Alternate displays during a dive with two gases
All displays time out after 5 seconds and the default display is shown again.
(Only exception is the temperature, screen 2 below.)
1
The default display shows the predictive decompression prognosis, which assumes the diver will
switch to the deco gas at the specified switch depth. In the bottom left corner the temperature is
displayed unless the current depth is 1m/3ft shallower than the max depth, in which case the max
depth is displayed.
2
Upon pressing the right button, the temperature and the current O
2
% are shown in the lower row.
O
2
% will time out after 5 sec while the temperature remains.
3
Upon pressing the right button, "GAS 1" or "GAS d" appears in the middle row to indicate the cur
-
rently active gas and the MOD appears in the bottom left corner. "GAS 1" or "GAS d" will time out
after 5 seconds unless the right button is pressed again.
4
In case that gas 1 is the active gas, pressing the right button one more time shows O
2
% of gas 1 in
the bottom right corner and the decompression information in case the deco gas is not used (decom-
pression information relative to gas 1 only). This is the calculation that Aladin would switch to in case,
having reached the switch depth, the diver did not confirm the switch. The decompression information
and the O
2
% blink.
5
If an MB level greater than L0 is active, pressing the right button one more time shows the predictive
decompression information and in the bottom left corner the currently active MB level.
6
Pressing the right button again shows the predictive decompression information relative to L0 togeth
-
er with the L0 symbol at the bottom left.
7
One more right button push shows the decompression information relative to L0 if only gas 1 is used,
with the decompression information and the O
2
% of gas 1 blinking.
8
Upon pressing the right button again, the time of day appears in the middle row.
• The time to reset the
O
2
% mix to air can be set with SmartTRAK between
1 hour and 48 hours or to "no reset" (default).
After the reset, the oxygen fraction of gas 1 is set to 21% and gas D is set to
"– – O
2
%" (single gas dive).
Switching between single-gas and two-gas diving
If gas D is not going to be used during the next dive you can either set it to
"– – O
2
%" (->37, point 2) or you can turn off the deco gas option in SET 1.
When you turn off the deco gas option in SET 1, the setting in the GAS D O
2
menu remains but Aladin calculates the dive using gas 1 only.
If the deco gas option is turned off, the GAS D O
2
menu will display OFF in the
lower left corner (instead of an MOD) and the ppO
2
setting will not appear.
VI Diving with two gas mixtures
Predictive decompression prognosis
The calculation of decompression data is based on the assumption that the change of gas mixture will be
performed at the previously selected switch depth (MOD gas D). If a diver ignores the required change or
changes the mixture belatedly, Aladin will readjust the decompression calculation accordingly. In case of
an ignored switch the dive computer will then base its calculations on the assumption that the diver will
ascend to the surface with gas 1.
Functions during a dive with two gas mixtures
Diving with more than one gas mixture represents a much higher risk than
diving with a single mixture, and mistakes by the diver may lead to serious
injury or death.
During dives with several gas mixtures, always make sure you are breathing from the tank you intended
to breath from. Mark all your tanks and regulators, so they can under no circumstances be mixed up!
Before every dive and after changing a tank, make sure that each gas mixture is set to the correct value
for the corresponding tank.
VI UWATEC Aladin TEC 2G
38
