[chbot] Oxygen / Argon sensor

[David Burkitt]

Why not simply fill the jar with water and have it inverted in a tank of
water and bubble the Argon in! The only thing displacing the water is Argon
so no water = 100% Argon.
Dave

On Mon, 8 Jun 2020 at 00:38, Trevor Wignall <zl3adz at gmail.com> wrote:

> A slightly more refined technique used in previous centuries is a canary
> in a cage. When it keels over, you know it isn't breathing oxygen.
>
> Argon is heavier than air,, but not dramatically so (40 rather than 28 for
> N2 and 32 for O2), so you could get significant mixing of the argon with
> room oxygen. (Good for the canary, not so good for your device.) Of course
> if the argon is also cold... Perhaps that is the trick - cool the argon and
> use a thermometer or thermocouple.
>
> Good luck.
> Trevor
>
> On Sun, Jun 7, 2020 at 11:41 PM Marshland Engineering <
> marshland at marshland.co.nz> wrote:
>
>> Car O2 sensors have to be hot to work. There are narrow and wideband
>> units.
>> Wideband needs a lot of electronics to get reasonable readings out.
>>
>> Simple method, place head in jar, if you can breathe - oxygen, if not
>> argon.
>>
>> Cheers Wallace
>>
>>
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