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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Cliff, IF you had been taking your sub I would have made the effort to come across. Q-Sub!! Batteries!! Trying to get them sorted and I am on my 3<sup>rd</sup> lot and it has not been in the water. Biggest problem is I got them too early and they have not been cycled regularly.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>2<sup>nd</sup> problem is the gearbox. I contacted Mercruiser agent and asked which direction did the driveshaft have to go before I made the gearboxes. He told me I could run it either way. I belaboured the point to make sure as I said I could do a gearbox to go either way. Trouble is I did not get it in writing. Now after testing and pulling the top off I found I have to redesign and remake two gearboxes to give same direction in as out. That really taught me a lesson as well as making me angry as hell. Also had a Kelly BLDC motor controller fall over and trying to get it fixed. A few minor issues with wiring and controls which I expected. I have done some nice LED lights 150 watt which are 2<sup>nd</sup> generation but are good to go. They get a bit hot in air after 15 minutes but all good in water. Had some problems with the engines as I had taken a feed off the crank sensor. Took that off and they ran sweetly. Hydraulics needed pump changing out for a smaller one. Again supplier fault. Getting there but as you say, complexity = extended time. All-a-same-engineering, Boss!!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Kind regards, Hugh </span><span lang=EN-NZ style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Cliff Redus via Personal_Submersibles<br><b>Sent:</b> Monday, 21 July 2014 1:45 a.m.<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re: [PSUBS-MAILIST] O2 regulator<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Good point about the ABS increasing the CO2 limit for scrubber change out and emergency lift support situations. I still prefer to have higher resolution of the measurement for normal operating conditions so I will stick wit my 1% sensor. If you install a 5% sensor and find out you are not happy after using it awhile, the nice part about using a PLC is it is easy to change a few rungs of ladder logic and install a different sensor. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Sounds like you are having second thoughts on casting an aluminum hull. If you went with ABS rule, you would end up having to do a lot of imperial testing of the hull meet their classing rules. Thy like and understand steel weldments!<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>When I last saw the Q-Sub which was several years ago, it had its exostructure off. There a lot of systems on the boat. Added systems means added complexity which means a longer time to sort eve thing out. But "I agree, when she finally gets commissioned, she will be awesome!<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Cliff<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><div><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br><b>Sent:</b> Saturday, July 19, 2014 10:59 PM<br><b>Subject:</b> Re: [PSUBS-MAILIST] O2 regulator</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div id=yiv0963927174><div><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Hi Cliff,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>The graphs on your plc sound a great idea. Good way to monitor things.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>With G.L. the accuracy you get on the 0-50,000ppm (5%) unit is fine.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>They require an accuracy of + or - 0.001 bar CO2 partial pressure. That is 1000ppm.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> ABS does say 0.5% by volume limit, but it lets you go up to 1% during a scrubber change over,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>& 1.5% for emergency life support situations.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>I like the 0-50,000 unit for peace of mind, in case you did get in an emergency situation & the CO2<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>level went beyond 10,000ppm. On the <span class=yiv0963927174>pdf</span> for the higher range units it says that the minimum operating<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>pressure is .950 - 40 bar. So I guess you would need to monitor the cabin pressure with alarms to ensure you didn't<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>go below the minimum it functioned at. I couldn't see any pressure operating range specified with your unit.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> I'm not sure where I'm at with the <span class=yiv0963927174>aluminum</span> pressure hull idea. <span class=yiv0963927174>Gas</span> bubbles formed in the casting process<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>are hard to control. G.L. doesn't like <span class=yiv0963927174>aluminum</span> as a pressure vessel, & it's more subject to galvanic corrosion than<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>steel. Also if I wanted it hard anodized I would have to do it outside N.Z. as there are no tanks big enough here.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>There are ASME rules for cast <span class=yiv0963927174>aluminum</span> pressure vessels, but I haven't got hold of them yet. (anyone own them??)<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Phil made one of his Newt suits out of cast <span class=yiv0963927174>aluminum</span>; so hopefully I can pick his brains on this in August.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> Don't you love the flight down here. Hope you sleep well on planes. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> I caught up with Hugh last week & some of the exostructure was off his Q-sub. When you see it like that you can<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>appreciate the enormous amount of engineering work gone in to it. I think Hugh is well & truly over it with all the problems<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>but it's going to be awesome when he get's it diving.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Have a good trip to OZ.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Alan<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div id=yiv0963927174yqt56381><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br><b>Sent:</b> Sunday, July 20, 2014 8:57 AM<br><b>Subject:</b> Re: [PSUBS-MAILIST] O2 regulator</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div id=yiv0963927174><div><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Alan<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>From a Navy document on CO2 they describe the physiological impact of CO2 in the atmosphere:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>2-3% Shortness of breath deep breathing<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>5% Breathing becomes heavy, sweating, pulse quickens<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>7.5% Headaches, dizziness, restlessness, breathlessness, increased heart rate and blood pressure, visual distortion<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>10% Impaired hearing, nausea, vomiting, loss of consciousness<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>30% Coma, convulsions, death<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>A 0-30,000 ppm (3%) or 0-50,000 (5%) sensor is fine but you loss accuracy when the span increases. These meters are typically +/- 0.5% accuracy based on the span of the meter. For a 30,000 ppm meter, this gives +/- 150 ppm. For a 10,000 ppm span, the same 0.5% accuracy meter gives you a +/- 50 ppm accuracy, or three time the resolution of the measurement. Another reason I like the 10,000 span is for my boat I am trying to stay within the 0-5000 ppm level set by ABS. Normally this sensor is reading 1000-2000 ppm. The only time is will run higher is when the CO2 absorbent become saturated and is no longer pulling CO2 out of air. So if has been 8 plus hours on one scrubber, I start to get a color change of the absorbent and I see the CO2 ppm level start to continually increase, I know it is time to change the absorbent. My PLC touch screen has a plotting feature so I have a screen that shows the CO2 and O2 levels plotted over time. It is pretty easy to see with the absorbent become saturated.