SUUNTO VYTEC - Manual (Page 32)

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DISPLAY ABOVE THE CEILING
If you ascend above the ceiling during a de-
compression stop, a downward pointing arrow
will appear and a continuous beeping starts
(Fig. 3.19.). In addition, an error warning Er
reminds you that you have only three minutes
to correct the situation. You must immediately
descend to or below the ceiling.
If you continue to violate the decompression,
the dive computer goes into a permanent
Error Mode. In this mode the instrument can
only be used as a depth gauge and timer. You
must not dive again for at least 48 hours (see
also section 3.9. “Error Conditions”).
3.4. DIVING IN NITROX MODE
3.4.1. Before Diving
The Vytec has three operating modes: Air
mode for diving with standard air only, Nitrox
mode for diving with oxygen enriched (EANx)
mixtures and Gauge mode for use as bottom-
timer. The Nitrox mode is enabled in the
MODE-SET-SET PREF-MODEL submode
(see section 4.3. “Set Modes”).
If set to the Nitrox mode, the correct oxygen
percentage of the gas in your cylinder must
always be entered into the computer to en-
sure correct nitrogen and oxygen calcula-
tions. The dive computer adjusts its mathe-
matical nitrogen and oxygen calculation mod-
els. The dive computer will not accept frac-
tional percentage values of oxygen concen-
tration. Do not round up fractional percentag-
es. For example, 31.8% oxygen should be
entered as 31%. Rounding up will cause nit-
rogen percentages to be understated and will
affect decompression calculations. If there is
a desire to adjust the computer to provide
more conservative calculations, use the per-
sonal adjustment feature to affect decompres-
sion calculations or reduce the PO
2
setting to
DIVE TIME T
C
B
m
CEILING
ASC TIME
AIR TIME
bar
Fig. 3.17. Decompres-
sion dive, above floor.
Upward pointing arrow
has disappeared and
ASC TIME label has
stopped blinking, which
means that you are in the
decompression range.
Fig. 3.18. Decompres-
sion dive, at ceiling
zone. Two arrows point
at each other (“hour
glass”). You are in the
optimum ceiling zone at
3.5 m [11 ft] and your
minimum ascent time is
5 minutes. Pressing
TIME button activates
alternative display.
DIVE TIME T
C
B
m
STOP
CEILING
ASC TIME
MAX
TIME
AIR TIME
bar
°C