Hi Kevin, there is no real formular out there, but you can calculate the percentage of CNS Toxicity. According to the NOAA table, you have a limit of 45 min with 1.6 bar O2. If your single exposure is 20 min, then calculate (20/45) x 100= 44.4 %. For multi- level dives: Lets assume you have 10 min with 1.6 bar O2 and 30 min with 1.4 bar O2. NOAA's limit for 1.4 bar O2 is 150 min for a single exposure. - (10min/45) x 100 = 22.2% + - (30min/150) x 100= 20 % ----------- 44.2 % total of CNS exposure for a single dive. Make sure that you also consider the 24 hour total limits. Peter -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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