Smoke and CO Detector Combo

By Brian Rhodes, Published May 01, 2013, 08:00pm EDT (Info+)

A new detector claims to do twice the work of its competitors. In response to growing legislation requiring carbon monoxide (CO) detectors in new construction, manufacturer System Sensor has developed a detector that combines both smoke and CO detection in a single unit. The company claims that its combo design reduces wire and installation costs by 'killing two birds with one stone'. However, does that claim hold under examination? In this note, we look deeper.

The Laws of CO Detection

***** ***** ********* **** **** * mainstay ** *** ************ ***** *** 1970's, *** **** ********* ********* ** detection **** ********* **** ******.

***** ****** ** ****, ******* *********** ********* *** **** ***** ** CO ******** *********, ************, *** *********** in *********. ** *** ** *****, 40 ** ** ****** ******* ** detection ** *** ** **** ********* (building) *****. ***** *** ***** ************ vary, **** ***** **** ******* ** in *****-******* ***********, ********* *********:

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

******* *** **, "**** *********" *** life ****** ******* *** ** ** detectors ** ****. *** *******, **** Canadian ********* [**** ** ****** *********] require *** ** ********* ** ***** residence *** ***** ********* ********** ** rating.

Product *******

****** ******'* '** **/*****' ******** ******** a ************* ***** *** ** *******-******** CO ****** **** * ****** **** or ******* ***** *******. *** ************'* promo ***** ***** ******** ** ******** of *** ****** *** **'* ********* 'interface ******' **** ***** ** ** tied **** ****** ***** ******:

*** ****** ** ********* ** ****** 2 ** * **** *******, *** is ******* *** ** ** ** VDC **** *** *****. * ****** uses * ** * ***** *** panel; *** **** ************* *** ***** and ** ******, *** ** ******** supervision ** *********** ****.

** ***, ******* **** ** ********* with ********* '********* *******' ** *** main ***** ***** **** ******* ***** type ** ***** *** ******** ** sending *** ********** *****-**** ******** ** one **** **** **** *****.

*** **** ******, ******* * *** 8 ******* *** ****** ** ***** all ***** ******. ** ********* ****** allows ******** ** ** * *****, and ****** ********** **** ******* ******** interfaces.

****** *************** *** ********* ** ****** vary ********* ** ****** ***** *** local ***********, *** **'* *************** **** sensor ** ******** ** ** ******** every * *****. *** ****** ***** an '*** ** ****' ******* ** the ********* ****** ** **** ** advance ** **********.

*******

****** ****** ***** ******* ******* ****** channels, *** ******** ******* ** ******* to ***** *******, *** ****** ******* for ** ********** ** ******:

  • $** *** ** ***** ****** **** [link ** ****** *********]
  • $** *** *** ********* ** ********* Module [**** ** ****** *********]
  • *********** **** ** $** *** ** module

Why ***** *****?

*** **** ***** ** *** ***** sensor ** ********* **** ******* *** less ************ ***** **** ******* ******** devices. ***********, ***** *** ** **** between ** - **% **** **** installing ******** *******. ***** *** **** of *** ****** ** ~***% ****, half *** ************ ***** *** **** than **** *** ***** ******* ** required. *** *** ******* * ****** system ****** **** **** ****:

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

  • * ***** ********* @ $** **** = $***
  • * ** ********* @ $** **** = $***
  • ** **** ** *-**** *******, **' each @ $*.**/** **** = $***
  • ** ******* ** ************ *** ******, @ $**/** **** = $***

***** ****: ~$****

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

  • * ***** ***** @ $** **** = $***
  • * ********* ****** @ $** **** = $**
  • * **** ** *-**** *******, **' @ $*.**/** **** = $***
  • ** ******* ** ************ *** ******, @ $**/** **** = $**

***** ****: ~$***

*** ********* ******* ***** ***** **** discrete ******* ** ***** $** *** job. * **** ****** ********* *** save **** $**,*** ****** *** ****** of *** ****.

Risk ** ****** *********

***** **** *** ********* **** ********** of * ***** ******, *** ****** of ****** ** * ***** ** disagreement ***** ***********: **** * ******* mounted ** ****** ****** ** ********** as * **** ******* ******?

*** ***** ************* ** ***** ** this *****. ***** ****** ********** ****** like ** *** *** ******* ******* mount ********* *** ***, ******* ******** sources ******** **** ******** ** *********. While **'* ******* ** **** ** less ***** ** *** (********), ** cools (*** *****) ** * ****** rate. *** **** ******, **** *********** suggest ******* ******* ********* *** **** protective **** ***** ******* ** ****** heights, ******* ** *********** ** ******* concentrations ****** ********** ******.

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

*** *********** ** ********** *********** ****** who **** ************ ******* *** ******* smoke/CO *********, *** ** ***** ****** does *** ***** ********** ****** ** switch **** ********, *** **** *********, devices.

*******, *** ***** ********* *** ********* install *** ******* ***** *********, ***** is *** ********* ** **** ********* of ******* ** * ****-****** ********. Likewise, *** ******** ***** ********** ********* are *****, ** *** ******* **** schedule ****** ** ******* **** ***** and ** ********* ** * ****** action, *** **** ******** *** ***** of ************ ***** *** **** ********** the ********** *********** ** ******* **** at * ****** ****.

Comments (4)

I see one possible problem with logistics right off the bat. Is the CO replacement cartridge in actuallity the shelf life or activation life? You could theoretically have a replacement cartridge manufactured the same time as these new dual detectors but sit on the shelf for 6 years. The replacement is then ordered and installed to replace a sensor that is the same manufactured age. This was one of the problems we ran into when replacing wireless CO detectors. Usually the replacement was older than the used one and frequently gave us false detection or no detection when tested.

The answer is definitely shelf life. I brought the question up to the manufacturer, and he said the internal distribution policy is to rotate stock so that a given replacement gives a minimum of 6 years in the field, and they 'have a rather liberal policy' on exchanges before the guaranteed date.

However, you point is valid and plausible, and worth noting. I'll update the post accordingly.

Thanks for reading!

I'm not sure what this article has to do with video surveilance

Jerry, it has nothing to do with video surveillance. We have been expanding into the rest of security in the last year. For instance, we now have 50+ access control articles and are running our first access control course.

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