Intrusion Sensor Selection guide

Author: Brian Rhodes, Published on Jul 21, 2016

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.

**** ********* ********* *******, a ****** ** ****** types *** ** ********, including:

  • ********
  • **************
  • ***** *****
  • **/***/***** ******
  • ********* ****
  • ******** ***

***** ******** ******** *** be **** ******, ***** are **** ****** ******** devices ** ****** **** and **** **** *** even ** ****** ****** for *** ***********.

** **** *****, ** explain **** ****** ****, how **** **** ****, where **** *** ********* used *** ***** *********** strengths *** ********.

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*** **** ***** *** most ****** ***** ****** uses * ****** ** keep * ******* ****** when * **** ** window ** ****. *** close ********* ** *** magnet ** * ******** reed ******* ***** *********** flowing ******* *** ******. When *** **** ** window ** ******, *** magnet ***** **** **** this ****, ******* ** to ****** **** **** the ********, ******* *** circuit.

** ** **** ******** that ****** *** ****** to **** ** ***** to *** ******. ***** many ******* *** *********, in **** ******** *** flush ***** *********, *** basic ********* ** *** same.

  • ****: **** ****** ** inexpensive *** ** ***** enough ***************** ** *****/******* **** hand *****. ** ********** is * *******, ******** sensors ******** ** ** sunk **** ****** *** common, *** ** ******* wires ** * ******* wireless ******* *** *********.
  • ****: ***** ** ********* and **** ********, *** using ******* ******* *** be *********** ****** **** expensive ******* ***** ***** are ****. ****, **** are ***** ** ***** alarming **** *****/****** ****** in *** **** ** vibrate.
  • ****: ***** *** *********** units, ********* ******* ******* $3 - $** ****.

*** ********* ** *** general ********** ** ******* magnetic ******* *************** ********. ******* ** ***** a ****** ****-**** ******* that *** *********** ** defeated ** * ******, unpowered ****** **** ******** to *** ******, ************ uses * ******* ******* ball *** *** ****** to ***** ** **** defeats *** *****.

**** ******** ***** *** tamper ********** ***** ** a ****** **** ****, averaging ***** ***** *** street ***** ** ****** units.

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

* ***** *** **** flexible ****** ** * small ****** *** ****** when ** ********** *****. This ******, ****** ***************, ******* ** ********** networked, ******* *******, *** a ****** ***** **** (<2"x2"). *** ****** ***** construction ***** ***** ** no ********* **** **** has ** ***** ** exactly *** *********, ***** is ** ********* **** magnetic ***** ** **** applications. *** ***** *** typically ***** ****** ** mount ******** **** ******** objects (**** ** ****** art ** ****** *****) but *** ** ******* on ***** *** ******* as ****. ************* ********* ******** *** *** be ***** ** **** basic *********** *******:

***** ************** ** ***** and ******* *** ** moderately **** ********* **** magnetic *******, ***** ** why **** *** *** total ************ *** *** type, *** ********* **** generally ******* ** ****.

  • ****: ***** *** ********* enough ** ***** ** doors/windows. ****** ***** **** requires ** ***** ********* for ***.
  • ****: **** **** * few ****** ** ****** is ****** ****** *** unit ******. ********* ****** be ******** *** **********.
  • *****: ************** ***** **** $20 - $** *** each ******, *** ********* are ******* ******* ** cells ******* ~$* *** year.

***** ******* (** ****/*** Detector/Laser)

* ****** ****** *** monitoring **** *** ********* areas, ******* **** ******* heat ****** (** ****/***-************) *** **** ******* they *** *** **** farther **** **** * single ****. ********** *** outdoor ********** **** ***** lines ** ******* *****, these ******* **** ********* detection ***** ** * hundred **** ** **** and *** ** ***** to ***** ** ****** smaller **** ****.

***** ***** *** ********* available ** * **** range ** ******* *** either ****** ** ******* use. *** ***********, ******** range, *** ********** ** false ***** ********** *** elements ** **** ****** and *****.

