<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><title></title></head><body><p style="margin: 0px;"><span style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">Normally we have a slightly higher cabin pressure by leaking HP air lines.. <br /></span></p>
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<p style="margin: 0px;">-----Original-Nachricht-----</p>
<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot Fish</p>
<p style="margin: 0px;">Datum: 2016-11-16T04:23:57+0100</p>
<p style="margin: 0px;">Von: "Hugh Fulton via Personal_Submersibles" <personal_submersibles@psubs.org></p>
<p style="margin: 0px;">An: "'Personal Submersibles General Discussion'" <personal_submersibles@psubs.org></p>
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">Hi Carsten,</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</span></p>
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<p class="MsoNormal"><strong><span lang="EN-US" style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';">From:</span></strong><span lang="EN-US" style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <strong>On Behalf Of </strong>River Dolfi via Personal_Submersibles<br /><strong>Sent:</strong> Wednesday, 16 November 2016 3:50 PM<br /><strong>To:</strong> personal_submersibles@psubs.org<br /><strong>Subject:</strong> Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot Fish</span></p>
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<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.</p>
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<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.</p>
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<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%</p>
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<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.</p>
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<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.</p>
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<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...</p>
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<p class="MsoNormal">-River J. Dolfi</p>
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<p class="MsoNormal"><a href="mailto:rdolfi7@gmail.com">rdolfi7@gmail.com</a></p>
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<p class="MsoNormal"><a href="mailto:rwd5301@psu.edu">rwd5301@psu.edu</a></p>
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