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

Wed Nov 16 16:39:11 EST 2016

Hello all,

River,
yes I used electrochemical sensor, I used a non H2 compensated CO sensor
(Honeywell Gas alert extreme O2, H2S, CO, LEL), with 40% cross sensitivity

as well as a H2 compensated CO sensor GasAlertExtreme, the cross
sensitivity drops down to 5% thanks to a selective H2 catalyst in front of
the cell. Some sensors work differently I heard, using two cells with
different sensitivities, and the sensors mathematically backs out the
levels of H2 and CO (which is basically what i did by hand with two sensors)

Sean, I dont think  sofnocat would correct CO reading for H2 because
sofnocat removes both CO and H2...

mold generating mycotoxins and VOCs: good lead... Hopefully the active
charcoal filter takes care of that... but it seems mold gives off spores
which could create also allergies, which would not be filtered by active
charcoal i think.

James: for the paint I just closed the sub for a few weeks outside in
summer, so the temperature gets quite warm. then measured CO content after
that... it was zero.

Carsten, if you have a doubt about CO given its lethal potential, just rush
to the hospital (one with a hyperbaric chamber preferably) after a long
dive to request arterial COHb blood test. if over 5% (as non smoker) with
some loss of balance symptoms, you ve been toast with CO. and may deserve
some pure oxy breathing.
Smokers become more resistant to CO poisoning, their hemoglobin CO level
can be above 5% without having damage to the brain. First time in my life I
heard I could train myself to something by smoking!!! perhaps your friends
are smokers and you are not. any vision impairments?

VOCs: why not. In the lab at my work some technicians are way more
sensitive to some solvents than others technicians. But for many of these
vapors, someone will notice the smell at a level lower than at the
threshold for headache and nausea.
the book about airborne pollutants in space is a good ressource on those.
Carsten do you have active charcoal filters for your cabin air?

cheers,
Antoine

On Wed, Nov 16, 2016 at 5:54 PM, MerlinSub at t-online.de via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Sean Bingo!  Nice idea. :-)   we will do so.
>
>
>
> River dolfi :
>
> I vaccum in the sub overnight will destroy to much systems - including
> damage the batteries.
>
> The paint is 6-8 years old two component epoxy paint.
>
>
>
>
>
>
>
>
>
> -----Original-Nachricht-----
>
> Betreff: Re: [PSUBS-MAILIST] ill after a Psub Weekend AW: Project Pilot
> Fish
>
> Datum: 2016-11-16T04:21:16+0100
>
> Von: "Sean T. Stevenson via Personal_Submersibles" <
> personal_submersibles at psubs.org>
>
> An: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>
>
>
>
>
>
>
> 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?
>
> Sean
>
>
> On November 15, 2016 7:50:04 PM MST, River Dolfi via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>>
>> 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 vo!
>> ltage, 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...
>>
>>
> 
>
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