[PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot Fish

[Sean T. Stevenson via Personal_Submersibles]

Could you isolate the CO sensor behind a bed of hydrogen catalyst to remove the influence of the hydrogen on the reading? Something like Sofnocat?

Sean


On November 15, 2016 7:50:04 PM MST, River Dolfi via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I've actually spent the last 3 years developing novel gas sensors in
>several air quality laboratories, so I guess I could say I'm somewhat
>of an
>expert.
>
>Antoine, do you have a link for your sensors? I suspect they are
>electro-chemical cells, which I've worked with extensively. The bad
>news is
>the cross sensitivity, the good news is that the behavior is rather
>linear,
>and using a second semiconductor based sensor sensitive to just
>hydrogen
>one can just subtract one from the other to find true CO.
>
>Or you could try a low cross sensitivity electro-chemical cell. Here is
>a
>manufacturer in the UK who I've worked with and can vouch for their
>products quality http://www.alphasense.com/index.php/air/ They're CO
>sensor
>claims a cross sensitivity to H2 of <4%
>You do need a driver circuit to read the sensor and output an analog
>voltage, but they sell those as well.
>
>Carsten, if you've ruled out batteries, electrical issues, and the
>occupants I think you're issue might be the off gassing of VOC's
>(volatile
>organic compounds) from the remaining solvent in your interior paint.
>They
>will definitely give you a headache, or get you really high. If that is
>the
>culprit, your best course of action would be to vacuum cure the paint.
>Draw
>as high a vacuum as you can sustain inside the sub and hold it there
>over
>night. Thankfully, this should be pretty easy in a submarine.
>
>One of these days I might get the time to draw up plans for a community
>life support sensor suite. Only a few more months of university left...
>
>-- 
>-River J. Dolfi
>
>rdolfi7 at gmail.com
>rwd5301 at psu.edu
>
>
>------------------------------------------------------------------------
>
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