[PSUBS-MAILIST] Altimeter / barometer/ inclinometer

[Rick Patton via Personal_Submersibles]

Thanks Sean, good to know so I can set my alarms.
Rick

On Wed, Apr 22, 2020 at 10:09 AM Sean T. Stevenson via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Copied from the January 2020 release of the ABS rules:
>
> "
> 35 Life Support and Environmental Control Systems
>
> 35.1 General Life support systems are to meet the applicable requirements
> of this Section and Section 8.
>
> Submersibles are to be provided with equipment to generate, monitor and
> maintain suitable life support conditions inside the manned compartment.
> One atmosphere chambers/systems are to be designed so that the
> concentration of O2 (oxygen) will be kept within the limits of 18.0 to 23.0
> percent by volume and the concentration of CO2 (carbon dioxide) will never
> exceed 0.5 percent by volume.
> "
>
> 18% would appear to be the absolute lower permissible limit, but of course
> depending on how responsive your addition system is you would likely have
> to add with some margin on the way down so that you never hit that 18% in
> the worst case response. If you can do continuous control, then target the
> same 20.95% O2 that exists in atmospheric air, and alarm as appropriate so
> that you have time to respond to such an alarm without exceeding the limits.
>
> Sean
>
>
> -------- Original Message --------
> On Apr. 22, 2020, 13:55, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> Brian
> Nice looking 02 analyzer. I like the fact that is has a remote sensor. i
> am not sure what the proper minimum ppo2 % would be before adding o2, 19%?
> and I see markings on the face of the altimeter so what marking on the
> altimeter to the left of 0 would you consider needing to add 02?
> Rick
>
> On Wed, Apr 22, 2020 at 9:29 AM Brian Hughes via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> Rick,
>
> See link to pic. Yes, I plan to run both together. Magnet mounted, I can
> remove during transport or for storage.
>
> Brian
>
> https://www.instagram.com/p/B_S3gIeh-sp/?igshid=6fj01vvth4p5
>
> Sent from Outlook Mobile
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