1 / 14

Oxygen Tracking

Oxygen Tracking. OTR/1. Introduction. Exposure to higher ppO2 Monitor oxygen exposure Calculate for each dive Maximum levels How to track oxygen. CNS Tracking. Acute symptoms ~ CNS Quick hit Important for recreational diving Tracking CNS% CNS % Table

jeanette-leroy
Download Presentation

Oxygen Tracking

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Oxygen Tracking OTR/1

  2. Introduction • Exposure to higher ppO2 • Monitor oxygen exposure • Calculate for each dive • Maximum levels • How to track oxygen

  3. CNS Tracking • Acute symptoms ~ CNS Quick hit • Important for recreational diving • Tracking CNS% • CNS % Table • Most nitrox computers display CNS%

  4. NOAA Partial Pressure Table NOAA Partial Pressure Table (Table 2) • Maximum Exposure Times • Expressed as % (CNS%) - limit is 80%

  5. Table 2 NOAA

  6. CNS% Tracking Exposure time from NOAA Table 1 • Credit for unused time • Exposure 0.5 ppO2 or less can be ignored • Can be used for any ppO2

  7. CNS% Tracking • Add exposures for each depth and dive = Total CNS% exposure • ppO2 0.5 & above tracked • Cumulative • Recommended daily maximum = 80%

  8. CNS% Tracking Table CNS% Tracking Table (Table 3) • CNS% per minute at ppO2 • Multiply by time actually spent at depth Example: Dive for 60 min @ ppO2 1.2 Bar CNS% = 0.48 (Table 3) x 60 minutes CNS% = 28.8% (round up to 29%)

  9. Surface Interval • Each 90 minutes – CNS% reduced by 50% • Oxygen is metabolised • Full desaturation after 12 hours on air only • Example: CNS% 29% after 3 hours (180 mins) • After 90 mins 50% reduction CNS% = 14.5% • After 90 mins 50% reduction CNS% = 7% • At end of SI CNS% = 7% • Whole 90 minutes only

  10. Surface Interval • CFT always recommend 2 hour minimum SI • A maximum CNS% of 80% should not be exceeded for a single or multiple dives • Allows for complete recompression treatment

  11. Multiple Profiles • Varying profile • Separate depth stages • Calculate CNS% for each stage • Total = CNS% for dive • Dive Computer

  12. Pulmonary TrackingSlow hit • Recreational diving – rare • Expeditions/Multiple Dives • Use Oxygen Tolerance Units (OTU) • 100% oxygen at 1 Bar x 1min • Recommended limit: 850 OTUs • Calculation not required for this course • CNS% will be limiting factor

  13. Summary • Diving with high ppO2 • Monitor oxygen exposure • Calculate CNS% each dive ~ quick hit • Maximum levels • Track oxygen

  14. Questions?

More Related