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

[MerlinSub@t-online.de via Personal_Submersibles]

Sean Bingo!  Nice idea. :-)   we will do so.
 
River dolfi :
I vaccum in the sub overnight will destroy to much systems - including 
damage the batteries.
The paint is 6-8 years old two component epoxy paint.
 
 
 
 
-----Original-Nachricht-----
Betreff: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot 
Fish
Datum: 2016-11-16T04:21:16+0100
Von: "Sean T. Stevenson via Personal_Submersibles" 
<personal_submersibles at psubs.org>
An: "Personal Submersibles General Discussion" 
<personal_submersibles at psubs.org>
 
 
 
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/
  <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 vo!
  ltage, 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...
   

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