39
PUCK DIVE COMPUTER
ENGLISH
Press the button to display the NO FLY time and
the SURF TIME.
Press the button to move to the ESC position.
Press and hold the button to exit this menu and
return to the main menu.
DIVE - EAN
Due to the lower percentage of nitrogen in the
breathing mix, oxygen-rich mixtures make it
possible to extend the no-decompression limits,
as compared to the same dive with air.
However, the higher oxygen content in the mix
exposes the diver to oxygen toxicity hazards
which are not generally encountered in
recreational dives with compressed air.
In EAN mode, PUCK computes oxygen toxicity
on the basis of the dive time, the depth and the
oxygen percentage setting, providing indications
that enable the diver to remain within the safe
limits for oxygen exposure.
To dive with an EAN mix, you must select the EAN
mode in the Set Mode menu.
PUCK handles EAN dives in a similar manner to
compressed air dives. That means that you will
have the same functions and procedures for
selecting the Dive mode. The only differences
in managing the two types of dives lie in setting
the general parameters for EAN dives and in the
display of these parameters in addition to the
normal air dive parameters (discussed in the
preceding section).
This section will examine the general parameters
that are specific to EAN dives monitored by PUCK
and the differences in how the data are displayed.
WARNING
It is essential to correctly set the oxygen
percentage in the mix to ensure correct
readouts of:
• No decompression time remaining
• Decompression stop times
• Alarm on exceeding the maximum
permitted PPO
2
WARNING
Before the dive, make sure you have
correctly set up all the EAN dive parameters:
percentage of oxygen in the mix and limit
for the partial pressure of oxygen, which
together determine the maximum depth of
the dive.
WARNING
The use of oxygen rich mixes exposes the
diver to different hazards from those
associated with compressed air. The
diver should be aware of these risks and
understand how to avoid them.
WARNING
PUCK should only be used for diving with
oxygen rich mixes (EAN) by divers who
have the necessary certification. Lack of
appropriate diver training may result in
possibly serious injury.
WARNING
The user is advised to carefully read the
section on compressed air diving before
reading the section on EAN dives.
CHECKING THE GENERAL DIVE
PARAMETERS
OXYGEN PARTIAL PRESSURE
When the diver reaches a depth at which the
PPO
2
exceeds the maximum limit entered in the
corresponding parameter, (from 1.2 to 1.6 ATM),
Puck triggers an alarm condition signaled by:
• blinking depth indication
• audible alarm
The alarm continues until the diver ascends
enough to bring the PPO
2
back to within the
programmed limit.
WARNING
When the MAX PPO
2
alarm is triggered,
ascend immediately until it deactivates.
EFFECTS ON THE CENTRAL NERVOUS
SYSTEM
Oxygen toxicity exposure is monitored by means
of a CNS (Central System Calculation), based
on currently accepted recommendations for
exposure limits.
This toxicity is expressed as a percentage value
which ranges from 0% to 100%. When the CNS
percentage value shown on the display exceeds
75%, an alarm is triggered and the figure will
flash.
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