SUUNTO Vyper - Manual (Page 29)

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3.3. DIVING WITH ENRICHED AIR NITROX
3.3.1. Before Diving
This dive computer can be used for diving with standard air only (AIR Mode) or
it can be set for diving with Enriched Air Nitrox (EANx) (NITROX Mode). If
you are educated for nitrox diving and you plan to make nitrox dives, it is recom-
mended that you set the dive computer permanently to its NITROX Mode (see
chapter 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 ensure correct nitrogen and
oxygen calculations. The dive computer adjusts its mathematical nitrogen and
oxygen calculation models according to the entered O
2
% and PO
2
values. Calcu-
lations based on enriched air result in longer no-decompression times, shallower
maximum depths and dive plan information with regard to oxygen exposure.
WARNING!
DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE
NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE
ANALYSIS VALUE INTO YOUR DIVE COMPUTER! Failure to verify
cylinder contents and enter the appropriate O
2
% into your dive computer will
result in incorrect dive planning information.
WARNING!
THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL PERCENT-
AGE VALUES OF OXYGEN CONCENTRATION. DO NOT ROUND UP
FRACTIONAL PERCENTAGES! For example, 31.8% oxygen should be
entered as 31%. Rounding up will cause nitrogen percentages to be understated
and will affect decompression calculations, which could result in dive planning
with an increased risk of decompression sickness. If there is a desire to adjust
the computer to provide more conservative calculations, use the personal ad-
justment feature to affect decompression calculations or reduce the PO
2
setting
to affect oxygen exposure tracking.