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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Carsten,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Just a thought, that if you have internal batteries or engine oils etc and you lower the cabin pressure then there is a possibility of any liquid or gel giving off more gas with the lowered ambient pressure. Is this a possibility? i.e. if you had a vacuum then they would boil. Hugh<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>River Dolfi via Personal_Submersibles<br><b>Sent:</b> Wednesday, 16 November 2016 3:50 PM<br><b>To:</b> personal_submersibles@psubs.org<br><b>Subject:</b> Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot Fish<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>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.<o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>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.<o:p></o:p></p></div><div><p class=MsoNormal>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 <a href="http://www.alphasense.com/index.php/air/">http://www.alphasense.com/index.php/air/</a> They're CO sensor claims a cross sensitivity to H2 of <4%<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>You do need a driver circuit to read the sensor and output an analog voltage, but they sell those as well.<o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><div><div><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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...<br clear=all><o:p></o:p></p></div><div><p class=MsoNormal><br>-- <o:p></o:p></p><div><div><p class=MsoNormal>-River J. Dolfi<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><a href="mailto:rdolfi7@gmail.com" target="_blank">rdolfi7@gmail.com</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:rwd5301@psu.edu" target="_blank">rwd5301@psu.edu</a><o:p></o:p></p></div></div></div></div></div></div></div></div></div></div></div></body></html>