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Cressi NEWTON Manual

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WHILE DIVING
COMPUTER FUNCTIONS
The Newton computer can be set in three diverse modes:
1) AIR DIVE MODE if dives are performed with air and you want to use a decompression computation.
2) NITROX DIVE MODE if dives are performed with Nitrox and you want to use a decompression computation.
3) GAGE if you do not want to use a decompression calculation but you have the time and depth indications.
REMARK: The Newton computer is factory set on the AIR DIVE MODE function for air dives with the PO2
pressure set on 1.4 and the FO2 fraction of the oxygen set on 21%. To set FO2 values different from Air 21%
activate the NITROX DIVE MODE.
WARNING: Before diving make sure that the computer is not locked (check for the presence of the word
"lock" on the upper left part of the screen). In this case, unlock it, placing the SET LOCK menu in the OFF
position. The word "lock" will disappear.
WARNING: Before diving set the computer to PRE-DIVE by pressing the MODE button without releasing
it, or by accessing the ENTR-DIVE menu. In this way, the computer will start processing the dive
parameters within a maximum of 2 seconds after reaching a depth of 1.2 m. In any case, the dive
computer is automatically activated within 20 seconds of reaching a depth of 1.2 m.
DIVING WITHIN NO DECOMPRESSION LIMITS
AIR DIVE MODE FUNCTION: Dive with air.
When set in AIR DIVE MODE, during a dive within the no-decompression limits, the display will show the
following information:
1) Current deep value (Depth m.).
2) Non decompression time (No Deco min.).
3) Max depth reached (Max m.).
4) Elapsed dive time (Dive.T min.).
5) Ascent rate indicator.
6) Indicator or altitude level (if set).
7) Current temperature, expressed in ºC or ºF.
Further important information may be obtained by pressing the UP button during the dive and represent:
1) Maximum PO2 set.
2) Oxygen percentage of the selected mixture (Air if FO2=21% and PO2=1.4).
3) Maximum depth which can be reached depending on the maximum PO2 set.
4) The Safety Factor SF.
NITROX DIVE MODE FUNCTION: Dive with Nitrox.
The Newton computer keeps the setting of the percentage of Oxygen FO2 until the diver manually resets it to
different values or until the DIVE MODE menu is set in AIR. It is important to understand that:
Artificial respiratory mixtures may expose the diver to significant risks, unless they are perfectly known,
analysed and studied in all the aspects related to underwater diving activities. It is mandatory to understand
that THE MIXTURE BEING BREATHED MUST BE EXACTLY EQUAL TO THE ONE SET ON THE
COMPUTER. OTHERWISE, DECOMPRESSION AND TOXICITY INFORMATION provided by the computer
WILL BE DANGEROUS FOR THE LIFE OF THE DIVER Before, after, and during Nitrox dive, it is mandatory to
verify the percentage of Oxygen so that it exactly corresponds to the one in the cylinder.
BEFORE A NITROX DIVE.
The Newton computer always keeps the AIR DIVE MODE program switched on, until the diver sets it for the
use with Nitrox mixtures in NITROX DIVE MODE (chapter DIVE SET MODE: Dive parameters setting). In
this case the display will show the MX:1 icon which will stay on during the dive and as long as Newton remains
set on NITROX MODE. Once the Nitrox program is on, you have to set the exact values of oxygen percentage
(FO2) contained in the cylinder 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.
DANGER: The use of the computer with hyper-oxygenated (nitrox) mixtures is exclusively intended
for divers who have attended a full training course in the use of such mixtures.
DANGER: do not dive with cylinders containing nitrox mixtures whose percentages of oxygen has not
been personally checked.
IMPORTANT: Check the FO2 value (percentage of oxygen) set on the computer prior to diving! This can
AIR DIVE
WHILE DIVING WITH NITROX
WHILE DIVING IN ALTITUDE
14
LIGHT
INDEX
AUTOMATIC
RETURN OR
WITH LONG
MODE BUTTON
BEEP
AUTOMATIC
RETURN OR
WITH LONG
MODE BUTTON
BEEP
… 14 …


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