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>There is a lot of discussions engaged about the Odyssey rebreather who is >announced as SAFE unit because using a passive addition method. Odyssey >rebreather principle is not something new, it has been using for years and I >do not believe that proportionnal purging principle which create a passive >addition is safer than other system. > >What happens if you have a failure on the purging system? > >A complete failure (zero purge=zero gas addition) is probably easily >detectable due to lack of bubbles emission, but what about a partial failure >of the purging system? Let say that instead of purging 25% of every breath >you purge only 10%, then you are in big trouble? It will generate a partial >gas addition and the risk of hypoxia or DCI (%O2 below what is planned for >deco) will be a reality. -snip- Frederic, As I understand the mechanism for the Odyssey, there are NO friction providing parts in the discharge control system. Furthermore, it is controlled by gas pressure, and in the VERY unlikely event that this did fail, the result would be less efficiency of the unit---less bottom time due to less functional volume---this would NOT effect PO2's. As I have said in another post, we are comparing the reliability of a mechanical system more like a BC (I have many thousands of dives on my old economy Seaquest Explorer BC..., zero failures), to electronics more like dive computers. Surely you will not argue that a good quality BC is far more reliable than any dive computer on the market. Dan >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > Dan Volker SOUTH FLORIDA DIVE JOURNAL "The Internet magazine for Underwater Photography and mpeg Video" http://www.florida.net/scuba/dive 407-683-3592
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