SUUNTO VYTEC DS - Manual (Page 27)

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shown in the left center window of the display. The calculation is always
based on the actual pressure drop in your cylinder and will automatically
adapt to your cylinder size and current air consumption.
The change in your air consumption will be based on constant one
second interval pressure measurements over 30 - 60 second pe riods.
An increase in air consumption will infl uence the remaining air time rap-
idly, while a drop in air consumption will increase the air time slowly. Thus
a too optimistic air time estimation, caused by a temporary drop in air
consumption, is avoided.
The remaining air time calculation includes a 35 bar [500 psi] safety
reserve. This means that when the instrument shows the air time to be
zero, there is still about 35 bar [500 psi] pressure left in your cylinder
depending on your air consumption rate. With a high consumption rate
the limit will be close to 50 bar [725 psi] and with a low rate close to 35
bar [500 psi].
NOTE! Filling your BC will affect the air time calculation, due to the tem-
porary increase in air consumption.
NOTE! A change of temperature will affect the cylinder pressure and
consequently the air time calculation.
Low Air Pressure Warnings
The dive computer will warn you with three audible double beeps and a
blinking pressure display when the cylinder pressure reaches 50 bar [725
psi] (Fig. 3.12.). Three double beeps are also heard when the cylinder
pressure goes down to the user selected alarm pressure and when the
remaining air time reaches zero.
3.3.4. Consumed Bottom Time (CBT)
The available no-decompression stop time is also shown visually in the
multi-function bar graph on the left side of the display (Fig. 3.7., 3.8. and
3.9.). When your available no-decompression time decreases below 200
minutes, the fi rst (lowest) bar graph segment appears. As your body
absorbs more nitrogen, more segments start to appear.
White Zone - As a safety precaution Suunto recommends you should
maintain the no-decompression bar graph within the white zone. Seg-
ments start to appear when the available no-decompression time de-
creases below 100, 80, 60, 50, 40, 30 and 20 minutes.
Gray Zone- As the bars reach the gray zone, your no-decompression
stop time is less than 10 or 5 minutes and you are getting very close
to no-decompression limits. At this point, you should start your ascent
towards the surface.