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A combination of theories as to what is safe in gas switching in a full face mask is what I persoanlly use and feel works perfectly. While it is true that you do not want to accidently mix gasses while breathing, in our gas switching block, we incorporate 4 valves as inlets and one as an outlet to your full face mask. the top 2 valves are for bottom and/or deep mixes, and are connected all the time. The bottom 2 valves are for additional mixes, EAN, or O2, and they incorporate quick connects, which we leave disconnected when not in use. A switch to a High PO2 gas requires you to actively think about what you are doing. In most cases, our doubles also incorporate the standard isolation manifold too, so there would be no switching of gasses on the top 2 knobs, only control in case of a free flow or malfunction. We also carry the spare mask and we have 2 of our own octos as backup for us and others. Using this system I have comfortably breathed on slowly malfunctioning first stages, and controlled a full face mask 2nd stage freeflow so that it did not use all my air and REQUIRE a bailout to a standard mask. In the past we had run the systems as independent doubles, and it used Mix on one side and Air on the other as an ascent/descent gas. Let me know if you are interested in any more particulars. Tim Olson Deepdive@sa*.cv*.or* On Wed, 1 May 1996, Reg Creighton wrote: > We have machined a fitting that goes in between your hose and a high > pressure gas quick connect. The reason being, I have not see a fool poof > manifold where there is no way you can not mix gas by accident. > > The quick connectors allow you to switch gases FASTER than regulator > switches and there is no way you can switch to the wrong gas unless you do > it on purpose, just like a standard regulator switch. > > We have tested it to 300 FSW on Trimix with no problems. > > The diver also carries a backup mask and a standard 2nd stage that has a > quick connect so if there is a complete failure of the full face you can > just switch back to standard scuba. > > Reg Creighton > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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