User`s guide

Puck Air Dive computer
12
hazards that are not generally encountered in
recreational dives with compressed air.
In Ean mode, Puck Air 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 Air 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 Air 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 hazards different from those
associated with compressed air. The diver
should be aware of these risks and
understand how to avoid them.

WARNING
Puck Air 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.
DIVE  EAN: CHECKING
THE GENERAL DIVE PARAMETERS
OXYGEN PARTIAL PRESSURE
When the diver reaches a depth at which the
PPO2 exceeds the maximum limit entered
in the corresponding parameter (from 1.2 to
1.6 ATM), Puck Air 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 triggers, ascend
immediately until the alarm condition
ceases. In this case you should finish the
dive and return to the surface. Pay attention
and respect all indicated decompression
and safety stops. Mares recommends not
diving in the next 12 hour period.
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.
DIVE  EAN: PREDIVE
This operating mode remains active until the
diver goes below 1.2 meters (4 feet).
The following details are displayed: (Figure 47):
• type of dive (Ean)
• units of measurement (m-°C or ft-°F)
• type of water (salt, fresh)
• altitude program and level (if enabled)
• personal correction factor and level (if
enabled)
• icon for %O
2
• tank pressure in bar or psi
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2
4
5
6
7
8
9
10
11
3
Fig. 47
NOTE
If you stay in Predive mode for more than
10 minutes without pressing the button,
Puck Air will turn off.
NOTE
Before every dive, it is advisable to
enter Set Dive mode and check all
the parameter settings and the Ean
parameters in particular.

WARNING
We recommend before you begin diving,
you always put Puck Air into Predive mode.
Early in your dive, always check that the
dive computer is switched on.
DIVE  EAN:
“NODECOMPRESSION” DIVE
When the diver descends below 1.2 meters
(4 feet) Puck Air automatically switches to
Dive Mode and starts displaying the dive
data. Remaining in this mode for more than
20 seconds will make Puck Air begin recording
the dive details in the Logbook memory.
The following details are displayed (Figure 48):
• current depth (in “m” or “ft”)
• no-decompression time remaining,
expressed in minutes
• “no dec” icon
• altitude program and level (if enabled)
• personal correction factor and level
(if enabled)
• the % CNS
• the duration of the dive so far (dive time)
in numbers
• the Deepstop icon (if the stop is required)
• tank pressure in bar or psi
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2
4
5
6
7
8
9
10
11
3
Fig. 48
Pressing the button will display (Figure 49):
• the maximum depth reached
• the Deepstop icon if applicable
• altitude program and level (if enabled)
• personal correction factor and level
(if enabled)
• no-decompression time remaining,
expressed in minutes
• the current temperature
• “no dec” icon
• air time remaining at the current depth
• ascent rate in analog and digital mode
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1
2
4
5
6
7
8
9
10
11
3
Fig. 49
Pressing the button again will display:
• type of dive (Ean)
• altitude program and level (if enabled)
• personal correction factor and level
(if enabled)
• units of measurement (m-°C or ft-°F)
• type of water (salt, fresh)
• the %O
2
• tank pressure in bar or psi
NOTE
Hold down the button for 4 seconds to
activate the display backlight.
DIVE  EAN:
“DECOMPRESSION STOP” DIVE
If the diver does not ascend when the residual
time has expired, Puck Air switches to
“decompression-stop” mode, indicated by
the appearance of the “dec” message and