IANTD OTU/CNS Table

Oxygen exposure tracking is important in technical and rebreather diving. Use these tables to determine the Percent CNS O2 clock or Oxygen Toxicity Units (OTU) for any time exposure to PO2's from 0.60 ATA to 1.60 ATA in 0.05 ATA increments. Use the surface interval credit table to determine residual % CNS for surface intervals of :30, :60, :90, and 2 to 6 hours. Also included is a table to determine PO2's at depths of 10 fsw (3 msw) to 220 fsw (67 msw) in 10 fsw (3 msw) increments for Air, Nitrox and Oxygen.