[PSUBS-MAILIST] O2 regulator
Cliff Redus via Personal_Submersibles
personal_submersibles at psubs.org
Tue Jul 22 23:34:06 EDT 2014
I am working on two projects, the first is some mods to the R300. I have come to the conclusion that speed is an illusion for the mud holes of Texas. I am pulling the jet pump and drive train and ailerons and replace with four fixed MK-101's. Slower speed but better low speed maneuverability. Moving from 120VDC battery bank to 36VDC.
The new boat is a 1-atm, I person ADS designed for 500 fsw, pilot stands in a vertical position . Dry weight 2940 lbs with 30% ROB. Height 7'1", beam 6'6" draft 4'9", 200 SCF air/237 bar, 87 SCF O2/129 bar. 22" x 4" thick flat acrylic main viewport, three 8" side viewprots. Uses four MK-101 with kort nozzles, two vertical and two horizontal. Three axis joy stick. See attached pic. Battery pods low, upper pods are MBT. Uses a version of the pancake style vent valve you discussed at the last psub convention. Life support for 72 hours. Just finished all the electrical design, working on electrical penetrators. Working on designing the exterior PLC pod. FRP cowling, 0.25" A517-70 shell. Working on housing for 24V 5000 lumen LED lights. Will use seven of these. Life support/communication gear/PLC/touchscreen/scrubber similar to R300.
Need to retire again to work on this.
Cliff
From: via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Sent: Tuesday, July 22, 2014 9:30 PM
Subject: Re: [PSUBS-MAILIST] O2 regulator
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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