[PSUBS-MAILIST] flow meters

Tue Mar 13 19:57:14 EDT 2018

Brian,
I can't see what it's maximum inlet pressure is, but on another site it is
saying they are calibrated for an inlet pressure of 50psi. So would need
a regulator set to output 50psi & be rated for the inlet pressure you want.
I think those paediatric regulators have a 50psi output pressure so it 
should work putting it in line with your flow meter but it is a bit of a strange
set up. I would have just gone with a normal regulator. See if you can
find out more info on your flow regulator model.
If you have a needle valve before your regulators to bypass them you can 
just turn that on & off if all else failed.
Alan

Sent from my iPad

> On 14/03/2018, at 11:43 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,    
>              My plan was to go from my med regulator to my flow meter, My flow meter ( recommended from Cliff)  has a range between 0 and 5 lpm.  But I'm not really sure what the supply pressure for my flow meter is suppose to be.  My O2 bottle is still sitting down at the dive shop , so as soon as I get it I'm going to test things out.
>  
> Brian
>  
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] flow meters
> Date: Wed, 14 Mar 2018 11:24:00 +1300
> 
> Brian, Rick,
> GL is saying O2 consumption is 15 l/h resting, 40 l/h working & 26 l/h average.
> (.43 litres per minute. ) Even my paediatric click regulator isn't fine enough by the
> look of it, it does 1/4 of a litre, (.25) then the next step is 1/2 (.5) 
>  You have got me rethinking this Rick. I might go with a flow meter so I can
> finely adjust it & stop a potentially noisy O2 add system turning on & off
> frequently.
> Brian your 0-8 litre regulator seems to have the same increments in the low
> range as my 0-4 litre regulator so you aren't loosing anything with it.
> Alan
> 
> Sent from my iPad
> 
> On 14/03/2018, at 10:07 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> My medical O2 regulator goes from 0 to 8 lpm  ,  My scuba shop finally got my bottle filled !  They had lost a transitional fitting needed to fill the bottle so I've been waiting for about two weeks now.  It's a good thing they got the part because there is literally no other place around who will fill it !    Don't ask me how or why they are so easy about filling the O2 but I checked every other dive shop within 100 miles and nobody would do it.  Believe me I'm not asking any questions, just thanking them for my fill  ;-) 
>  
> Brian
>  
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] flow meters
> Date: Tue, 13 Mar 2018 10:39:44 -1000
> 
> Alan,
> 
> So you have the second one you listed so you are bringing the HP 02 right up to that?
> 
> Rick
> 
> 
> 
> On Tue, Mar 13, 2018 at 10:08 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> Rick,
> just looked at my 0-4 LPM paedeatric click style oxygen meter & it says 
> "maximum pressure not to exceed 2600 psi."
> Alan
> 
> Sent from my iPad
> 
> On 14/03/2018, at 8:13 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Rick,
> as you say "above ambient" so at 350' depth you will have 130psi
> coming out of the regulator plus another 175psi for the ambient depth.
> EMT have this...https://www.emtmedicalco.com/GENTEC-OXYGEN-FLOWMETER-WITH-REGULATOR-0-15-LPM-CGA-870-OR-540-191M.htm
> I bought a pressure regulator for inside the hull to deal with that,
> however the click style paediatric regulators they have take a high inlet pressure
> although I can't see any literature on this at EMT.....
> https://www.emtmedicalco.com/PEDIATRIC-REGULATORS-0-4-LPM-CGA-870-8704.htm
> Alan
> 
> 
> Sent from my iPad
> 
> On 14/03/2018, at 6:53 AM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Was looking into buying an 02 flow meter yesterday online and was told that the incoming pressure to the meter had a max incoming working pressure of 50 psi. My bottles will be on the outside and I have two 02 cleaned first stage regulators that will take them from HP to LP then into the sub.
>  I guess the average LP setting is  around 150 psi + -above ambient? so I should be able to have a dive shop re set them down to 50 psi? What have others done that have the same scenario and wonder if there are flow meters that can take the 150 psi in?
> 
> Rick
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