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Forwarded private response: -------------------------- Dear tj: Feel free to post this on the techdiver list. My company, Underwater Applications Corp, contracted Hamilton Research to develop the oxygen loading algorithm for my customer, Seiko-Epson Corp, for use in the Dive Rite Bridge computer. I co-authored the paper with Bill Hamilton that was presented at the UHMS workshop in Halifax that same year (I think 1992). The 90 minute half time that you mention in your post was developed by Hamilton and I to use in this algorithm. The method allows for full recovery in 9 hours as long as the CNS clock was not exceeded. If the CNS clock is exceeded, then after 9 hours the computed value for the CNS clock (what we call "oxygen limit index") may be a number of interest (something more than 1% or so). The method provides conservative coverage for both CNS and pulmonary toxicity for all dives other than something like saturation or repetitive saturation. Your dive computer probably requires that the dive computer either be stable at the surface for 24 hours or maybe until the dive computer is totally clear, in order to reset the CNS O2 clock. They may have wrote the code this way to stay in keeping with the more widely known NOAA and Navy publications, or because they were unaware of the Bohrer-Hamilton paper presented at UHMS, or because their model was developed before the publication of this paper. This probably doesn't help you much, but I thought you might find it interesting. Sincerely, C. Randy Bohrer, President Underwater Applications Corp 15 Brewster Rd Framingham, MA 01702 tel: 508-628-9520 fax: 508-820-3337 http://www.geocities.com/~uwapplications -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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