Intrusion Sensor Selection guide

By Brian Rhodes, Published Jul 21, 2016, 11:43am EDT (Info+)

When designing intrusion systems, a number of sensor types can be selected, including:

  • Magnetic
  • Acceleromteter
  • Glass Break
  • PE/PIR/Laser Motion
  • Inductive Loop
  • Pressure Pad

While magnetic contacts may be most common, there are most likely multiple devices to choose from and some that may even be better suited for the application.

In this guide, we explain each sensor type, how much they cost, where they are typically used and their comparative strengths and weakness.

********

*** **** ***** *** **** ****** alarm ****** **** * ****** ** keep * ******* ****** **** * door ** ****** ** ****. *** close ********* ** *** ****** ** a ******** **** ******* ***** *********** flowing ******* *** ******. **** *** door ** ****** ** ******, *** magnet ***** **** **** **** ****, causing ** ** ****** **** **** the ********, ******* *** *******.

** ** **** ******** **** ****** the ****** ** **** ** ***** to *** ******. ***** **** ******* are *********, ** **** ******** *** flush ***** *********, *** ***** ********* is *** ****.

  • ****: **** ****** ** *********** *** is ***** ****** ***************** ** *****/******* **** **** *****. If ********** ** * *******, ******** sensors ******** ** ** **** **** frames *** ******, *** ** ******* wires ** * ******* ******** ******* are *********.
  • ****: ***** ** ********* *** **** exploits, *** ***** ******* ******* *** be *********** ****** **** ********* ******* rated ***** *** ****. ****, **** are prone ** ***** ******** **** *****/****** buffet ** *** **** ** *******.
  • ****: ***** *** *********** *****, ********* ranging ******* $* - $** ****.

*** ********* ** *** ******* ********** of ******* ******** ******* *** ************ ********. ******* ** ***** * ****** reed-type ******* **** *** *********** ** defeated ** * ******, ********* ****** held ******** ** *** ******, ************ uses * ******* ******* **** *** cap ****** ** ***** ** **** defeats *** *****.

**** ******** ***** *** ****** ********** comes ** * ****** **** ****, averaging ***** ***** *** ****** ***** of ****** *****.

*************

* ***** *** **** ******** ****** is * ***** ****** *** ****** **** it ********** *****. **** ******, ****** an*************, ******* ** ********** *********, ******* powered, *** * ****** ***** **** (<2"x2"). *** ****** ***** ************ ***** there ** ** ********* **** **** has ** ***** ** ******* *** operation, ***** ** ** ********* **** magnetic ***** ** **** ************. *** units *** ********* ***** ****** ** mount ******** **** ******** ******* (**** as ****** *** ** ****** *****) but *** ** ******* ** ***** and ******* ** ****. **** ********* example [**** ** ****** *********] ** wireless *** *** ** ***** ** even ***** *********** *******:

***** ************** ** ***** *** ******* can ** ********** **** ********* **** magnetic *******, ***** ** *** **** are *** ***** ************ *** *** type, *** ********* **** ********* ******* as ****.

  • ****: ***** *** ********* ****** ** mount ** *****/*******. ****** ***** **** requires ** ***** ********* *** ***.
  • ****: **** **** * *** ****** of ****** ** ****** ****** *** unit ******. ********* ****** ** ******** for **********.
  • *****: ************** ***** **** $** - $75 *** **** ******, *** ********* are ******* ******* ** ***** ******* ~$5 *** ****.

***** ******* (** ****/*** ********/*****)

* ****** ****** *** ********** **** and ********* *****, ******* **** ******* heat ****** (** ****/***-************) *** **** ******* **** *** see **** ******* **** **** * single ****. ********** *** ******* ********** like ***** ***** ** ******* *****, these ******* **** ********* ********* ***** of * ******* **** ** **** and *** ** ***** ** ***** on ****** ******* **** ****.

***** ***** *** ********* ********* ** a **** ***** ** ******* *** either ****** ** ******* ***. *** sensitivity, ******** *****, *** ********** ** false ***** ********** *** ******** ** unit ****** *** *****.

** ***** ** ********* ********, ** (photoelectric *****) *** ***** ********* *** most ***** ** *****, ******** ** PIR (******* *****-*** *******), ******* ** *** *** ******** ********* Guide, **** ***** ***** ***** *** most ****** *** **** ******** *** resistant ** ***** ******.

