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Well, for what is worth, I had a practical experience with this I think is worth sharing. I have more than a year of practical experience mixing EAN32 and EAN36 using the partial pressures method. Those mixtures produce the expected reading when analyzed right after the mix process. I recently joined an expedition to a deep wreck diving in Fernando de Noronha, Brazil, where I was responsible for planning the deco schedules and mixing the deco mistures. Our plan called for EAN80 deco mixes and this was the first time I was mixing those high O2 percentages (I normally used pure O2). Due to the tide, our dives started around 11:00 AM, so we ran all the tables the previous night and next morning we went to the Port to mix the EAN80 and get the boat (the filling station is near the port, far from the dive shop). We mixed several EAN80 bottles and I almost aborted the first day of diving, because when we started analyzing the mixes, we got all bottles reading anything between 50% and 70% of O2. Of course we didn't have the tables for those deco mixes. After a long (30-45 min) and heated discussion with the rest of the team (they wanted to dive anyway, on air), we decided to reanalyze the bottles and sure enough all bottles read 80% O2 ... I hope this helps. --- Mauricio Henriques Network Consultant Phone: +[55](21)297-1122 x.4715 Digital Equipment Co. FAX: +[55](21)220-3324 Brazil PDIC Instructor Trainer #5262 TDI Instructor #303 mauricio@va*.en*.de*.co* ---
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