Bedienungsanleitung Cressi NEWTON (Seite 16 von 23) (Englisch)

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ASCENT RATE

SAFETY STOP

CHANGE MIXTURE WHILE DIVING

MIX1 AND MIX2 MIXTURES SETTINGS VISUALISATION WHILE DIVING

LONG

0.0-3.9

m/min

4.0-7.9

m/min

8.0-11.9

m/min

12.0

m/min

INDEX

DIVING WITH TWO MIXTURES: GAS SWITCHING.

BEFORE A GAS SWITCHING DIVE.

The Newton computer always keeps the AIR DIVE MODE program by default switched on, until the diver sets it

for the use with two mixtures in NITROX DIVE MODE (chapter DIVE SET MODE: Dive parameters setting).

In this case the display will show the word O2 which will stay on during the dive and until Newton does not

change the setting again. You have to set the exact values of oxygen percentage (FO2) contained in the

cylinders to be used during the dive, after having meticulously analysed its content, so the computer is able to

adapt its computing algorithm to the new parameters.

GAS SWITCHING DURING DIVE

During the ascent, if the computer is set in the NITROX DIVE MODE, the MIX1 icon will flash as soon as it

reaches the maximum operating depth (Mod) of the second mixture MIX2 to warn that form that position of

lower height it will be possible to perform the gas switching. At this point to perform this operation you have to

keep the Mode button pressed. In this way the word Mix1 will keep on flashing and in the position of the dive

data appear the pressure (PO2) parameters set and the oxygen percentage (FO2) parameters of Mix1. By

pressing the UP button, the word Mix2 will appear with the parameters if the second mixture. By keeping the

Mode button pressed the second mixture Mix2 setting is confirmed. In case the gas switching is not performed,

to stop the flashing of the Mix1 icon, simply press the Mode button. During dive, the procedure to visualise the

data of the mixture set Mix1 and Mix2 is similar to the one used for gas switching, i.e. keeping the Mode button

pressed the word Mix1 will flash and the pressure (PO2) and percentage of oxygen (FO2) of Mix1 parameters

set will be displayed. By pressing then the UP button, the word Mix2 will appear with the parameters of the

second mixture. Now, pressing the UP or DOWN button the Mix1 data will be displayed.

Remark: The Mix1 main mixture icon will not flash in the cases in which during the descent the maximum

operating depth of the second mixture Mix2 is not exceeded.

DANGER: In case the current depth is greater than the maximum allowable depth of Mix2 the Newton

computer will not allow the gas switching.

ASCENT RATE.

The ascent rate is shown on the display by a dot indicator at the centre, operating according to the table in the

figure alongside. If, during surfacing, the maximum allowed ascent rate is exceeded, the display will show at

the same time the word SLOW and three arrows flashing and an alarm will sound. Under these conditions

surfacing must be stopped until the SLOW icon disappears and the display returns to standard conditions.

DANGER: Surfacing too fast dramatically increases the risk of decompression sickness! Cressi

recommends, at the end of each dive, a safety stop of 3 min at 5-6 metres, which will be assisted by the

computer (see next chapter).

SAFETY STOP

Newton is programmed to automatically signal a safety stop after each dive at a depth greater than 10 m, as

recommended by the training centres and the most recent studies on diving physiology. This stop should be

carried out at a depth between 5 and 3 metres for 3 minutes.

The stop is indicated by the display with the STOP icon; the display, under this condition, clearly indicates the

duration in minutes of the stop and the depth expressed in metres or feet. The safety stop is not mandatory, yet

it is strongly recommended if, for instance, the maximum ascent rate is repeatedly exceeded. Cressi always

recommends respecting it, in order to avoid safety issues.

REMARK: During the safety stop, the maximum depth can be displayed by pressing the UP button.

DANGER: At the end of the safety stop, many divers are used to quickly reach the surface, sometimes

even inflating the BCD. It is a serious mistake which may lead to decompression sickness. The last

metres before surface are, in fact, the most critical and the percentage variations of the pressure are

significant. The last section of the ascent to surface should be covered in no less than a minute.

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