[PSUBS-MAILIST] O2 regulator

Tue Jul 22 21:14:47 EDT 2014

On the R300, I use a MAX-250 O2 sensor from Maxtec. While this has worked fine, it is just the sensor element.  You need a circuit board to convert to 0-5 VDC analog signal the PLC can take as an input.  I had a friend design and fabricate the board several years ago.

For the new boat I am designing, I like the UV-FLux 25% sensor from CO2 meters inc.   http://co2meters.com/Documentation/Datasheets/DS-CM-0201-UV-Flux.pdf    This sensor will handle 0-25%.  The sensor output is 3.3V TTL level RS232.  All PLCs will have a RS232 port.  I would have preferred the output to be an analog voltage output of 0-5 VDC like the CO2 sensor from them I use but this will work ok.  With this sensor you can connect directly to PLC.

http://co2meters.com/Documentation/Manuals/Manual-CM-0201-UV-Flux-Oxygen.pdf is the manual for the sensor.

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: Tuesday, July 22, 2014 5:54 PM
Subject: Re: [PSUBS-MAILIST] O2 regulator

Cliff, I forgot to ask. What are you using for an O2 sensor ?

Thanks Pete  --------------------------------------------
On Sat, 7/19/14, Alan 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: Saturday, July 19, 2014, 1:01 PM

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 therange 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 300in
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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