Bedienungsanleitung Cressi Archimede II (Seite 17 von 42) (Englisch)

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3.2. - HYPER-OXYGENATED (NITROX) MIXTURES

DIVE

3.2.1. - Before a Nitrox dive.

 DANGER: the use of the computer with hyper-oxyge-

nated (Nitrox) mixtures is exclusively intended for divers

who have attended a full training course on the use of

such mixtures.

The Nitrox program for Archimedes II computer allows

making saturation and de-saturation computations for a dive

by using up to two different nitrox mixtures and is switched on

any time the parameters of program the primary

mixture FO2 on Mix1=21% and second mixture Mix2=off, are

changed. In this case the display will show (Nitrox) icon (pictu-

re 12) which will stay on during the dive and until Archimedes II

remains set on Nitrox parameters.

Once Nitrox program is on, it is necessary to set Archimedes II

computer with the exact values of oxygen percentage (FO2)

contained in the cylinders to be used during the dive, after

having analyzed their content, so the computer is able to adapt

its computing algorithm according to the new set parameters.

WARNING: Archimedes II computer always keeps

program switched on for air dives, until the diver

sets it for the use with Nitrox mixtures (chapter 2.3.1– Dive

parameters setting)



DANGER: Do not dive with cylinders containing Nitrox

mixtures without checking their oxygen percentage.

WARNING: Before diving, always check the oxygen per-

centage of the mixture(s) set on the computer. This is done

on surface by depressing button A ( ) which allows visua-

lization of the previously set parameters.

WARNING: Under the same dive conditions, a Nitrox mix-

ture requires longer no decompression times than air. It is

recommended to comply with the maximum depth allowed

by the selected Nitrox mixture.

Related topics:

• 2.3.1. - parameters setting.

• 2.3.3. - Rapid visualization of set data.

• 3.3. - Nitrox parameters setting.

• 3.3.3. - Mixture changing by diving.

• 3.3.4. - CNS toxicity display.

• 3.3.5. - PO2 alarm.

3.3. - Nitrox parameters setting.

3.3.1. - Partial pressure setting (PO2).

Archimedes II is set at the factory on a basic PO2 value of 1.4

bar for both mixtures of Nitrox and air dives, in order to gua-

rantee the maximum safety during dives.

It is possible to modify the PO2 setting on values between 1.0

bar and 1.6 bar. Should you elect to increase the dive’s margin

of safety, it is possible to set PO2 on lower values, down to a

minimum of 1.0 bar. It is explained in paragraph 2.3. how to

carry out the selection of values. To do so, depress the central

button B (Mode) to the ( ) menu, shown in picture 3, and

the parameters will be modified according to the following

scheme: by depressing button A ( ) it is possible to select, in

Manuale ARCHIMEDE II 2008:Manuale 6 26-06-2008 8:26 Pagina 174

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