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The ASC time is calculated based on the assumption that you start the ascent profile im-
mediately and all the PRIMARY gases are changed as soon as their maximum operating
depth allows it. That is, using the gases that are set as primary, the most optimal ascent
schedule for the moment is calculated.
To see the most pessimistic ascent schedule, that is, a schedule for the situation when
gases are not changed at all, you can set the gases as secondary and the time it takes to
finish the decompression using the current breathing gas is shown as the ASC time.
Showing the most pessimistic ascent schedule during a long dive can easily result in the
ascent time no longer fitting the reserved field and the dive computer displays "---" (max.
199 min).
NOTE
While setting the gases,notice that the calculated maximumoperating
depth is displayed in the upper field. You cannot change to this gas
before you have ascended above this depth.
The default oxygen percentage (O
2
%) setting is 21% (air) and oxygen partial pressure
(PO
2
) setting 1.4 bar.
5.9.2. Setting the depth alarm
You can set a depth alarm in the dive computer.
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
The depth alarm is factory-set to 50 m/160 ft, but you can adjust it according to your per-
sonal preference, or switch it off altogether. The depth range can be set from 3 m to 120
m/10 ft to 394 ft.
5.9.3. Setting the dive-time alarm
The Suunto HelO
2
has a dive-time alarm setting which, when activated, can be used for
several purposes to add to your diving safety.
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
NOTE
With a range of 1 - 999 minutes, the alarm can be set to your planned
bottom time, for example.
5.9.4. Setting the personal/altitude adjustments
The current Altitude and Personal Adjustment settings are displayed in the startup screen
when entering the DIVE mode. If the mode does not match the altitude or personal condi-
tions (see Section 5.10.4. Diving at altitude and Section 5.10.5. Personal adjustments), it
is imperative that you enter the correct selection before diving. Use Altitude Adjustment
to select the correct altitude and use Personal Adjustment to add an extra level of conser-
vatism or aggressiveness.
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