ALADIN ALADIN AIR Z O2, Operating Manual, Page: 14 / 104

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3 Aladin
®
Air Z O
2
– Your Personal Companion / 4 The Calculation Model ZH-L8 ADT
I Uwatec ® Aladin ® Air Z O
2
You must strictly observe all optical and acoustic alarms and take appropriate
action based upon those alarms to avoid serious injury or death from decom-
pression sickness!
• By using the Aladin ® Air Z O
2
‘s logbook, a diver may directly call up information from the last 19 dives.
The last 37 dives and 175 minutes of dive profile in intervals of 20 seconds can be read out into a
MemoMouse, which can be later interfaced with a personal computer (windows). The MemoMouse can
store up to 58 hours of diving data.
• The Aladin ® Air Z O
2
is designed to be mounted on the diver‘s left or right wrist, which offers the maxi-
mum freedom of movement as well as easy operation and use.
4 The Calculation Model ZH-L8 ADT
4.1 Description
The Aladin
®
Air Z O
2
uses the decompression calculation model known as the ZH-L8 ADT. This model uses
eight compartments or “tissue“ groups with nominal half time periods from 5 to 640 minutes. This model
differs considerably from other models by its consideration of the following additional physiological
processes:
1.Blood perfusion to the body‘s organs is not constant. Skin and muscle tissues are in particular subject
to changes in blood perfusion, depending on temperature and workload. Changes in blood perfusion to
these organs change their nitrogen saturation tolerance. The model used by the Aladin
® Air Z O
2
takes
these effects into account and thus the “skin“ and “muscle“ compartments in the Aladin ® Air Z O
2
show
variable half-time periods and saturation tolerances. Decompression information is calculated according
to the diver‘s individual workload and decrease in skin temperature. The decrease in skin temperature is
based upon the water temperature and the dive time. By considering these changes in saturation, the
time that must be spent at the surface prior to flying may be considerably increased, depending upon
the depth, time, and temperature of a dive, as well as the diver‘s workload during that dive.
2.The decompression model used by the Aladin ® Air Z O
2
considers nitrogen in both its dissolved as well
as its gaseous phase (microbubbles). Formation of microbubbles is considered to be a strong indicator of
a high risk of decompression sickness. The Aladin
® Air Z O
2
model calculates the formation of micro-