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

[River Dolfi via Personal_Submersibles]

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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