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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 bottomtimer. 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 al-
ways be entered into the computer to ensure
correct nitrogen and oxygen calculations. The
dive computer adjusts its mathematical nitro-
gen and oxygen calculation models. The dive
computer will not accept fractional percentage
values of oxygen concentration. Do not round
up fractional percentages. For example, 31.8%
oxygen should be entered as 31%. Rounding
up will cause nit rogen percentages to be under-
stated and will affect decompression calcula-
tions. If there is a desire to adjust the computer
to provide more conservative calculations, use
the personal adjustment feature to affect decom-
pression calculations or reduce the PO
2
setting
to affect oxygen exposure according to the en-
tered O
2
% and PO
2
values. Calculations based
DIVE TIME
T
C
B
m
CEILING
ASC TIME
AIR
TIME
bar
Fig. 3.17. Decompression
dive, above fl oor. Upward
pointing arrow has disap-
peared and ASC TIME label
has stopped blinking, which
means that you are in the
decompression range.
Fig. 3.18. Decompression
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 acti-
vates alternative display.
DIVE TIME
T
C
B
m
STOP
CEILING
ASC TIME
MAX
TIME
AIR
TIME
bar
°
C
DIVE TIME
T
C
B
m
CEILING
ASC TIME
AIR
TIME
bar
AIR
TIME
AIR
TIME
AIR
TIME
AIR
TIME
Fig. 3.16. Decompression dive,
below fl oor. Upward pointing
arrow, blinking ASC TIME label
and an audible alarm tell you to
ascend. Minimum total ascent
time including safety stop is 7
minutes. Ceiling is at 3 m [10 ft].