Owner's Manual

UP BUTTON
TOGGLES
BETWEEN PO
2
,
OLF%, DIVE TIME
AND WATER
TEMPERATURE.
6.2.2. Oxygen limit fraction (OLF%)
If set to the MIXED or CCR mode, in addition to tracking the diver's exposure to inert
gas, the instrument tracks the exposure to oxygen. These calculations are treated as
entirely separate functions.
The dive computer calculates separately for Central Nervous System oxygen toxicity
(CNS) and Pulmonary Oxygen toxicity, the latter measured by the addition of Oxygen
Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure
for each is expressed as 100%.
The Oxygen Limit Fraction (OLF%) displays only the value of the higher of the two
calculations. The oxygen toxicity calculations are based on the factors listed in Sec-
tion 10.3. Oxygen exposure.
6.2.3. Gas change and multiple breathing gas mixes in MIXED mode
The Suunto DX allows gas changes to enabled gas mixes during the dive. When the
maximum operating depth allows for a gas change, the dive computer prompts you
to change the gas. When PO
2
permits better decompression gas to be used, the dive
computer prompts it automatically if it is set as primary. Gas changes are made by
following the procedure below:
92