[PSUBS-MAILIST] O2 regulator

Thu Jul 17 11:59:58 EDT 2014

Alec,
Reading this, do you have any details of your OTS radial filter that Cliff
mentions?
Thanks
James

On 17 July 2014 16:30, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank
>
> On the R300, I have life support module I call the AMOC system (Air
> monitoring and Oxygen Control).  Connected to the box is a 1/4" SS tubing
> with Swagelok fittings connected to a O2 supply from an external 2200 psig
> O2 bottle. I fill this with welding O2 with a whip.    In the AMOC module
> is a medical pressure reducing regulator (Hudson model 2000).  This
> regulator  reduces the pressure to around 5 psig.  The pressure downstream
> of the regulator is adjustable with a maximum rate of 15 SLPM.  The porting
> on this regulator is two 1/4" NPT HP ports and one LP port.  Downstream of
> this regulator, I have installed an O2 thermal mass meter/ controller from
> Porter.  The model number is 201-FSVP.  This controller can be set from
> 0-10 SLPM via an 0-5V analog input signal. Max pressure on the O2
> controller is 25 psig.  This O2 controller also sends out at 0-5V analog
> output signal of the O2 SLPM flow rate.
>
> Both these items were purchased on Ebay at a fraction of list.    I have
> been very happy with the performance of these units.  By measuring the O2
> and CO2 percentages in the cabin, I have a PLC that opens and closes this
> controller to keep the cabin O2 % between 19-22%.  ABS regulations requires
> that the O2 be held with in 18-24%.  The advantage of this system is that
> it automatically accounts for different metabolic consumptions rates for
> O2.  In the AMOC unit, I have a Swagelok needle valve in a bypass around
> this controller so that if both main and back up power are lost, the pilot
> can manually adjust the O2 rate into the boat.
>
> The second part to controlling the atmosphere in the cabin is scrubbing
> the CO2.  I initially used a axial flow filter with SodaSorb HP.  I found
> that the axial flow filter did not work very well with CO2 in the cabin
> ranging from 0-7000 ppm.  Part of the problem was the axial filter
> arrangement and part of the problem was the blower was not strong enough.
> At the 2012 PSUB convention in Vancouver, Alec Symth brought the
> scrubber he was using on Snoopy as a show and tell.  His scrubber is an OTS
> radial filter that is used to clean air.  In 2013, I switch to this type of
> scrubber/filer again with SodaSorb HB and the scrubber has worked much
> better.  It consistently keeps the CO2 level below 2000 ppm with most of
> the time it being 1000-1500 ppm.  ABS rules require that you keep O2
> concentration below 5000 ppm.  Part of the reason that is works better is
> the radial design which minimizes the pressure drop through the Sodasorb
> and part is that I have switched to a stronger blower.
>
> Long answer to short question.
>
>
> Cliff
>
>
>
>
>
>   On Thursday, July 17, 2014 9:27 AM, hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi All,
> I need to find a pediatric flow meter and regulator for Gamma.  Or is
> there something better?
> Hank
>
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