Sos; Desaturation Reset; Diving With Nitrox Or With Another Decompression Gas - Uwatec Meridian Manual

3.9 SOS

If you stay above a depth of 0.8m/3ft for
more than 3 minutes without observing a
prescribed decompression stop, Meridian
will switch into sos mode. Once in sos
mode Meridian will lock up and will be
inoperable as a dive computer for 24 hours.
If it is used for diving within the 24hours
of an sos lock, it will automatically
switch to GAUGE mode and provide no
decompression information.
• Violating a mandatory decompression
obligation may result in serious injury or
death.
• Serious injury or death may result if a diver
does not seek immediate treatment should
any signs or symptoms of decompression
sickness occur after a dive.
• Do not dive to treat symptoms of
decompression sickness.
• Do not dive when the dive computer is in
SOS mode.
SOS
The display shows the same information
as in presence of desaturation, but at the
lowest row SOS is displayed.
3.9.1 Desaturation reset
Meridian allows you to reset the desaturation
in the dive computer. Any tissue saturation
information from a recent dive will be reset
to zero and the dive computer treats the
next dive as a non-repetitive dive. This is
useful when the dive computer is loaned to
SCUBAPRO MERIDIAN
Warning
3. Meridian as a dive computer
another diver who has not dived in the last
48 hours.
F
NOTE: After a desaturation reset the
change between the modes: GAUGE,
APNEA and SCUBA are possible
immediately. However, since the
GAUGE and APNEA modes are not
tracking your tissue nitrogen loading,
it is recommended to keep the initial
intervals between changes on modes.
Warning
Diving after having reset the desaturation
is extremely dangerous and is very likely to
cause serious injury or death. Do not reset the
desaturation unless you have a valid reason to
do so.
F
NOTE: Removing and replacing the
battery will not reset the desaturation.
Meridian stores tissue saturation
information in non-volatile memory.
For the time during which the dive
computer is without battery, the
desaturation calculation is frozen and
resumes from where it had left off as
soon as a new battery is installed.
3.10 Diving with nitrox or with
another decompression
gas
Nitrox is the term used to describe
breathing gases made of oxygen-nitrogen
mixes with oxygen percentage higher than
21% (air). Because Nitrox contains less
nitrogen than air, there is less nitrogen
loading on the diver's body at the same
depth as compared to breathing air.
However, the increase
concentration in Nitrox implies an increase
in oxygen partial pressure in the breathing
mix at the same depth. At higher than
atmospheric partial pressures, oxygen
can have toxic effects on the human body.
These can be lumped into two categories:
Sudden effects due to oxygen partial
pressure over 1.4bar. These are not related
to the length of the exposure to high partial
in oxygen
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