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VERSION 1.0VERSION 1.0
VERSION 1.0VERSION 1.0
VERSION 1.0
CREATING PROFILES
USING CLOSED CIRCUIT
To create dive profiles where the diver will be using a
closed circuit rebreather, the user needs to:
1. Enter the Preferences Tab and change the Scuba
Type from Open Circuit to Closed Circuit.
2. Set the High Set Point and Low Set Point for the
rebreather you are using.
NAUTILUS ALPHA VERSION assumes binary diluent
gases for the calculations when using a
CCR. Meaning, if you are using Heliox, it
assumes you will be using only helium and
oxygen and that your unit will adjust the
oxygen accordingly with the balance being
helium. If you are using nitrox, then the unit
will adjust for the oxygen accordingly with the balance
being nitrogen.
Most CCR divers will have the diluent for helium dives set
up as a 17/83 oxygen/ helium mixture and will have
oxygen on board. For nitrox dives they will have air 21/
79 oxygen/nitrogen as the diluent and will have oxygen on
board as well.
NAUTILUS does not presently calculate CCR
decompression using trimixture diluents.
3. SAC for the “Deco / Bail Out” should off-board OC
gasses be desired.
4. Continue to set the other preferences.
5. Press SAVE -- the preferences are now saved.
Next enter the Gas Setup Tab
Under the Gas Setup Tab, the CCR user can deselect all
gas mixtures OR can select a bailout gas or off-board
decompression gasses. When gases are either selected or
deselected press SAVE and the gas portfolio will be
saved.
ENTER THE CCR PROFILE
Select the Generate Profile tab. Enter the Depth and
Time and select the Setpoint gas in the pull-down to the
right of the minutes box then press DIVE.
After the dive has completed the first leg the user can
decide on how the decompression will be completed by
selecting the appropriate decompression gases and /or a
setpoint.
If the decompression will be with all CCR then the user
need only select that set point gas and press DECO. The
decompression will now be completed.
If an off-board decompression gas will be used, tell
NAUTILUS to decompress to the desired depth or the
MOD of the off-board decompression gas using the CCR
set point, then select the off-board decompression gas for
completion of the decompression. (eg: decompress to
habitat depth, then complete decompression with OC
gas.)
NAUTILUS will then calculate the decompression
accordingly with the gas shift. If air breaks were selected,
then it will calculate those as well.
