18
Diving with XP AIR
3 Preparation for the dive
3.1 Setting the gas mixture and MOD
!
WARNING
Before every dive and after changing the tank, make sure that the settings for the gas mixture
correspond with the current mixture used. An incorrect setting causes XP AIR to miscalculate this
particular dive. If the fraction of oxygen is set too low this can lead to oxygen poisoning without
warning. If the value is set too high decompression sickness may occur. Inaccuracies in the
calculations are carried over to repetitive dives.
To set the gas mixture, XP AIR must be in user mode.
1. Bridge contacts B and + or B and – until the symbol for the setting
of the O
2
mixture appears.
2. Confirm that you wish to change the displayed oxygen fraction by
bridging B and E.
3. Change the oxygen fraction in increments of 1% by bridging B and
+ or B and –. XP AIR will display the current fraction of oxygen, the
maximum partial pressure limit, ppO
2
max (as pre-set by means of
Dive.Log) and the MOD.
4. Confirm the selected percentage with B and E.
5. By bridging B and + or B and – you can change the MOD for
the chosen fraction of oxygen. XP AIR will now display the
corresponding partial pressure limit (ppO
2
max) for the new MOD.
6. Confirm your MOD settings with B and E.
F
• Without confirmation the display will disappear after 3
minutes and your entries will not be accepted.
• The time to reset the O
2
% mix to air can be set with
Dive.Log between 1 and 48 hours or to "no reset" (default).
3.2
Setting the MB level
See chapter V, ->29
3.3 Preparation for the dive and function check
The following descriptions of the preparation are based on the assumption that the transmitter has
been correctly mounted at the HP outlet of the regulators (->12) and successfully paired with XP AIR
(->13).
1. Mount the regulator together with the transmitter on the tank
!
WARNING
2. If present, check the reserve valve of your tank, the reserve valve must be open.
3. Switch on XP AIR (B-E) and check the test display: Are all elements
of the display activated? Do not use XP AIR if the display does not
show all elements.
4. Open the valve (transmitter will switch on automatically) and check
the tank pressure (after approx. 10 seconds). If the pressure is
insufficient, change the tank.
5. Check the connections and instruments for leaks. Never dive with
leaky equipment!
%
+
–
…
…
O
2
% mix
PpO
2
max.
Max. Operating
%
+
–
ppO
2
max.
Depth MOD
CNS O
2
%
NO
NO
DECO STOP
NO STOP
LEVELSTOP
%