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>>I wrote: >>and maintenance! >Chris wrote: >Again I'm not convinced the costs are as high as we are led to believe. May be some confusion here. I ment that maintenance is an important aspect of safety not nessesarily cost. I don't think our operating costs are much more than open circuit. Definitely more kit to lug around ( gas supply, scrubber, test equipment etc ). >>Incidentaly Draeger quote that with the available mass flow >>orifices (which at the moment is only 50% O2) if you metabolise oxygen >>like an olympic athlete at 2.5 litres per minute then the Fo2 in the >>loop will never drop below 17%. A bummer in terms of decompression >>calcs, but then they are not suggesting that it is for that >>application.I guess it's horses for courses again This is a bit of a headache and one of the reasons why we're plumbing an O2 sensor into our loop. Currently I use my Bridge II in the 50% O2 CNS, 21% O2 deco mode which works pretty well for our breather. I wonder if this is what they had in mind! >>There is an automatic bypass valve which injects into the bag >>should you bottom the lung by either descending too rapidly or >>metabolising more oxygen via extreme workloads Note SEV = Surface Equivalent Volume. I don't understand the claim that the loop will bottom under heavy metabolic work loads. I'm guessing at the Atlantis I flow rate but if your max metabolic rate is 2.5 l/m SEV and if the flow rate is 8 l/m SEV then how can the breathing loop bottom? You're still adding 5.5 l/m SEV to the loop. I understand how this works with the LAR V or an O2 unit ( I observe this all the time with ours ). >>Not into photography - so I can't comment directly - but from my use >>they sre pretty damn silent for most of the time. When you say most of the time do you mean at depth or that only every nth exhalation vents? Here's a question. Would you regularly dive the Atlantis I solo? I do most of my open circuit dives solo, I dive our O2 fully closed breather solo, and I do most of my free diving solo. I'm not antisocial this is a result of the type of photography I do. However I would not regularly dive our semiclosed breather solo. I'm not talking about a solo dive now and then or swimming off for a minute. I mean would you dive the Atlantis I solo dive after dive? Barrie
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