Oceanic OC1 - O2 Bg

82
O2BG
When operating in NORM Nitrox mode, the O2BG (Fig. 67a)
will be displayed on an Alternate screen. It represents oxygen
exposure, either oxygen accumulated during a dive or over a
period of 24 hours.
As your oxygen exposure increases, segments will add to the
O2BG, and as it decreases, they will begin to recede, indicating
that additional exposure is allowed for that dive and 24 hour
period.
The OC1 will store O2 calculations for up to 10 dives conducted
during a 24 hour period. If the limit for O2 is reached (100%
= 300 OTU), all 5 segments of the O2BG will be displayed on
the Main dive screen in place of the TLBG (Fig. 68a).
After surfacing, Plan Mode
will not be available until the
O2BG recedes into the normal
zone (4 segments).
Fig.67-NODECOALT
Fig.68-DIVEMAIN
(HighO2)
a
a
PO2
(ATA)
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
Max Duration
Single Exposure
(min) (hr)
720 12.0
570 9.5
450 7.5
360 6.0
300 5.0
240 4.0
210 3.5
180 3.0
150 2.5
120 2.0
45 .75
Max Total Duration
24 Hour Day
(min) (hr)
720 12.0
570 9.5
450 7.5
360 6.0
300 5.0
270 4.5
240 4.0
210 3.5
180 3.0
180 3.0
150 2.0
OXYGEN EXPOSURE LIMITS
(from NOAA Diving Manual)