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<div class="moz-cite-prefix">David, hello, hope you are well !</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">The electron-source in question needs
to be kept dry, but I do like your idea.</div>
<div class="moz-cite-prefix"><br>
</div>
Current thought is to gently fill a thin, vertical plastic
containerawith Ar, drop in the electron-gun, and tighten up the lid.
If I can somehow meter the gas, and overfill by 100% things should
be OK. The thermionic source should be at the bottom of the
container.<br>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">In terms of acceptable levels of
oxygen, no idea. Electron-guns 'are poisoned quickly' in the
presences of oxygen, but that should be taken within the context
of a normal, service life of maybe 10 years.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">I am hoping that storage in Ar will
extend the life on an EG from a few hours in air, to a few months.
Just have to move swiftly when transferring it into the bell-jar
before evaluating the whole mess.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">David's suggestion gives me a simple
method to calibrate the metering process.</div>
<div class="moz-cite-prefix">
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">Thank you everyone for suggestions.<br>
</div>
<div class="moz-cite-prefix"><br>
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</div>
<div class="moz-cite-prefix">-Mark</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 8/06/2020 12:00 PM, David Burkitt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALOBscbUEQKg-DnYdaHVSaCH_VtsX-pC9mVOxkG_O=pb=qs_4Q@mail.gmail.com">
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<div dir="ltr">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.
<div>Dave</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, 8 Jun 2020 at 00:38,
Trevor Wignall <<a href="mailto:zl3adz@gmail.com"
moz-do-not-send="true">zl3adz@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">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.
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Good luck.</div>
<div>Trevor</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jun 7, 2020 at
11:41 PM Marshland Engineering <<a
href="mailto:marshland@marshland.co.nz" target="_blank"
moz-do-not-send="true">marshland@marshland.co.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Car O2 sensors have to
be hot to work. There are narrow and wideband units.<br>
Wideband needs a lot of electronics to get reasonable
readings out. <br>
<br>
Simple method, place head in jar, if you can breathe -
oxygen, if not argon. <br>
<br>
Cheers Wallace<br>
<br>
<br>
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