[chbot] Oxygen / Argon sensor

[Daniel Powell]

Narrowband O2  will only read rich, lean or stoich. And I would suggest useless in your environment.

Wideband will give you considerably more flexability but require filtering and amplification. There are reasonable cost innovate or diy wideband amplifiers. I've previously ran the innovate lc1, which has an analog gauge and serial outputs. I currently run a wideband to canbus amp.

I've always run a Bosche wideband sensor. I don't know if it'll have issues with an insert gas, but I do know they have issues with lead and ethanol fuels.

Daniel

Daniel

________________________________
From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> on behalf of Mark Atherton <markaren1 at xtra.co.nz>
Sent: Monday, June 8, 2020 12:34:01 PM
To: chchrobotics at lists.ourshack.com <chchrobotics at lists.ourshack.com>
Subject: Re: [chbot] Oxygen / Argon sensor

David, hello, hope you are well !

The electron-source in question needs to be kept dry, but  I do like your idea.

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.

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.

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.

David's suggestion gives me a simple method to calibrate the metering process.

Thank you everyone for suggestions.

-Mark


On 8/06/2020 12:00 PM, David Burkitt wrote:
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<mailto: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<mailto: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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