[PSUBS-MAILIST] O2 regulator

Tue Jul 22 22:30:57 EDT 2014

New boat?

Vance

-----Original Message-----
From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Tue, Jul 22, 2014 9:15 pm
Subject: Re: [PSUBS-MAILIST] O2 regulator

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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