User guide

Using the NiTek Plus
20 NiTek Plus Dive Computer User Manual
When this information is not available, the NiTek Plus attempts
to protect divers by basing its oxygen- and nitrogen-exposure
calculations on a “worst case” assumption. Worst case is a
mixture containing up to 79 percent nitrogen and 99 percent
oxygen. This “worst case” calculation is what is referred to as
the FO2 default setting.
Default warning indicated by Nitrox flashing
When and how FO2 default occurs
One factor in determining if and when your NiTek Plus’s FO2
setting is in default, is whether you set one or both mixes for air
or Nitrox.
• If you set either mix for air (an FO2 of 21 percent), the
computer assumes that subsequent dives will be made using
air. This means that the mix set for air remains set for air,
dive after dive, without defaulting.
• If you set either mix for anything other than air, the
computer assumes that subsequent dives will be made on
Nitrox. Thus, to protect you from accidentally diving a
Nitrox mixture that cannot accurately be monitored, the
computer’s FO2 setting defaults at midnight (it does not
default at midnight if your are under water).
Dealing with FO2 default
The best way to deal with FO2 default is to simply avoid it. The
way to avoid it is, make sure that prior to every dive you check