Replace Smoke / C0 Alarm. photoelectric vs ionization? - Page 2 - Canadian TV, Computing and Home Theatre Forums
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post #16 of 24 (permalink) Old 2019-07-29, 08:45 PM Thread Starter
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Ya they do but it goes by another brand name but its esentially the same gutz. Theres a retailer in the GTDA greater toronto and durham area that sells them for great prices too.
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post #17 of 24 (permalink) Old 2019-08-07, 09:17 AM
 
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CO2 detector mounting

A while back, the fire department did volunteer inspections of smoke/CO2 detectors in homes in our area.

I discovered that CO2 detectors need to be mounted near floor level as CO2 is heavier than air. One inspector told me with CO2 detectors on the ceiling, when levels get high, these things will trigger, but in a lot of cases when those dangerous levels are reached, it can be too late.

I was thankful for the fire department's visit and moved our CO2 detectors down to near floor level.

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post #18 of 24 (permalink) Old 2019-08-07, 09:43 AM
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Originally Posted by Gentleman View Post
I discovered that CO2 detectors need to be mounted near floor level as CO2 is heavier than air.
I assume you're talking about CO detectors, not CO2. CO has a density that is very similar to air (N2, O2, etc) and one should follow the installation instructions that are included in the user manual for that particular detector.

The molecular weights of CO and N2 are both around 28 with O2 being around 32. You can put in the formula and the following link will calculate for you.

https://www.webqc.org/mmcalc.php
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post #19 of 24 (permalink) Old 2019-08-07, 09:48 AM
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You beat me to the reply 57. Perhaps we need to update the title of the thread to CO to avoid the confusion.
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post #20 of 24 (permalink) Old 2019-08-07, 11:45 AM
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Another type of detector is for flammable gas. It will detect things like methane, natural gas and propane. These may accumulate at ground level due to a higher than air molecular weight. Propane is particularly susceptible to this. Anyone who uses propane for heat should probably have a flammable gas detector near ground level on the same floor as the furnace.
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post #21 of 24 (permalink) Old 2019-08-07, 12:01 PM
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Another type of detector is for flammable gas. It will detect things like methane, natural gas and propane. These may accumulate a ground level due to a higher than air molecular weight.
Methane has a molecular weight of 16, so is much lighter than air.

In Canada, Natural Gas has a composition of about 77% methane, with other heavier compounds, but is lighter than air.

https://www.e-education.psu.edu/fsc4...specifications

Propane is heavier than air and that's why underground garages don't allow propane vehicles.

Here are some typical gas densities:

https://www.engineeringtoolbox.com/g...ity-d_158.html

(Natural Gas is not a molecule but does have an approximate gas density based on the approximate composition of the molecules.)

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post #22 of 24 (permalink) Old 2019-08-07, 12:45 PM
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Thanks for the clarification. I knew that methane isn't heavier than air but knew that propane is. Wasn't sure about NG. In any event, the issue with propane stands. Maybe the inspector was confusing it with CO.
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post #23 of 24 (permalink) Old 2019-08-08, 08:07 AM
 
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57

Thanks. Yes I meant CO.

With all the global warming hype, I had CO2 on the brain.

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post #24 of 24 (permalink) Old 2019-08-09, 08:34 AM Thread Starter
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thanks for updating the post title, yes i meant carbon MONOxide not DIOxide
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