Bedienungsanleitung Scubapro MERIDIAN (Seite 38 von 58) (Englisch)

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3. Meridian as a dive computer

SCUBAPRO MERIDIAN

3. Meridian as a dive computer

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 1.4 bar are tolerable,

and several training agencies advocate

maximum oxygen partial pressures up to

1.6 bar.

Long exposure effects to oxygen partial

pressures over 0.5 bar 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.

Meridian treats high ppO

and long

exposure effects in the following ways:

Against sudden effects: Meridian has

an MOD alarm set for a user-deﬁned

ppO

max. As you enter the oxygen

concentration for the dive, Meridian shows

you the corresponding MOD for the deﬁned

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 3.2 Gas settings

for more information on how to change this

setting.

Against long exposure effects: Meridian

“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 Meridian will activate an

alarm when this level of CNS O

is reached.

Meridian can also warn you when the CNS

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: 13 m / 43 ft

32% 6 m/20 ft

36%: 4m/13ft

NOTE:

• the O

concentration of Gas d can

only be set to a value higher than the

concentration for Gas 1.

• O

concentration setting shown “- -“

means that gas is disabled.

• Meridian 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 a maximum value of

ppO2max of 1.6bar.

• For oxygen concentrations of 80%

and higher, the ppO

max is fixed at

1.6 bar and cannot be changed.

• The MOD for Gas d is the switch depth

for that gas. This is what Meridian

uses for its calculation, warnings and

suggested switch point.

• When diving with more than one gas

mixture, the Nitrox reset time function

(described in section 2.3.5) has the

following effect:

• Gas 1 is set to 21%

• Gas d is set to OFF.

3.10.1 Diving with two gas mixtures

Meridian is equipped with the ZH-L8

ADT MB PMG algorithm. PMG stands for

Predictive Multi Gas, meaning that when

you program more than one gas mixture,

Meridian will predict the switch to the

higher oxygen concentration gas at the

depth that you speciﬁed and alert you at

all times with a decompression schedule

comprehensive of both gas mixtures that

you programmed. In other words, you

get full credit at any point during the dive

for all the extra gas that you are carrying

with you. At the same time Meridian can

also show you what the decompression

schedule would be if you were to ﬁnish

the dive using only the gas mixture that

you are currently breathing from, so that

you can be prepared in the event that

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