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Of course, the diver must analyze the subsequent dive‘s mixtu-
re and set the computer with the new FO2 value.
Should you neglect to set the new FO2 percentage on the
computer, you would be warned by the PO2 alarm (picture 15),
at a depth of only 13 ft. (toxicity limit of an EAN 99% mixture, with
PO2 set on 1.4). This is done to warn the diver and get him to
correctly reset his dive’s parameters, by surfacing at once.
Should the dive be continued, a second PO2 alarm at 1.6 bar
(that is at 20 ft.) would start.
3 Should the FO2 value be set and no dive carried out, the
computer will store the set value in the memory until the
current day’s midnight, when it will reset it on the safety
value of FO2 = 99%. The dive’s parameters setting will
change as shown in picture 14.
Related topics:
• 2.4.1. - DIVE program parameters setting
• 3.3.1 - Partial pressure setting (PO2)
• 3.3.3. - CNS toxicity display (OLI).
• 3.3.4. - PO2 alarms.
• 4.1.1. - Surface interval after a DIVE program
3.3.3. – CNS toxicity display
Cressi sub computer displays a graph of the oxygen
toxicity level to the Central Nervous System (CNS). The toxicity
level depends on the oxygen partial pressure and on the expo-
sure to high oxygen partial pressures (PO2). Picture 16 repre-
sents the display’s 8 pixels column which shows the increasing
accumulated oxygen amount. When all 8 pixels light up, 100%
of the maximum tolerance allowable to the CNS has occurred
and serious danger of an oxygen intoxication exists.
It is important therefore to understand, monitor and control
the oxygen toxicity level.
In order to reduce the risk of oxygen intoxication,
displays a graph which is easy to be read in any situation.
When the oxygen level reaches warning values, next to the
maximum allowable toxicity (corresponding to 7 of 8 lighted
pixels), the graph starts flashing along with the display and an
alarm starts sounding which lasts 15 seconds, showing the
proximity of a CNS toxicity level.
When the eighth pixel lights up as well, a second (100%)
alarm starts: the graph and display start flashing and an alarm
starts sounding, as long as the diver does not surface, and
the oxygen partial pressure does not decrease. Only when
the eighth pixel turns off, the graph stops flashing, while the
alarm will be entered in the Logbook.
NOTE: The result of the oxygen exposure computations
is approximated to the above percentage value.
Related topics:
• 3.1. - Air dive
• 3.2. - Hyper-oxygenated Nitrox mixture dive
• 3.3.1. - Partial pressure setting PO2.
• 3.3.2. - Nitrox mixture oxygen fraction (FO2%).
• 3.3.4. - PO2 alarms.
• 4.2. - Dive logbook
3.3.4. - PO2 alarms.
Cressi-sub computer is able to constantly monitor
another basic parameter relating to oxygen, and that is O2
partial pressure value (PO2). Oxygen toxicity may be caused
both by an excessive accumulation (CNS toxicity seen in the
previous chapter) and by exceeding the maximum PO2,
ENGLISH
EDY.qxd:EDY Manuale2006-2.qxd 20-06-2008 11:51 Pagina 211
22


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