75
ReACT Pro
NITROX DIVING
Both central nervous system (CNS) oxygen toxicity and pulmonary oxygen toxicity were taken
into consideration when the Maximum Durations (Fig. 79) for a Single Exposure and for Any 24
Hour Day were published by in the October 1991 NOAA Diving Manual. Although CNS oxygen
toxicity is considered the primary constraint for higher levels of partial pressure of oxygen (PO2),
there are circumstances in which pulmonary oxygen toxicity can limit exposures.
CNS oxygen toxicity is not considered likely at PO2 levels below 1.30 ATA. It is, however, re-
lated to diver's work level. Performing strenuous tasks could cause the symptoms of O2 poi-
soning at PO2 levels lower than they normally would appear during casual diving.
WARNING: In the event that you exceed the maximum limit of per dive
allowable O2, it is recommended that you allow at least 2 hours at a
normoxic PO2 before diving again. If you have reached the Maximum Total
24 hour Day Limits, you must spend at least 12 hours at a normoxic PO2
before diving again (you should allow a surface interval of at least 24 hours
before reentering the water).
WARNING: Diving with Nitrox mixtures requires special knowledge of the
variations imposed upon divers, their activities, and their equipment by the
increased percentage of O2. Genesis Scuba recommends completion of a
specialized Nitrox training course by a recognized training agency prior to
diving with any Nitrox mixtures.
Fig. 79 - NOAA O2 Limits
Maximum
Exposure Time
PO2
(ATA)
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
Per Dive
(Min)
720
570
450
360
300
240
210
180
150
120
45
Per 24 hr
(Min)
720
570
450
360
300
270
240
210
180
180
150
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