Decompression; Gas Switches; Overview - Aqua Lung i300C Owner's Manual

• Historically, many accidents and near misses have occurred by switching to the wrong gas at the
wrong depth. DO NOT attempt gas switch decompression dives without proper education and
training to do so from an internationally recognized training agency.
• Diving deeper than 39 m (130 ft), will greatly increase your risk of decompression sickness.
• Decompression diving is inherently hazardous and greatly increases your risk of decompression
sickness, even when performed according to the dive computer's calculations.
• Using an i300C is no guarantee of avoiding decompression sickness.
• The i300C enters Violation Mode when a situation exceeds its capacity to predict an ascent
procedure. These dives represent gross excursions into decompression that are beyond the
boundaries and spirit of the i300C's design. If you are following these dive profiles, Aqua Lung
advises that you should not use an i300C.
• If you exceed certain limits, the i300C will not be able to help you get safely back to the surface.
These situations exceed tested limits and can result in loss of some functions for 24 hours after the
dive in which a violation occurred.

OVERVIEW

• All dives begin with GAS 1.
• The GAS defaults to # 1 after 10 minutes on the surface.
• Gas switches can only be made when a Dive Main screen is displayed and gases 2/3 are set on.
• Gases cannot be switched while on the surface.
• The Gas Menu cannot be accessed during the sounding of alarms.
• If an alarm strikes while in the Gas Menu, the switch operation is terminated, reverting to the Dive Main screen.
GAS MENU LEAD-IN
next item in
Dive Main
Menu
If the current PO2 value is greater than 1.6, then a "HI PO2" warning not to switch will display. The i300C will
maintain the current gas without switching. The diver may overide the i300C and force the gas switch by holding
the SEL button during the "HI PO2" message.
WARNING: Switching to gases with a PO2 above 1.6 has a high risk of oxygen poisoning, convulsions,
!
and drowning. Doing so should always be avoided. It is intended as a last resort option because of the
likelihood of injury or drowning. Always dive within your training, experience, and skill level.
© Aqua Lung International, Inc. (2017)

GAS SWITCHES

WARNINGS:
!
current PO value
2
access
Set Gas
Menu
GAS MENU
to next gas
or return to
Gas Menu
Lead-in
36
DIVE OPERATION
FO setting
2
to confirm
gas switch
Doc. 12-7874-r06 (11/27/17)