  • ****: ***** ******** ****, *** ******* performance.
  • ****: ***** *** ** ********* *** if *** ********* ********* ***** ** many ***** ******.
  • *****: ********* ************, *** ****** ***** *** ** $30, ** ** ******** ***** ******* costing $*,*** ** ****.

***** *******

******* *** '***** *********' ******* ***** from **** ****** ** ****** *****. The **** ****** **** ** ***** sensor ** *** '**********' ******** **** ** * ****** tuned ** ***** **** ** *** frequency ************** ** ********** *****. ***** sensors *** **** ***** **** ******* are ******* **** ****** ***** ** lobbies. *** ***** ******** **** *** range ******* ** ******, *** **** are ****** ****-******* ***** **** *** image *****:

******* **********-**** ******* *** **** ** commercial ************, *** ***** ******* ** install *** ********* ***** ******* ****** contact ******* ** ******* ***** ******. In **** *****, *** *********** ******** of *** ********** ** ***** ** not ******* ** ****** **** **** blowing ** ***** ********, *** ** detect ***** ******, *********, ** ***** fences ***** *******:

  • ****: ***** ******* *** ** **** accurate **** ********** ** ******** ***** on ******* ******, *** ********* ******** may *** ****** ******* '******** *****' or ********** *****.
  • ****: ** **** ** ********* ********, audio ******* *** ** * *********** source ** ***** ******. ******** ** 'light *******', **** '***** *******' *** typically ****** ** ***** *** **** square *******.
  • *****: ******* ******* **** ******* $** - $** ****, ******** ******* ***** specialty ********* *** ** $*** ** more ****.

********* ****

********** ********* ******** ** * ******** problem, *** **** ******* ** *** harsh ******** *********** *** **** ******* of *** ***** ********* ***** ********. One ****** ****** ** ***** ** inductive ****** ****, ** * **** embedded **** ***** *** ********* *******. An ********* **** ***** * ***** of ***** ********** ********* **** **** changes **** * ******** **** ****** through ** *** ******* *** ****** induction *****.

*** **** ******, ***** ******* *** indispensable *** ***** **** ********** ************ or **** *********, *** *** **** useful *** ********* ******* ******** ** ******* lots, ******** **********, ** **********.

  • ****: ********* ***** *** ******** **** detecting ********, *** *** ***** ** false ******** ** ********* ** *******. They *** **** ** ******* ** paved *****, *** *** ***** ******** of ****** ****.
  • ****: **** *** **** ****** *** detecting *****. **** **** *** ***** on ***** ******* *** ******* **** drained *** ********* ***** ******** ********.
  • *****: **** ***** **** **** **** $300, *** ****** (****** ****) ** more ********* (******* ******** *******) ***** may **** $**** ** ****.

******** ****

***** ********, ******** ********* **** [**** no ****** *********] *** ** ***** where *********** ******** (** ******** ****) or ******/***** ****** *** ** ****, like ******** ******, *********, ** **** outdoor ********* *****. ******** **** *** typically **** ******* ** *** ********* side ** * **** ** ****** an ******** ******* ** * ****** opening.

* *** ******** ** **** ** they ******* ********** ********** *** **** maintenance **** ***** ****** *****, *** may *** ***** **** ****** ** ignored.

  • ****: ******** **** *** *** ******* and ************* ********, ***** *********** ***** carpet ** ***** ********. *** **** will *** ******* ***** ****** ****** an ****** ** * ******** ****** range ** ********** ******* **** ****.
  • ****: ******* **** ****** '** ******' vs. '**** ******', *** ******* ** heavy **. ***** *****. *** *** itself ********* ******** ************ ** * stable, ********* ******* **** **** ** concrete *** ****** ** **** ** gravel ** ****** *****.
  • *****: *** **** *** **** *** high, ******* ******* **** $*** - $1000 **** *** ******* ******** ************, but *** **** ***** ********* ** outdoor *** ** ***** ******** ***** more **** ~** ** **.

Comparison *****

*** ***** ********* ***** *** ********** in **** *****, ********* ** ***** of **** ** **** ******** ****.

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