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LUNA 2.0 AI USER MANUAL
10m
20m
30m
40m
DIVE TIME
8 min 16min 24 min 32 min 40 min 48 min
SAFETY STOP
PDI STOP
Dive Profile 1
Dive Profile 2
Deep Stop
PDIS Profile 1 PDIS Profile 2
DEPTH
8 min 16min 24 min 32 min 40 min 48 min
10m
20m
30m
40m
SAFETY STOP
PDI STOP
Deep Stop
PDIS Profile 1
Dive Profile 1
Dive Profile 2
PDIS Profile 2
DIVE TIME
DEPTH
3 .15 .2 How does PDIS work?
The mathematical decompression model in the LUNA 2.0 AI, called ZH-L16 ADT MB PMG, tracks your
decompression status by dividing your body into 16 so-called compartments and mathematically following the
uptake and release of nitrogen in each with the appropriate laws of physics. The various compartments simulate
parts of your body such as the central nervous system, muscles, bones, skin and so on.
The depth of the PDI stop is calculated as that at which the leading compartment for the decompression calculation
switches from on-gassing to off-gassing, and the diver is advised to perform a 2-minute stop above the displayed
depth (this is the opposite of a decompression stop, where you are asked to remain just beneath the displayed
depth). During this intermediate stop, the body is not taking up any more nitrogen in the leading compartment,
but rather releasing nitrogen (though under a very small pressure gradient). This, combined with the relatively high
ambient pressure, inhibits bubble growth. It should be noted that the 4 fastest compartments, up to 10-minute
half-times, respectively, are not considered for the determination of the PDI stop depth. This is due to the fact that
these compartments are only “leading” for very short dives, for which an intermediate stop is not required at all.
F
NOTE: The PDI stop is not a mandatory stop, and it is NOT a substitute for the 3- to 5-minute safety stop at
5m/15ft.
WARNING
Even when performing a PDI stop, you still MUST perform a safety stop at 5m/15ft for 3 to 5 minutes. Performing a 3- to
5-minute stop at 5m/15ft at the end of any dive remains the best thing you can do for yourself.
3 .15 .3 Diving with PDIS
When the calculated PDI stop is deeper than 8m/25ft, the LUNA 2.0 AI shows it on the display and continues to do
so until you reach the displayed depth during an ascent. The displayed value changes during the dive as the LUNA
2.0 AI tracks the uptake of nitrogen in the 16 compartments and updates the PDIS depth accordingly to reect the
optimum at all times.
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