Re: Carbon Monoxide

Bob Wood wrote:
> On Thursday, September 28, 2006 7:06 PM [GMT+1=CET],
> Captain Beeky <captain.beeky-AJ91bsLKfcsqdlJmJB21zg@xxxxxxxxxxxxxxxx> wrote:
>
>
>> Is CO heavier than air ?
>>
>> Let me get this right - smoke detector better mounted ceiling level.
>> Gas detector better mounted floor level. Where to put the CO
>> detector, ideally ?
>
>
> From:  http://chemistry.about.com/library/weekly/aa092202a.htm
>
> Where Should I Place a Carbon Monoxide Detector?
>
> Because carbon monoxide is slightly lighter than air and also because
> it may be found with warm, rising air, detectors should be placed on
> a wall about 5 feet above the floor. The detector may be placed on
> the ceiling. Do not place the detector right next to or over a
> fireplace or flame-producing appliance. Keep the detector out of the
> way of pets and children. Each floor needs a separate detector. If
> you getting a single carbon monoxide detector, place it near the
> sleeping area and make certain the alarm is loud enough to wake you
> up.

Sounds spot on advice to me.  Density is proportional to molecular weight 
for a gas
Nitrogen = 28
Oxygen = 32
Air is therefore 4 parts N2 and 1 part O2 = approx 29 effective
CO = 28
CO2 = 44

So CO tends to rise (and  warm air rises as well).

Our CO detector is 12" below ceiling.

Ron Jones
Process Safety & Development Specialist
Don't repeat history, unreported chemical lab/plant near missesa at
http://www.crhf.org.uk Only two things are certain: The universe and
human stupidity; and I'm not certain about the universe. ~ Albert
Einstein 




 
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