User guide

Using the NiTek
NiTek Dive Computer User Manual 23
PO2 limit warning
The PO2 warning indicates that you have exceeded the 1.6
atmospheres for the gas you are breathing. When you reach 90
percent of the PO2 limit of 1.6 atmospheres, an audible alarm
sounds for three seconds and PO2 LIMIT and depth flashes for
three seconds. If you continue to descend and exceed a PO2 of
1.6 atmospheres, the audible alarm sounds again for three
seconds and the PO2 LIMIT and depth flash until you ascend to
a safer depth.
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 and depth flashing
Oxygen limit index (OLI) warning
The NiTek’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 the oxygen bar
graph flashes for three seconds. If you do not ascend to a
shallower depth, and all eight of the O2’s bars are displayed, the
alarm sounds again and oxygen bar graph flashes again. The
oxygen bar graph continues to flash until the bar graph drops to
seven bars. This warning will appear in log mode after the dive.