** ***** ** ********* accuracy, ** (************* *****) are ***** ********* *** most ***** ** *****, followed ** *** (******* infra-red *******),******* ** *** *** Detector ********* *****, **** ***** ***** being *** **** ****** yet **** ******** *** resistant ** ***** ******.

  • ****: ***** ******** ****, all ******* ***********.
  • ****: ***** *** ** expensive *** ** *** specified ********* ***** ** many ***** ******.
  • *****: ********* ************, *** ****** ***** can ** $**, ** to ******** ***** ******* costing $*,*** ** ****.

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

******* *** '***** *********' sensors ***** **** **** common ** ****** *****. The **** ****** **** of ***** ****** ** the '**********' ******** **** ** a ****** ***** ** alarm **** ** *** frequency ************** ** ********** glass. ***** ******* *** used ***** **** ******* are ******* **** ****** rooms ** *******. *** exact ******** **** *** range ******* ** ******, but **** *** ****** wall-mounted ***** **** *** image *****:

******* **********-**** ******* *** used ** ********** ************, and ***** ******* ** install *** ********* ***** feature ****** ******* ******* to ******* ***** ******. In **** *****, *** directional ******** ** *** microphone ** ***** ** not ******* ** ****** like **** ******* ** trees ********, *** ** detect ***** ******, *********, or ***** ****** ***** climbed:

  • ****: ***** ******* *** be **** ******** **** configured ** ******** ***** on ******* ******, *** intrusion ******** *** *** always ******* '******** *****' or ********** *****.
  • ****: ** **** ** specified ********, ***** ******* can ** * *********** source ** ***** ******. Compared ** '***** *******', more '***** *******' *** typically ****** ** ***** the **** ****** *******.
  • *****: ******* ******* **** between $** - $** each, ******** ******* ***** specialty ********* *** ** $500 ** **** ****.

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

********** ********* ******** ** a ******** *******, *** only ******* ** *** harsh ******** *********** *** also ******* ** *** large ********* ***** ********. One ****** ****** ** using ** ********* ****** loop, ** * **** embedded **** ***** *** driveable *******. ** ********* loop ***** * ***** of ***** ********** ********* that **** ******* **** a ******** **** ****** through ** *** ******* the ****** ********* *****.

*** **** ******, ***** sensors *** ************* *** tasks **** ********** ************ or **** *********, *** are **** ****** *** detecting ******* ******** ** parking ****, ******** **********, or **********.

  • ****: ********* ***** *** reliable **** ********* ********, and *** ***** ** false ******** ** ********* or *******. **** *** easy ** ******* ** paved *****, *** *** cover ******** ** ****** feet.
  • ****: **** *** **** useful *** ********* *****. They **** *** ***** on ***** ******* *** require **** ******* *** typically ***** ******** ********.
  • *****: **** ***** **** less **** $***, *** larger (****** ****) ** more ********* (******* ******** objects) ***** *** **** $1000 ** ****.

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

***** ********,******** ********* ******* ** ***** ***** traditional ******** (** ******** door) ** ******/***** ****** can ** ****, **** building ******, *********, ** even ******* ********* *****. Pressure **** *** ********* used ******* ** *** unsecured **** ** * door ** ****** ** entrance ******* ** * locked *******.

* *** ******** ** pads ** **** ******* positional ********** *** **** maintenance **** ***** ****** types, *** *** *** alarm **** ****** ** ignored.

  • ****: ******** **** *** low ******* *** ************* pleasing, ***** *********** ***** carpet ** ***** ********. The **** **** *** trigger ***** ****** ****** an ****** ** * specific ****** ***** ** physically ******* **** ****.
  • ****: ******* **** ****** 'no ******' **. '**** weight', *** ******* ** heavy **. ***** *****. The *** ****** ********* requires ************ ** * stable, ********* ******* **** dirt ** ******** *** cannot ** **** ** gravel ** ****** *****.
  • *****: *** **** *** pads *** ****, ******* ranging **** $*** - $1000 **** *** ******* corridor ************, *** *** cost ***** ********* ** outdoor *** ** ***** coverage ***** **** **** ~40 ** **.

Comparison *****

*** ***** ********* ***** are ********** ** **** chart, ********* ** ***** of **** ** **** commonly ****.

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