, **** ** bathrooms. 

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

******** *** ******* ******* in **** ******** **** as ****, *****, *** metal. ******* ******, ****** ******** vegetables, *** ******* **** utensils *** *** *** off ******** ***** ***** detectors. * ***** ***** simulator ****** ** **** to ****** * ********* detector mounting ****. ******** **** sinks *** *********** *** also ***** ******** ****** malfunctions. 

 

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

**** ******** ******* ****** penetrate ***** ******. ** possible, ***** * ***** ***** acoustic ****** **** ** minimum ********* ******** ** the **** ***** *** arch, ****** ********, ******* the ****** *** *** glass, *** ** ****** or *** ***********.

 

Comments (4)

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

great article ari!

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

 

Very informative article, thanks Ari

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

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