<div dir="auto">I have lots of experience working with mass-flow controllers to do precision gas dilution for sensor calibration. The brand I've always used is ALICAT. <div dir="auto"><br></div><div dir="auto">A mass flow controller is a servo controlled needle valve and flow sensor, so you can set and forget flow rates. No noisy on-off switching. I've used them for nasty things like high concentration chlorine gas for tests that lasted for weeks at a time without any issue. They also do oxygen, but like any other oxygen system you need to keep it clean. </div><div dir="auto"><br></div><div dir="auto">One thing I've always been cautioned about is to avoid using an MFC to completely stop flow, and to always put a ball valve upstream and use it to "shut down" the system. I was never told what exactly goes wrong, but I didn't want to find out with the chlorine! <br><div dir="auto"><br><br><div data-smartmail="gmail_signature" dir="auto">River J Dolfi<br><a href="mailto:Rdolfi7@gmail.com">Rdolfi7@gmail.com</a> <br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Jan 7, 2018 6:20 PM, "via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: At Home O2 Cleaning Process (Alan via Personal_Submersibles)<br>
2. Re: At Home O2 Cleaning Process<br>
(Brian Cox via Personal_Submersibles)<br>
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Message: 1<br>
Date: Mon, 8 Jan 2018 12:03:27 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process<br>
Message-ID: <<a href="mailto:634979D1-0182-4F7A-BE2E-A97CE0842B85@yahoo.com">634979D1-0182-4F7A-BE2E-<wbr>A97CE0842B85@yahoo.com</a>><br>
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Cliff,<br>
that looks good, you've got me interested in it. I am thinking it might<br>
suite me to have a paediatric click regulator as well, as if their was an electronics fault<br>
it would be easier to control the flow by just upping the click regulator output.<br>
Cheers Alan<br>
<br>
<br>
Sent from my iPad<br>
<br>
> On 8/01/2018, at 11:34 AM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
><br>
> Quite.<br>
><br>
><br>
>> On Sun, Jan 7, 2018 at 3:19 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>> Brian, Cliff,<br>
>> in my O2 system I am planning to have low pressure O2 coming through the hull with first a stop valve ( needle valve) Then a manual bypass valve ( needle valve) followed<br>
>> by a rebreather style solenoid valve & finally a click style paediatric regulator.<br>
>> So the paediatric regulator will be set just below normal consumption with an automatic<br>
>> top up from my solenoid valve based on readings from O2 sensors. The bypass valve is<br>
>> to manually bleed in O2 if the regulator & solenoid valve fail.<br>
>> Brian could get away with just the stop valve, the bypass valve & the paediatric<br>
>> regulator seeing he has a larger hull than we do. He could just manually adjust the<br>
>> regulator off O2 readings.<br>
>> Cliff, does that flow valve click on & off all the time or is it quiet in operation.<br>
>> Alan<br>
>><br>
>> Sent from my iPad<br>
>><br>
>>> On 8/01/2018, at 9:21 AM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>>><br>
>>> 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. <a href="https://www.ebay.com/itm/Porter-201-AFASVPAA-Mass-Flow-Controller-10-SLPM-760-Torr-MFC/232159305887?hash=item360dc5e09f:g:BTAAAOSwmrlUrcG1" rel="noreferrer" target="_blank">https://www.ebay.com/itm/<wbr>Porter-201-AFASVPAA-Mass-Flow-<wbr>Controller-10-SLPM-760-Torr-<wbr>MFC/232159305887?hash=<wbr>item360dc5e09f:g:<wbr>BTAAAOSwmrlUrcG1</a> 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!<br>
in the medical industry. The documentation on these meters is excellent and you can download it <a href="https://www.parker.com/literature/MFM%20&%20MFC%20(D-Conn.)%20(FM-898%20Rev.%20E).pdf" rel="noreferrer" target="_blank">https://www.parker.com/<wbr>literature/MFM%20&%20MFC%20(D-<wbr>Conn.)%20(FM-898%20Rev.%20E).<wbr>pdf</a> . 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 <a href="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-542207540" rel="noreferrer" target="_blank">https://www.amazon.com/dp/<wbr>B019YS4PSG/ref=asc_df_<wbr>B019YS4PSG5328541/?tag=hyprod-<wbr>20&creative=395033&<wbr>creativeASIN=B019YS4PSG&<wbr>linkCode=df0&hvadid=<wbr>198097951144&hvpos=1o1&hvnetw=<wbr>g&hvrand=6957636125906653374&<wbr>hvpone=&hvptwo=&hvqmt=&hvdev=<wbr>c&hvdvcmdl=&hvlocint=&<wbr>hvlocphy=9027968&hvtargid=pla-<wbr>542207540</a>!<br>
152 .<br>
>>><br>
>>> Cliff<br>
>>><br>
>>>> On Sat, Jan 6, 2018 at 1:56 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>>>> 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:<br>
>>>><br>
>>>><br>
>>>> <a href="https://www.diversalertnetwork.org/dive-store/?catno=9" rel="noreferrer" target="_blank">https://www.<wbr>diversalertnetwork.org/dive-<wbr>store/?catno=9</a><br>
>>>><br>
>>>><br>
>>>> 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?<br>
>>>><br>
>>>><br>
>>>><br>
>>>> Brian<br>
>>>><br>
>>>><br>
>>>><br>
>>>> --- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a> wrote:<br>
>>>><br>
>>>> From: "Sean T. Stevenson via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
>>>> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>> Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process<br>
>>>> Date: Sat, 06 Jan 2018 13:58:20 -0500<br>
>>>><br>
>>>> 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).<br>
>>>><br>
>>>> Sean<br>
>>>><br>
>>>> Sent from ProtonMail mobile<br>
>>>><br>
>>>><br>
>>>><br>
>>>> -------- Original Message --------<br>
>>>> On Jan 6, 2018, 09:23, Steve McQueen via Personal_Submersibles < <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>>>><br>
>>>> 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.<br>
>>>><br>
>>>><br>
>>>><br>
>>>> However, I will have some parts & pieces (mainly misc. adaptors and ? SS tubing) I may still need to clean.<br>
>>>><br>
>>>> I know an ?at home? process will fall short but looking to create/document a procedure anyway.<br>
>>>><br>
>>>> ? 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.<br>
>>>><br>
>>>> ?<br>
>>>><br>
>>>> ? Maybe someone already has a procedure (or opinion) they want to share?<br>
>>>><br>
>>>> Steve<br>
>>>><br>
>>>><br>
>>>><br>
>>>> ?<br>
>>>><br>
>>>><br>
>>>><br>
>>>> ? 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.<br>
>>>><br>
>>>> ?<br>
>>>><br>
>>>><br>
>>>><br>
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Message: 2<br>
Date: Sun, 7 Jan 2018 15:20:18 -0800<br>
From: Brian Cox via Personal_Submersibles<br>
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Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process<br>
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