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set maximum oxygen partial pressure. Tissue calculation during dive is
based on the mix you have selected.
The Vytec allows gas change to enabled gas mixes during the dive. Gas
change is made by the following procedure:
• Press the MODE button until the Vytec starts to show blinking
“MIX” instead of temperature/cylinder pressure in the lower left
display (Fig. 3.27).
• Scroll between enabled mixes with PLAN and TIME buttons
• Mix number, O2% and PO2 for the mixes are shown when
scrolling. If set PO2 is exceeded it will be shown with the value
blinking and upward pointing arrow
• Select mix by pressing MODE.
• If no button is pressed in 15 seconds the Vytec will go back to
dive display without changing gas mix. The Vytec does not allow
change to a gas when set PO2 is exceeded. In such a case the
mix is shown but cannot be selected (“select” text is not shown).
Upon ascent the Vytec prompts you to change gas when the PO2 level
you have set for next mix is allowing a gas change. The prompt is an
audible three beeps and the current mix O% starts to blink.
NOTE: The Vytec will not let you switch to gases which maximum PO2
levels are exceeded.
3.5. DIVING IN GAUGE MODE
If set to Gauge mode, the dive computer can be used as a bottom timer
for diving with technical diving mixed gases. If you are trained for techni-
cal diving and you plan to use Gauge mode on a regular basis, it may
be preferable to set the instrument permanently to its Gauge mode. The
Gauge mode is enabled in the MODE-SET-SET PREF-MODEL submode
(see section 4.3. “Set Modes”).
If set to Gauge mode the text GAUGE is shown after activation (Fig. 3.4.).
In the Gauge mode the total Dive Time is always displayed in minutes
in the lower right corner. In addition a Dive Timer in the center window
displays time in minutes and seconds. The center window Dive Timer is
activated at the start of the dive and it can be reset during the dive and
used as a stopwatch by pressing the PLAN button.
When the PLAN button is pressed during the dive:
• A special mark, bookmark is written in the profi le memory.
• The Dive Timer shown in the center window is stopped, reset and
started again.