The way I understood it, it seems that you are only worried with gas
leakage if there is danger of explosion.

In my opinion, gas leaking and pooling in the basement is very worrying,
regardless of the O2 concentration.

I would install a sensor very close to the floor and replace it as often as
the manufacturer recommends.

Cheers,
Isaac

Em dom, 18 de ago de 2019 07:00, Art <ky1k@myfairpoint.net> escreveu:

> Hi All,
>
> I plan to convert to propane heat soon (live in Maine), but in
> preparation, for the switch I seem to have hit a brick wall.
>
> I want a decent flammable gas detector. It doesn't have to be extremely
> high quality or highly accurate-but.....
>
> Consumer grade flammable gas detectors on the market currently are only
> good for 2 years, and they are grossly overpriced. And, they don't come
> with schematics and the vendors for them seem to be generic no-name
> companies.  I found a vendor (OEM) in the US, called them and they
> didn't even know how it operated or the difference between oxygen and
> propane. And, the detectors also seem to detect other flammable gasses,
> though at different sensitivities!
>
> I'd rather build my own I think-especially since it's the only way to
> get the hardware that I want.
>
> I'd like a propane detector that also measures oxygen content of the
> atmosphere in the house as well. Propane is only flammable (explosive
> merely means fast burning) between oxygen concentrations between 2 and
> 10 percent mass, (per
>
> https://www.engineeringtoolbox.com/explosive-concentration-limits-d_423.h=
tml
> ).
>
>
> Youtube is full of Bozo's who don't have a clue about the need for
> oxygen before the mixture becomes flammable/explosive! And the videos
> they make just blow up a propane cylinder near an ignition source
> outside in free air.....so, the the 'explosions' lead the non-saavy
> types to believe propane safety is no big deal. But, houses that are
> totally destroyed from propane leaks clearly must have had proper fuel
> to air ratios-some are flattened right down to the foundation!
>
> The issue is further complicated because propane is significantly
> heavier than air. And, it's much colder than most air, so it sinks to
> the lowest layer of gasses (usually in the basement or lowest level
> floor of the building. SO, it doesn't mix with 'air' well. And, a layer
> of propane isn't dangerous unless it's mixed with air (oxygen).
>
> There was a time when I could research technical problems with search
> engines-but these days all I get are ads from retailers who offer them
> for sale! I use duckduckgo search engine, but even tried google-all the
> search engines seem to be trending towards being nearly useless with
> regard to technical issues.
>
> When I was working, I used to deal with pyrophoric and toxic gasses,
> including purge panels and vacuum systems needed for safety-so I'm not a
> beginner::>
>
> Can anyone suggest technical references on the web so I can evaluate
> whether to build or buy?
>
> GL to all and TIA!
>
> Art
>
>
>
>
>
>
>
>
>
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