Which table?do it easy:Regarding CNS vs pulmonary toxicity, I was under the impression that the oxygen exposure tables are for pulmonary toxicity, and that the way to avoid CNS toxicity is to not dive past the "limits". Does anyone have any concrete evidence about this?
The "CNS Clock" table is designed to avoid a CNS hit.
The "Repex" table for tolerable exposures is designed to prevent pulmonary toxicity problems.
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There's an awful lot we don't understand about oxygen toxicity; if you dig around you'll find that there are divers violating just about every rule we have, routinely and successfully - but in very specific controlled ways.
For recreational Nitrox diving, the recommended limiting PO2 is 1.4 ATA; the maximum limiting PO2 is 1.6. Divers should plan the diving day to not exceed 80-90% of the CNS clock, and allow an hour between any two Nitrox dives.
Don't push it.
Rick