[chbot] Oxygen / Argon sensor

[Geoff]

Random ideas:

Weigh the jar as you put the argon in. My quick wikipedia-ing suggests the
difference in densities is half-a-gram per liter at STP, so you'll need an
accurate scale or a large volume jar to get an accurate measure.

How about a balloon that starts empty. Put the equipment in the balloon,
suck the air out, fill with argon.

Just how 'oxygen free' is required? Store immersed in oil like
lithium/sodium samples? Convert all oxygen to ozone? Store under a stream
of argon if only needed for short periods?

G
On 7 Jun 2020 8:33 PM, "Mark Atherton" <markaren1 at xtra.co.nz> wrote:

> I need to store a thermionic emitter in a jar which is free of oxygen, and
> just discovered that argon may an acceptable gas.
>
> Argon is heavier than air, so it may be as simple as filling a small
> vertical container with Ar, and placing the emitter at the bottom.
>
> I do need some simple instrumentation to tell me how full the container
> is, so can either be an argon or an oxygen detector.
>
> Just wondering if anyone has experience using a car oxygen sensor in the
> wild, or if there are any other readily available techniques which should
> be considered (lighted taper would work, but messy).
>
> Thoughts please.
>
> Mark
>
>
>
>
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