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

[Hugh Fulton via Personal_Submersibles]

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/ 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

rwd5301 at psu.edu

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