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DECOMPRESSION DIVE, ABOVE CEILING.
NOTE DOWNWARD POINTING ARROW, ER WARNING
AND ALARM. YOU SHOULD IMMEDIATLY (WITHIN
3 MINUTES) DESCEND TO OR BELOW CEILING.
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 will go 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 Section 5.7. Error conditions).
6.2. Diving in MIXED GAS mode
MIXED GAS mode is the first dive mode available in Suunto HelO
2
. The mode is used
when diving with air or with oxygen- or helium-enriched gas mixes.
6.2.1. Before diving in MIXED GAS mode
If set to the MIXED GAS mode, the correct oxygen and helium percentage of the gas in
your cylinders must always be entered into the computer to ensure correct inert gas and
oxygen calculations. The dive computer adjusts its mathematical inert gas and oxygen
calculation models accordingly. The dive computer will not accept fractional percentage
values of oxygen and helium concentration. Do not round up fractional percentages. For
example, 31.8% oxygen should be entered as 31%. Rounding up will cause inert gas
percentages to be understated and will affect decompression calculations. If you want to
adjust the computerto provide more conservative calculations,use the personal adjustment
feature to affect decompression calculations, or reduce the PO
2
setting to affect oxygen
exposure according to theentered O
2
% and PO
2
values. Calculations based onnitrox use
result in longer no-decompression times and shallower maximum depths than diving with
air.
As a safety precaution, the oxygen calculations in the computer are made with an oxygen
percentage of 1% + set O
2
% .
When the dive computer is set in MIXED GAS mode, the Dive Planning mode calculates
using the O
2
% and PO
2
values that are currently in the computer.
To set the nitrox, trimix and/or or heliox mixes, refer to Section 5.9.1. Setting the gases.
Default gas mix settings
In MIXED GAS mode, the Suunto HelO
2
allows you to set 1 – 8 gas mixes containing 8 –
99% oxygen and 0 – 92% helium.
In the MIXEDGAS mode, the default settingis standard air (21% O
2
and 0% He). Itremains
in this setting until the O
2
% is adjusted to any other percentage of oxygen (8% – 99%).
The default setting for maximum oxygen partial pressure is 1.4 bar, however you are able
to set it in the range of 0.5 - 1.6 bar.
6.2.2. Oxygen and helium displays
When MIXED GAS mode is activated, the display will show the information in the figure
below. In MIXED GAS mode, the maximum operational depth is calculated based on set
O
2
%, He% and PO
2
values.
31