<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">Sean Bingo! Nice idea. :-) we will do so.<br /></span></p>
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<p style="margin: 0px;"><span style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">River dolfi : </span></p>
<p style="margin: 0px;"><span style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">I vaccum in the sub overnight will destroy to much systems - including damage the batteries. </span></p>
<p style="margin: 0px;"><span style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">The paint is 6-8 years old two component epoxy paint. </span></p>
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<p style="margin: 0px;">Betreff: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot Fish</p>
<p style="margin: 0px;">Datum: 2016-11-16T04:21:16+0100</p>
<p style="margin: 0px;">Von: "Sean T. Stevenson 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 dir="ltr" style="margin: 0px;">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?</p>
<p dir="ltr" style="margin: 0px;">Sean</p>
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<div class="gmail_quote">On November 15, 2016 7:50:04 PM MST, River Dolfi via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div>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.<br /><br /></div>
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.<br /><br /></div>
<div>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%</div>
<div>You do need a driver circuit to read the sensor and output an analog vo! ltage, but they sell those as well.<br /><br /></div>
<div>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.</div>
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<div class="gmail_extra">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...</div>
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