Dive Rite Nitek Duo User's Guide download pdf (Page 35)

Using the NiTek Duo

NiTek Duo Dive Computer User Manual 31

Note: If the PO2 alarms activate at a depth of 20 feet (6 meters)

or less, you most likely have not exceeded the limiting PO2. It is

more likely that you forgot to set the FO2 percentages prior to

the dive. As a result, the computer has entered the FO2 default.

See “Understanding FO2 default” for more information.

PO2 limit warning with the PO2 limit number and “PO2”

displayed and flashing on the screen

Oxygen limit index (OLI) warning

The NiTek Duo’s oxygen limit index (OLI) reflects the

cumulative effect of your exposure to elevated partial pressures

of oxygen. The PO2 warning only accounts for the intensity of

the exposure, but the OLI accounts for both the intensity and

length.

When seven of the O2’s eight bars are displayed, the computer’s

audible alarm sounds for three seconds, and “OLI” flashes for

ten seconds. If you do not ascend to a shallower depth, and all

eight of the O2’s bars are displayed, the alarm sounds twice

again and “OLI” flashes again. “OLI” continues to flash until the

O2 bar graph drops to seven bars. This warning will appear in

log mode after the dive.

Should the OLI and PO2 warnings activate at roughly the same

time—and at relatively shallows depths, early in the dive—you

most likely have not exceeded your actual oxygen limits. What

has happened, is that you forgot to set the FO2 percentages prior

to the dive and the computer has FO2 defaulted. See

“Understanding FO2 default” for more information.

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Dive Rite Nitek Duo User's Guide Page 35