Bedienungsanleitung Cressi Archimede II (Seite 20 von 42) (Englisch)

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 DANGER: As a safety measure, in order to avoid the

involuntary setting of nitrox mixtures at depths where they

might be toxic (excessive PO2), Archimedes II does not

allow the mixture change if the new mixture’s PO2 is higher

than the one set on the computer (1.4 bar = default value).

The maximum PO2 alarm will sound if you attempt to set

nitrox mixtures at depth.



DANGER: Should both mixtures’ FO2 values be set and

no dive carried out, the computer will store the set values in

the memory until the current day’s midnight, when they

both will be reset on a value of 99%.

 DANGER: After 10 minutes from the end of a dive, the

computer resets the mixtures’ FO2 on a safety value of

99%, waiting for the user to set the correct values relating to

the new mixtures. The display will show "--" in the place of

FO2%, as in (picture 12b).

 DANGER: Always check, prior to diving, the FO2 and

PO2 values of both set mixtures! While on the surface, it is

possible to check their values, by depressing button A ( ),

which visualizes the previously set parameters.

 DANGER: do not dive with bottles containing Nitrox

mixtures, without having personally checked their oxygen

percentage.

Related topics:

• 2.3.1. - program parameters setting

• 3.3.1. - PO2 setting

• 3.3.2. - Nitrox mixture/s oxygen fraction F02 setting

• 3.3.4. - CNS toxicity display.

• 3.3.5. - PO2 alarms.

3.3.4. - CNS toxicity display

Archimedes II computer is display a graph of the Central

Nervous System toxicity level as to the oxygen level. Its toxi-

city level is bound with the oxygen’s partial pressure and

with the exposure to high oxygen partial pressures (PO2).

Picture 15 represents the UFDS display’s 8 pixels column,

which shows the increasing accumulated oxygen quanti-

ties. When all 8 pixels light up, 100% of the maximum tole-

rance allowable to the CNS has occurred and serious dan-

ger of an oxygen intoxication exists.

It is important to understand, monitor, and control the oxy-

gen toxicity level.

In order to reduce the risk of oxygen toxicity, Archimedes II

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, a second (100%) alarm

starts sounding. At this time the graph and display flash and

the alarm sounds, until the diver surfaces, letting the oxygen

partial pressure decrease.

When the eighth pixel turns off and the graph stops flashing,

the alarm will be entered in the Logbook.

ENGLISH

Manuale ARCHIMEDE II 2008:Manuale 6 26-06-2008 8:26 Pagina 177

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