82
®
OXYGEN EXPOSURE LIMITS
Predicted exposure limits and oxygen calculations of the Pro Plus are based on
maximum exposure durations (Fig. 82) published by the National Oceanic and
Atmospheric Administration in the October 1991 NOAA Diving Manual.
MULTIPLE TISSUE TRACKING
The Pro Plus tracks twelve tissue compartments with halftimes ranging from
5 to 480 minutes. The Tissue Loading Bar Graph always displays the control-
ling compartment that is the only one important at that time. Think of the
Tissue Loading Bar Graph as twelve separate transparent displays laid on top
of one another (Fig. 83). The tissue compartment that has filled up fastest is
the only one the viewer can see from the top.
At any particular point, one tissue compartment may be absorbing nitrogen,
while another that was previously higher may be off-gassing. Figure 84 illus-
trates the point at which one compartment “hands over” control to another
compartment at a different depth. This feature of the Decompression Model is
the basis of multilevel diving, one of the most important contributions the Pro
Plus offers you.
Fig. 82 - Oxygen
Exposure 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 24hr
(Min.)
720
570
450
360
300
270
240
210
180
180
150