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>So the short answer is I like the better accuracy I get over the range I would expect to see.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>I am sorry to miss the convention as well. I was looking forward to hearing about the progress you have made on your new one atmosphere boat. Are you still planning on casting the pressure hull?<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>Next week I will be in your part of the world Australia; not home but close. No plans to hit New Zealand on this trip. Though I would like to see how Hugh Fulton is coming along on his QBoat<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>Cliff<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div id=yiv0963927174yqt86791><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br><b>Sent:</b> Saturday, July 19, 2014 3:01 PM<br><b>Subject:</b> Re: [PSUBS-MAILIST] O2 regulator</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div id=yiv0963927174><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>That's a great link Cliff, have bookmarked it.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>I am wanting something to link to a plc & they have some treat options.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>How come you didn't buy a unit with a wider range?<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Phil's life support paper is saying we can take 3% for 1 hour, but the<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>range on the one you bought is 0 to 1%.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Sorry you aren't making it to Bellingham. It was a real treat seeing the R 300<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>in Florida.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Alan<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br><br>Sent from my iPad<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div id=yiv0963927174yqt15142><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br>On 19/07/2014, at 12:25 pm, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>I use a K-30, part number SE-0018 , 0-10,000 ppm (0-1%) CO2 sensor from a company CO2 meters inc. The cost is $85 and it sends a 0-5 VDC output sensor.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><a href="http://www.co2meter.com/collections/co2-sensors/products/k-30-co2-sensor-module" target="_blank">http://www.co2meter.com/collections/co2-sensors/products/k-30-co2-sensor-module</a><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'> Has worked flawlessly.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Cliff<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br><br><br><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br>Cliff Redus<br>Redus Engineering<br>USA mobile: 830-931-1280<br><a href="mailto:cliffordredus@sbcglobal.com" target="_blank">cliffordredus@sbcglobal.com</a> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><div><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Pete Niedermayr via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> <br><b>Sent:</b> Friday, July 18, 2014 7:05 PM<br><b>Subject:</b> Re: [PSUBS-MAILIST] O2 regulator</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br><br>Cliff, What are you using for a CO2 sensor?<br><br>Thanks Pete<br><br>--------------------------------------------<br>On Thu, 7/17/14, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br><br>Subject: Re: [PSUBS-MAILIST] O2 regulator<br>To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Date: Thursday, July 17, 2014, 8:30 AM<br><br>Hank<br>On the R300, I have life support<br>module I call the AMOC system (Air monitoring and Oxygen<br>Control). Connected to the box is a 1/4" SS tubing<br>with Swagelok fittings connected to a O2 supply from an<br>external 2200 psig O2 bottle. I fill this with welding O2<br>with a whip. In the AMOC module is a medical pressure<br>reducing regulator (Hudson model 2000). This regulator <br>reduces the pressure to around 5 psig. The pressure<br>downstream of the regulator is adjustable with a maximum<br>rate of 15 SLPM. The porting on this regulator is two<br>1/4" NPT HP ports and one LP port. Downstream of<br>this regulator, I have installed an O2 thermal mass meter/<br>controller from Porter. <br> The model number is 201-FSVP. This controller can be set<br>from 0-10 SLPM via an 0-5V analog input signal. Max<br>pressure on the O2 controller is 25 psig. This O2<br>controller also sends out at 0-5V analog output signal of<br>the O2 SLPM flow rate.<br>Both these items were purchased on<br>Ebay at a fraction of list. I have been very happy<br>with the performance of these units. By measuring the O2<br>and CO2 percentages in the cabin, I have a PLC that opens<br>and closes this controller to keep the cabin O2 % between<br>19-22%. ABS regulations requires that the O2 be held with<br>in 18-24%. The advantage of this system is that it<br>automatically accounts for different metabolic consumptions<br>rates for O2. In the AMOC unit, I have a Swagelok needle<br>valve in a bypass around this controller so that if both<br>main and back up power are lost, the pilot can manually<br>adjust the O2 rate<br> into the boat.<br>The<br>second part to controlling the atmosphere in the cabin is<br>scrubbing the CO2. I initially used a axial flow filter<br>with SodaSorb HP. I found that the axial flow filter did<br>not work very well with CO2 in the cabin ranging from 0-7000<br>ppm. Part of the problem was the axial filter arrangement<br>and part of the problem was the blower was not strong<br>enough. At the 2012 PSUB convention in Vancouver, Alec<br>Symth brought the scrubber he was using on Snoopy as a<br>show and tell. His scrubber is an OTS radial filter that<br>is used to clean air. In 2013, I switch to this type of<br>scrubber/filer again with SodaSorb HB and the scrubber has<br>worked much better. It consistently keeps the CO2 level<br>below 2000 ppm with most of the time it being 1000-1500<br>ppm. ABS rules require that you keep O2 concentration<br>below 5000 ppm. Part of the reason that is works better<br> is the radial design which minimizes the pressure drop<br>through the Sodasorb and part is that I have switched to a<br>stronger blower.<br>Long<br>answer to short question.<br><br>Cliff<br><br><br><br> <br><br> On Thursday, July 17, 2014 9:27 AM,<br>hank pronk via Personal_Submersibles<br><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br> <br><br> Hi All,I need to find a pediatric<br>flow meter and regulator for Gamma. Or is there something<br>better?Hank<br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br> <br> <br>-----Inline Attachment Follows-----<o:p></o:p></span></p><div id=yiv0963927174yqtfd24320><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" 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