sense / nonsense of CO monitoring

[Miyaru]

The whole idea is well beyond my paygrade. I'm no chemist or anything similar, and I hope that one will give you an answer - here, or someplace else. You suggested idea is oversimplified I think.

For

At room temperature, this reaction must be catalyzed. Details at https://www.enotes.com/homework-help/when-carbon-monoxide-combines-oxygen-what-produced-655293

CO is a potential fuel so it could be burned with oxygen to produce carbon dioxide, but not in a Nitrox situation.

....and that catalyst was already mentioned by @Wookie in post 9: hopcalite. Or in chemical terms: CuMn, Copper-Manganese.

The catalyst produces heat when converting CO into CO2. As long as the hopcalite remains free of moisture, it will do it's job theoretically forever.
Moisture-free is after the (MS-)filtration.

 

[Miyaru]

This is a ZE07-CO sensor connected to an arduino with an OLED display. With a box around it and a few lines of code you can build a CO analyzer for $15 to $20.
Cell lasts about 2 years and is replacable.

 

[Brett Hatch]

View attachment 586125 This is a ZE07-CO sensor connected to an arduino with an OLED display. With a box around it and a few lines of code you can build a CO analyzer for $15 to $20.
Cell lasts about 2 years and is replacable.

That's really neat! I had no idea CO censors were so cheap.

Have you considered making a combination CO + O2 sensor for rec nitrox use? Perhaps you could have 1 port into the machine, which forks to an O2 sensor on one side, CO sensor on the other, with each one dumping output to its own LED panel.

 

[Miyaru]

...
Have you considered making a combination CO + O2 sensor for rec nitrox use?
...

Yes I did, currently working on a O2/He/CO combined analyzer.
It's in the DIY section.

 

[wstorms]

Yes I did, currently working on a O2/He/CO combined analyzer.
It's in the DIY section.

same here, but seems you are a few steps ahead of me
will check out the DIY section