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Dive Rite O2ptima Owner's Manual Page 39

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2
O ptima FX Owner’s Manual
Ch. 5 Pg. 3
Copyright, Dive Rite All Rights Reserved January 2009
Lets examine a dive for 20 minutes at 100fsw and 30 minutes at 60fsw using a setpoint of
1.3ata.
(20 minutes + 30 minutes) X 100 / 180 minutes = % CNS
50 minutes X 0.56 % / minute = 28% CNS
Residual Oxygen Toxicity (CNS%)
While on the surface, your Percentage of Oxygen Toxicity is reduced in a similar fashion to the
way Nitrogen out-gases from the body. Essentially after 90 minutes the Oxygen loading is
reduced by half and again by another half after the next 90 minutes. This is the definition of a
half-time.
Residual % Toxicity = Starting % Toxicity X (.5)
surface interval / 90
The above formula is implemented in the chart below, simple look up the starting %CNS and
find the appropriate surface interval (for added conservatism use the closest SHORTER
interval if exact interval is not on the chart ) to determine the divers residual %CNS.
Residual CNS%
%CNS / SI 60
min
90
min
120
min
150
min
180
min
210
min
240
min
270
min
300
min
330
min
360
min
100 63.0 50.0 39.7 31.5 25.0 19.8 15.7 12.5 9.9 7.9 6.3
95 59.8 47.5 37.7 29.9 23.8 18.9 15.0 11.9 9.4 7.5 5.9
90 56.7 45.0 35.7 28.3 22.5 17.9 14.2 11.3 8.9 7.1 5.6
85 53.5 42.5 33.7 26.8 21.3 16.9 13.4 10.6 8.4 6.7 5.3
80 50.4 40.0 31.7 25.2 20.0 15.9 12.6 10.0 7.9 6.3 5.0
75 47 .2 37.5 29.8 2 3.6 18.8 1 4.9 11.8 9.4 7.4 5 .9 4.7
70 44 .1 35 .0 27 .8 22 .0 17 .5 13 .9 11.0 8.8 6.9 5 .5 4 .4
65 40.9 3 2.5 25.8 2 0.5 16.3 12.9 10.2 8.1 6.4 5 .1 4.1
60 37.8 30.0 23.8 18.9 15.0 11.9 9.4 7.5 6.0 4.7 3.8
55 34.6 27.5 21.8 17.3 13.8 10.9 8.7 6.9 5.5 4.3 3.4
50 31.5 25.0 19.8 15.7 12.5 9.9 7.9 6.3 5.0 3.9 3.1
45 28.3 22.5 17.9 14.2 11.3 8.9 7.1 5.6 4.5 3.5 2.8
40 25.2 20.0 15.9 12.6 10.0 7.9 6.3 5.0 4.0 3.1 2.5
35 22.0 17.5 13.9 11.0 8.8 6.9 5.5 4.4 3.5 2.8 2.2
30 18.9 15.0 11.9 9.4 7.5 6.0 4.7 3.8 3.0 2.4 1.9
25 15.7 12.5 9.9 7.9 6.3 5.0 3.9 3.1 2.5 2.0 1.6
20 12.6 10.0 7.9 6.3 5.0 4.0 3.1 2.5 2.0 1.6 1.3
15 9.4 7.5 6.0 4.7 3.8 3.0 2.4 1.9 1.5 1.2 0.9
10 6.3 5.0 4.0 3.1 2.5 2.0 1.6 1.3 1.0 0.8 0.6
5 3.1 2.5 2.0 1.6 1.3 1.0 0.8 0.6 0.5 0.4 0.3
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