Extrait :

The facility of a CCR to maintain a set point makes forward prediction of decompression incorrect. The computer will not forward predict the greatly increased O2 fraction in shallow water i.e. in ascent phase. The Air X O2 takes the highest O2% gained at the beginning of the dive and logs the information for comparison. This information is required to compare to actual inspired O2% and calculate both the CNS clock and Nitrogen diffusion rate based on the oxygen consumption.

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