18
3 Preparation for the dive
UWATEC
®
Smart dive computers
3.1 Setting the gas mixture and MOD
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 Smart Z 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, Smart Z 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 –. Smart Z will display the current fraction of oxygen, the maximum
partial pressure limit, ppO
2
max (as pre-set by means of SmartTRAK) 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. Smart Z will
now display the corresponding partial pressure limit
(pp
O
2
max) for the new MOD.
6. Confirm your MOD settings with B and E.
•
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 SmartTRAK between 1 and 48 hours
or to "no reset" (default).
3.2 Setting the MB level See chapter V, ->28
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 Smart Z (->13).
1. Mount the regulator together with the transmitter on the tank
2. If present, check the reserve valve of your tank, the reserve valve must be
open.
3. Switch on Smart Z (B-E) and check the test display: Are all elements of
the display activated? Do not use Smart Z 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!
