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

[MerlinSub@t-online.de via Personal_Submersibles]

Normally we have a slightly higher cabin pressure by leaking HP air lines..
 
 
 
-----Original-Nachricht-----
Betreff: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot 
Fish
Datum: 2016-11-16T04:23:57+0100
Von: "Hugh Fulton via Personal_Submersibles" 
<personal_submersibles at psubs.org>
An: "'Personal Submersibles General Discussion'" 
<personal_submersibles at psubs.org>
 
 
 

Hi Carsten,

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

 

From: Personal_Submersibles 
[mailto:personal_submersibles-bounces at psubs.org] On Behalf Of River Dolfi 
via Personal_Submersibles
Sent: Wednesday, 16 November 2016 3:50 PM
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot 
Fish

 

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 
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 <mailto:rdolfi7 at gmail.com>

rwd5301 at psu.edu <mailto:rwd5301 at psu.edu>


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