Bedienungsanleitung Scubapro Aladin Square (Seite 32 von 52) (Englisch)

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ALADIN SQUARE USER MANUAL



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.



NOTE: Removing and replacing the

battery will not reset the desaturation.

Square stores tissue saturation

information in non-volatile memory. For

the time during which the 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.

2.5 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 in oxygen

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

pressure oxygen, and can vary in terms

of the exact level of partial pressure they

happen at. It is commonly accepted that

partial pressures up to 1.4bar are tolerable,

and several training agencies advocate

maximum oxygen partial pressures up to

1.6bar.

Long exposure effects to oxygen partial

pressures over 0.5bar due to repeated and/

or long dives. These can affect the central

nervous system, cause damage to lungs or

to other vital organs. Long exposures can

be divided to more severe Central Nervous

System effects and less dangerous long

term Pulmonary Toxicity effects.

Square treats high ppO

and long exposure

effects in the following ways:

Against sudden effects: Square has an MOD

alarm set for a user-deﬁ ned ppO

max. As

you enter the oxygen concentration for the

dive, Square shows you the corresponding

MOD for the deﬁ ned ppO

max. The

default value of ppO

max from the factory

is 1.4bar. This can be adjusted to your

preference between 1.0 and 1.6bar. It can

also be turned OFF. Please refer to chapter

Gas settings for more information on how

to change this setting.

Against long exposure effects: Square

“tracks” the exposure by means of the

CNS O

clock. At levels of 100% and higher

there is risk of long exposure effects, and

consequently Square will activate an alarm

when this level of CNS O

is reached.

Square can also warn you when the CNS O

level reaches 75% (see section CNS alarm).

Note that the CNS O

clock is independent

of the value of ppO

max set by the user.

The CNS O

clock increases when the

oxygen partial pressure is higher than 0.5bar,

and decreases when the oxygen partial

pressure is lower than 0.5bar. Hence, while

on the surface breathing air you will always

be decreasing the CNS O

clock. During the

dive, the depth at which 0.5bar is reached

for various mixes is as follows:

Air: 13m/43ft

32%: 6m/20ft

36%: 4m/13ft



NOTE: The O

concentration of gas

d can only be set to a value higher

than the O

concentration for gas 1.

Square requires that the MODs of gas

1 and gas d be at least 3m/10ft apart.

Setting the ppO

max value to OFF applies

to gas 1 only. Gas d is always limited to

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