[PSUBS-MAILIST] At Home O2 Cleaning Process

Sun Jan 7 15:21:18 EST 2018

Brian, in my (Air Monitoring, Oxygen Control) AMOC system, I use a Porter
201-FSVP mass controller.  Ebay has these units for sell all the time at
pennies on the dollar. These unit will both measure the mass rate of the
gas in SLPM and also control it. There are two 0-5VDC control signals for
the unit.  For this partuclar unit which has a 0-10 SLPM span, if you give
the controller pin 5V, then it will pass 10 SLPM if you give it 0V, it will
pass zero SLPM.  The other singal is an analog voltage output signal again
5Vdc for full span, would be a measured 10 SLPM and a zero signal means it
is reading zero mass flowrate of gas.
https://www.ebay.com/itm/Porter-201-AFASVPAA-Mass-Flow-Controller-10-SLPM-760-Torr-MFC/232159305887?hash=item360dc5e09f:g:BTAAAOSwmrlUrcG1
is a link to ebay for a unit very close to this.  Porter (Parker) make a
ton of different  controller for different rates and different gasses.  The
controller as a 9 pin blade style connector that is used widely in the
medical industry.  The documentation on these meters is excellent and you
can download it
https://www.parker.com/literature/MFM%20&%20MFC%20(D-Conn.)%20(FM-898%20Rev.%20E).pdf
.  The manual calls out the spec for the connector.  I use this unit with a
PLC but single it is analog voltage signals, you could control with
potentiometer off a 5VDC source.  Likewise you could use an analog display
that would take a 0-5VDC signal if you wanted. I have found these units to
be very reliable.  In my Life support system module, I use a Swagelok a
Vernier needle valve model SS-SS4-VH as a bypass around this controller for
manual O2 bleed control.  As a backup, I use a variable area meter like
https://www.amazon.com/dp/B019YS4PSG/ref=asc_df_B019YS4PSG5328541/?tag=hyprod-20&creative=395033&creativeASIN=B019YS4PSG&linkCode=df0&hvadid=198097951144&hvpos=1o1&hvnetw=g&hvrand=6957636125906653374&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027968&hvtargid=pla-542207540152
.

Cliff

On Sat, Jan 6, 2018 at 1:56 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I just talked to my local dive shop and they will fill O2 no questions
> asked .  They say they do it all the time.  I'm thinking of getting set up
> with a package from DAN  Here:
>
>
> https://www.diversalertnetwork.org/dive-store/?catno=9
>
>
> It seems to be somewhat problematic getting the right all the components
> but getting one of these units from the DAN website might make things
> easier as far as getting bottles filled and so forth.  The delivery system
> on these units I don't think has enough fine tuning ability however.  Does
> anyone have a good flow meter to recommend?  Is there an analog type with a
> little ball that floats up and down?
>
>
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: "Sean T. Stevenson via Personal_Submersibles" <
> personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process
> Date: Sat, 06 Jan 2018 13:58:20 -0500
>
> I use dilute acetic acid to remove any existing corrosion, and then a
> non-solvent hydrocarbon-free detergent solution to clean, followed by a
> freshwater rinse, and possibly another cycle using a separate clean batch
> of detergent solution. Use dedicated brushes for each bin. A lint-free
> cloth should come back clean, and the cleaner solution and rinse water
> should both produce no fluorescence under UV (black light). Dry passively,
> or with filtered air or bottled nitrogen so as not to reintroduce any
> contaminants. Any subsequent lubrication or assembly with lubricated soft
> parts should be done with oxygen compatible lubricants (i.e. Christolube).
>
> Sean
>
> Sent from ProtonMail mobile
>
>
>
> -------- Original Message --------
> On Jan 6, 2018, 09:23, Steve McQueen via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> All, I am working on cleaning some parts/pieces for O2 service on my
> K-250. I am buying most items “pre-cleaned” such as: Tank w/Valve, First
> Stage Regulator, Thru Hull Isolation Valve, Flow Regulator.
>
>
>
> However, I will have some parts & pieces (mainly misc. adaptors and ¼ SS
> tubing) I may still need to clean.
>
> I know an “at home” process will fall short but looking to create/document
> a procedure anyway.
>
> ·        I am using ASTM G93, "Standard Practice for Cleaning Methods and
> Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched
> Environments" as the standard.
>
> ·
>
> ·        Maybe someone already has a procedure (or opinion) they want to
> share?
>
> Steve
>
>
>
> ·
>
>
>
> ·        I am using ASTM G93, "Standard Practice for Cleaning Methods and
> Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched
> Environments" as the standard.  I know an “at home” process will fall short
> but looking to create/document a procedure anyway.
>
> ·
>
>
>
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