Jeff Hester
Registered
I'm trying to wrap my head around the CNS value that is being measure on my Shearwater Petrel 2. I'm on a rEvo rebreather, we did a dive at 1.3 ppO2 for 150 minutes, roughly 3 hours on the surface, then a 60 minute dive at 1.3 ppO2. After dive 1, the CNS value was 72, after dive 2, it was right around 60. If I look at the NOAA tables that I thought the algorithm was based on, 210 minutes is the max for a 24 hour period at 1.3 ppO2, and I know most say go to 80% of that for a safety factor. I've also seen the CNS value over 100 before so my original assumption was that it's not a percentage, but now that I type this out, would it just be saying that I was over 100% of my CNS allotment? And then in the case of the 2 dive day at 1.3, does the clock not take into account the 24 hour period column on the NOAA table? Thanks for any help with clarification!