[PSUBS-MAILIST] O2 regulator

Fri Jul 18 20:25:01 EDT 2014

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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