Seemann XP5, Owner'S Manual, Page: 94 / 108

94
OXYGEN EXPOSURE LIMITS
Predicted exposure limits and oxygen calculations of the XP
5 are based on maximum exposure durations published by
the National Oceanic and Atmospheric Administration in the
October 1991 NOAA Diving Manual (Fig. 98).
Both central nervous system (CNS) oxygen toxicity and
pulmonary oxygen toxicity were taken into consideration
when the limits were published by NOAA.Although CNS
oxygen toxicity is considered the primary constraint for
higher levels of PO2, there are circumstances in which pul-
monary oxygen toxicity can limit exposures.
CNS oxygen toxicity is not considered likely at PO2 levels
below 1.30 ATA. It is however related to the diver's work
level. Performing strenuous tasks could cause the
symptoms of oxygen poisoning to occur at PO2 levels
lower than they normally would appear during casual
recreational diving.
WARNING: The nitrox features of the XP 5 are
intended for use only by recreational divers
trained for nitrox diving by an instructor
certified by a recognized training agency to
teach diving with nitrox.
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 24hr
(Min)
720
570
450
360
300
270
240
210
180
180
150
Fig. 98 - Oxygen Exposure Limits