<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Rick,</div><div id="AppleMailSignature">just to make it more complicated; you need to monitor the contents of</div><div id="AppleMailSignature">your O2 tank, so this may mean bringing the high pressure on to a through</div><div id="AppleMailSignature">hull to read on an internal gauge. In which case you may as well have a</div><div id="AppleMailSignature">regulator off this to your flow meter. Whether you do this off the high pressure</div><div id="AppleMailSignature">port of your first stage or not I am not sure. You would have enough flow from</div><div id="AppleMailSignature">it for your life support system. It may pay to ask how all the Psubbers</div><div id="AppleMailSignature">are doing it & debate the pros & cons.</div><div id="AppleMailSignature">I have had some electronic pressure gauges built with a male fitting compatible</div><div id="AppleMailSignature">with a first stage high pressure port, & are pressure proofing them. So</div><div id="AppleMailSignature">will only have wires not hp on to the sub.</div><div id="AppleMailSignature">Cheers Alan<br><br>Sent from my iPad</div><div><br>On 14/03/2018, at 10:27 AM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Rick,</div><div id="AppleMailSignature">I bought it when I was first going to build a 1atm but didn't install</div><div id="AppleMailSignature">it as I built an ambient first.</div><div id="AppleMailSignature"> I would guess that half the Psubbers have a similar click style regulator</div><div id="AppleMailSignature">& half use a flow meter. I am going with a variation on the "belows add"</div><div id="AppleMailSignature">system where the flow is set below your minimum requirement ( so as to never</div><div id="AppleMailSignature">be able to over-pressurise) & the balance of O2 is added by a bellows or</div><div id="AppleMailSignature">electronically off O2 or pressure readings.</div><div id="AppleMailSignature">I am pretty sure on the Triton 3000 the pilot was just manually adjusting the flow</div><div id="AppleMailSignature">meter off O2 readings like they did in the old days. If you are adjusting manually</div><div id="AppleMailSignature">then the flow meter would be better because the click style regulator "clicks"</div><div id="AppleMailSignature">around to varying range increments whereas you could get a finer adjustment</div><div id="AppleMailSignature">with the flow meter.</div><div id="AppleMailSignature">Mine is a CGA fitting brass sleeved 50psi O2 regulator, 0-4 LPM. Model AREG5404</div><div id="AppleMailSignature">with input pressure max of 2600 psi. And yes I am running it off an O2 cleaned first stage regulator to keep high pressure O2 away from the hull & the various</div><div id="AppleMailSignature">hardware down line from the regulator. </div><div id="AppleMailSignature">You can adjust the pressure above ambient out of some first stage regulators</div><div id="AppleMailSignature">by replacing the spring. I tried a system of air compensation that Karl Stanley</div><div id="AppleMailSignature">uses; he just takes the spring out of a first stage regulator & that gives him</div><div id="AppleMailSignature">ambient pressure.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"> <br><br>Sent from my iPad</div><div><br>On 14/03/2018, at 8:49 AM, Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Hi Alan,<div><br></div><div>I thought about the fact that the pressure to the inside of the sub would be increasing with depth after I sent the post. Are you also breaking down the HP to LP at the bottle outside the sub? Did you buy the regulator/flow meter you showed me? </div><div><br></div><div>Rick</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 13, 2018 at 9:13 AM, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Rick,</div><div>as you say "above ambient" so at 350' depth you will have 130psi</div><div>coming out of the regulator plus another 175psi for the ambient depth.</div><div>EMT have this...<a href="https://www.emtmedicalco.com/GENTEC-OXYGEN-FLOWMETER-WITH-REGULATOR-0-15-LPM-CGA-870-OR-540-191M.htm" target="_blank">https://www.<wbr>emtmedicalco.com/GENTEC-<wbr>OXYGEN-FLOWMETER-WITH-<wbr>REGULATOR-0-15-LPM-CGA-870-OR-<wbr>540-191M.htm</a></div><div>I bought a pressure regulator for inside the hull to deal with that,</div><div>however the click style paediatric regulators they have take a high inlet pressure</div><div>although I can't see any literature on this at EMT.....</div><div><a href="https://www.emtmedicalco.com/PEDIATRIC-REGULATORS-0-4-LPM-CGA-870-8704.htm" target="_blank">https://www.emtmedicalco.com/<wbr>PEDIATRIC-REGULATORS-0-4-LPM-<wbr>CGA-870-8704.htm</a></div><div>Alan</div><div><br></div><div><br><div>Sent from my iPad</div></div><div><div class="h5"><div><br>On 14/03/2018, at 6:53 AM, Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">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.<div> 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?<div><br></div><div>Rick</div></div></div>
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