14
3 Preparation for the Dive
III Uwatec
®
Smart dive computers
3.1 Setting the gas mixture
Before every dive and after changing the tank, make sure that the setting of the
gas mixture corresponds to the actual mixture used. An incorrect setting causes
the Smart 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 damage due to nitrogen saturation may occur without a
warning from the Smart.
To set the gas mixture, the Smart must be in user-mode.
1. Bridge contacts B and + or – until the symbol for the setting of the O
2
mix-
ture appears.
2. Confirm that you wish to change the displayed oxygen fraction by bridging
B and E.
3. Change the oxygen fraction by bridging contacts B and + to increase or B
and – to decrease (21-100%).
4. Confirm with B and E the selected percentage.
Without confirmation the display will disappear after 3 minutes and your
entries will not be accepted.
If you exit the O
2
% Mix function automatically without confirming, the new
settings will not be accepted and the Smart reverts to the previous settings.
The time to reset the O
2
% mix to air (21% O
2
) can be set with SmartTrak
between 1 hour to "no reset" (default).
3.2 Setting the MB-level See chapter IV, page 24.
3.3 COM Preparation for the Dive with Smart Com
The following description of the preparation of a dive is based on the assumption that the high-pressure hose
is correctly mounted on the HP-outlet and the Smart Com is connected with the HP-hose (see page 10).
If the high-pressure hose is not correctly mounted, it will not perform pro-
perly and serious injury or death may result.
1. Mount the regulator together with the high-pressure hose on the tank.
2. Check the reserve valve of your tank (if fitted), the reserve valve must be open.
3. Open the valve and check the tank pressure (after approx. 10 sec.). If the
pressure is insufficient, change the tank.
…
…
3.4 Inspection
Make an inspection before each dive:
1. Switch on the Smart (B-E).
2. Check the test display: Are all the elements of the display activated? Use
the Smart only if all elements of the display are activated.
3. COM Check the connections and instruments for leaks. Never dive with
leaky equipment!
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