Technical information

1 Diving at Reduced Risk with Aladin

Air Z O

IV Uwatec

Aladin

Air Z O

1.3 Minimizing risk on repetitive dives

With consecutive repetitive dives, there will be excess nitrogen in the body due to the accumulation of

nitrogen on the preceding dives. Depending on the length of the surface interval, there could even be

gaseous nitrogen (microbubbles) in your body. This accumulation of both absorbed as well as gaseous

nitrogen in the body can greatly increase the risk of decompression sickness on subsequent dives. That risk

can be minimized.

– Respect the rules for the first dives.

– Wait until <CNS O

LIMIT> is less then 40%.

– Match gas mixture to the intended dive.

– Descend less deep for the repetitive dive than for the previous dive.

– Plan for a minimum surface interval of three to four hours.

– Do not attempt to repetitive dive if the <Atn> is visible on the display.

– Take a day off from diving every week.

– Repetitive dives after exchanging the dive computer: Wait at least 24 hour before you start with the

repetitive dive.

1.4 Response in increased risk situations

If the dive includes an increased risk situation, Aladin

Air Z O2 reacts automatically to warn the diver of

this risk and increase required decompression, as the case may be. A change of decompression may

be indicated to minimize the risk. The diver can further reduce the risk through his conservative diving prac-

tices on the next dive and at the same time prevent long decompression stops.

A few examples are on the following pages:

Situation 1: The diver ascends too rapidly:

Reaction of computer: The model calculates the formation of bubbles due to the excessively rapid

ascent. No-stop time is shortened or a longer (and eventually at greater depth)

decompression prescription is displayed in order to assure increased decom-

pression. See pages 49, 57 and 58.

Recommended response of the diver

During the dive: Observe the new decompression prescription shown by Aladin

Air Z O