29
5. Residual Nitrogen Bar Graph—A visual representation of
how much nitrogen the IQ-600 assumes your body has
absorbed. When all nine pixels appear, it means you are at
or have exceeded the No-Decompression Limit.
6. Oxygen Limit Index (OLI)—Again, this is a column of up
to eight circular pixels representing the cumulative effect
of your exposure to elevated partial pressures of
oxygen (PO
2
s). Eight pixels is roughly equivalent to having
used up 100 percent of the theoretical “CNS Clock” you
learned about during your initial Nitrox Diver training.
The number of pixels displayed will tend to increase during
dives—particularly at deeper depth. It may, however, de-
crease during shallower portions of your dive.
7. Altitude Rank—
Shows the Altitude Rank setting in effect at
the beginning of the dive.
8. Nitrox Symbol—
This appears if your IQ-600’s FO
2
has been
set to a value of from 22 to 50 percent, or if the FO
2
setting
has defaulted, following a prior Nitrox dive (see page 42 for
more information).
9. Mode Indicator—Points to the word Dive.
Should you accidentally exceed the No-Decompression Limits, the
IQ-600 can provide you with decompression stop information.
