[PSUBS-MAILIST] scrubber performance

Fri Feb 3 16:39:24 EST 2017

You should consider it. Hard anodizing is typically about 0.003" thick, comprising 0.0015" penetration into the base material and 0.0015" buildup.  Those numbers will never be exact of course, but serve as a useful rule of thumb for making adjustments to e.g. o-ring groove tolerances. Standard class 2A/2B threads shouldn't be an issue, but if you are using tighter thread tolerances, you may need to adjust that also.

Sean

On February 3, 2017 10:05:28 AM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Cliff,                 Will I have to worry about threads or o ring
>tolerances after the process?   
>
> 
>
>Brian 
>
>--- personal_submersibles at psubs.org wrote:
>
>From: Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>Date: Fri, 3 Feb 2017 10:45:26 -0600
>
>Brian, I am not a corrosion expert but have found that hard anozizing
>(Mil-A-8625 type III) seems to work fine for my parts.  My experience
>is that PSUB stuff gets banged around a lot so addeded thinckness and
>hardness that comes from Mil-A-8625 type III seems to work out better. 
>Most of my marine experience has been in fresh water lakes so we really
>need to get someone with a lot of saltwater experience to chime in. 
>Also most psubbers don't leave their boats in the water all the time
>and rinse off the boat after use.  This also tends to mitigate
>corrosion.
>
>
>Cliff
>
>
>On Fri, Feb 3, 2017 at 9:50 AM, Brian Cox via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Cliff,   Is the Mil-A-8625 type III class 2 black  anodizing sufficient
>for exposure to sea water?  Using 6061 aluminum. 
>
> 
>
>Brian
>
>
>
>--- personal_submersibles at psubs.org wrote:
>
>From: Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] scrubber performance
>Date: Fri, 3 Feb 2017 09:30:18 -0600
>
>Sounds like you are having fun coming up to speed on PLCs. Get your
>wife to take the video of your hand waving.  We would all appreciate
>the entailment value!  It a lot of fun to bench test components being
>operated by PLC and see them come to life based on your code.  As to
>compass heading, roll, pitch and yaw sensor, I use the Ocean-server
>http://www.ocean-server.com/compass.html   OS5000-S Solid State tilt
>compensagted 3 axes digital compass,  This is a RS-232 serial device.
>You have to write some PLC ladder logic code to parse the ASCII string
>sent to the PLC to extract the data,  I packaged mine in a small 1-atm
>aluminum anadoized pod about the size of a tennis ball that I have
>mounted outside the steel pressure hull behind the pilot.  Even though
>the DoMore CPU you are using has several serial input ports that could
>be used for this sensor, I ended up getted a dedicated coprocessor
>module that plugs into one of the AutomationDirect PLC bases that
>enables me to write the parsing code in BASIC and enables me to
>dedicate the coprocessor to this sensor.  It took me a while to come up
>to speed on RS-232 comuncations but I now have this working petty much
>bullet proof.  The coprocedssor then sends the heading, pitch, roll and
>yaw values to the PLC cpu to be used any way you want them.  Currently,
>I am only using this data on my HMI.
>
>Cliff
>
>
>On Fri, Feb 3, 2017 at 12:52 AM, David Colombo via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>Hi Cliff,
>
>Its been slow going as I am finishing building my home. Should be
>finished in 45 days. But I have been making progress as I learn PLC
>coding and ladder logic in the evenings. Currently I am working thru
>the flight Joy Stick switch controls combined with a 4 position
>joystick base to control the (2) forward canard wings, (2) vertical
>thrusters  (2) horizontal thrusters, and (2) vectored rear thrusters to
>have a flight experience. I spend many hours in the evening when my
>wife is not looking waving my hands thru the air simulating flight and
>then coding the switches needed to make the maneuver. I'm sure it would
>be entertaining to record a video.  I am curious, are you using any
>gyroscopic sensors for pitch and roll? I'm thinking I need to have some
>build into the coding so as to limit my human abilities as safety
>overrides. 
>
>The next step is to get a bench setup with the joystick and canard
>wings to run tests on the coding and for flight training purposes. Just
>need to finish the house first. Mean while I'll be waving my hands in
>the air for a while.
>
>
>
>
>Best Regards,
>David Colombo
> 
>804 College Ave
>Santa Rosa, CA. 95404
>(707) 536-1424
>www.SeaQuestor.com
>
>
>On Thu, Feb 2, 2017 at 8:04 PM, Cliff Redus via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>David, hope that you have made some progress on the design work for
>SeaQuester. When I first installed life support on the R300, I had
>sensors distributed all over the boat.  What I have move to is
>packaging all the Life Support related sensors in a single electrical
>box I call the AMOC module.  AMOC is an acronym for Air Management and
>Oxygen Control. This made it easier to maintain the system and made it
>easy to bench test. I feed HP O2 from an external tank to this box.  It
>in turn breaks the pressure and emits the O2 to keep the mole percent
>balanced.  The PLC interfaces with the AMOC unit to monitor and control
>the air in the cabin. If you are interested, send me your email address
>to cliffordredus at sbcglobal.net and I will send you the DCI for the
>drawings associated with the AMOC  unit and the drawings.  The axial
>flow scrubber I use is the same one Alec used for Snoopy.  It has
>worked great. The PLC ladder logic code around the life support system
>is pretty straight forward.  What I like about the system is that it
>automatically compensates for different sized humans in the boat but
>yet retains a manual mode in the event both the main and auxiliary
>power are lost.  The assembly drawing for the AMOC unit details all the
>sensors as well as all the Swagelok fittings and circular disconnect. 
>This unit should work well with the AutomationDirect DoMore CPU you
>have.
>
>
>Cliff
>
>
>
>On Thu, Feb 2, 2017 at 7:50 PM, David Colombo via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Cliff, Thanks for answering the question I was just going to ask.  Did
>you build any special case to mount for replacement? I need to back and
>see the line of code you used so I can use it in my DoMore PLC
>
>
>Best Regards,
>David Colombo
> 
>804 College Ave
>Santa Rosa, CA. 95404
>(707) 536-1424
>www.SeaQuestor.com
>
>
>On Thu, Feb 2, 2017 at 2:46 PM, via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>I have had good performance from this company but with their K30
>sensor.  $85 and does give 0-5v analog output signal.  It span is
>0-10,000 ppm (0-2%).
>
>
>Cliff
>
>Sent from my iPad
>
>
>On Feb 2, 2017, at 2:37 PM, River Dolfi via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>I did side-by-side tests on several low-cost ambient CO2 sensors when I
>was doing air quality instrumentation work, and I eventually settled on
>these units from COZIR. 
>http://www.co2meter.com/products/cozir-0-2-co2-sensor
>
>They're only about $70US, have built in self calibration, super
>reliable, and have very low current draw compared to other sensors. The
>big rub is that it isn't analog output, but serial.
>
>You would have to interface it with a microcontroller (which is an easy
>enough job with a $20 Arduino) and have it set up to display to an LCD,
>trip an alarm at critical levels, possible demand control of the
>scrubber, other sensors, etc.
>
>I have an identical system built for the health department currently
>running 70 (70!!!) of these sensors and others on battery power across
>the city in the elements. They are that good.
>
>
>I recently found about half of a medical scrubber in a dumpster, so
>I've been thinking about life support lately.
>
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