[PSUBS-MAILIST] O2 regulator

Sat Jul 19 16:01:09 EDT 2014

That's a great link Cliff, have bookmarked it.
I am wanting something to link to a plc & they have some treat options.
How come you didn't buy a unit with a wider range?
Phil's life support paper is saying we can take 3% for 1 hour, but the
range on the one you bought is 0 to 1%.
Sorry you aren't making it to Bellingham. It was a real treat seeing the R 300
in Florida.
Alan

Sent from my iPad

> On 19/07/2014, at 12:25 pm, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I use a K-30, part number SE-0018 , 0-10,000 ppm (0-1%) CO2 sensor from a company CO2 meters inc. The cost is $85 and it sends a 0-5 VDC output sensor.
> 
> http://www.co2meter.com/collections/co2-sensors/products/k-30-co2-sensor-module
>  Has worked flawlessly.
> 
> Cliff
> 
> 
> 
> 
> 
> Cliff Redus
> Redus Engineering
> USA mobile:  830-931-1280
> cliffordredus at sbcglobal.com
> 
> From: Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Friday, July 18, 2014 7:05 PM
> Subject: Re: [PSUBS-MAILIST] O2 regulator
> 
> 
> Cliff, What are you using for a CO2 sensor?
> 
> Thanks Pete
> 
> --------------------------------------------
> On Thu, 7/17/14, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Subject: Re: [PSUBS-MAILIST] O2 regulator
> To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Date: Thursday, July 17, 2014, 8:30 AM
> 
> 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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