Altitude Sensing And Adjustment - Aqua Lung i450T Owner's Manual

Testing
• Activate the unit and ensure that the LCD is clear and sharp in contrast. If any portions are missing or appear
dim, or if a low battery condition is indicated, return the i450T to an authorized Aqua Lung dealer for evaluation
before use.
• During 24 hours after completion of a dive, the graphics SEL and DATA with selections SAVE ? and CLEAR ?
will be displayed giving you the option to retain or delete Ni-O2 calculations for repetitive dives.
to move
(■) up
to move
(■) down
• Graphics DATA SAVED (or CLEARED) with CAL COMPASS appear for 3 seconds, then operation reverts to the
Compass CAL screen.
• Calibrate the compass.
• Verify all set points prior to diving.

ALTITUDE SENSING AND ADJUSTMENT

Prior to the first dive of a series of repetitive dives, Altitude (i.e., ambient pressure) is measured upon activation of
Dive Surface Mode and every 15 minutes until a dive is made or operation reverts to Watch Mode.
• While it is operating in Watch Mode after a dive, measurements are taken every 15 minutes during the 24 hour
period after surfacing.
• Measurements are only taken when the unit is dry.
• Two readings are taken, the second reading 5 seconds after the first. The readings must be within 1 foot (30 cm)
of each other to record that ambient pressure as the current altitude.
• No adjustments are made during any time that the wet contacts are bridged.
When diving in high altitude waters from 3,001 to 14,000 feet (916 to 4,270 meters), the i450T automatically ad-
justs to these conditions providing corrected depth, and reduced No Deco and O2 Times at intervals of 1,000 feet
(305 meters).
At an elevation of 3,001 feet (916 meters), Depth calibration automatically changes from feet of seawater to feet
of fresh water. This is the first adjustment to the algorithm. When the Conservative Factor feature is set to ON,
No Deco Times are calculated based upon the next higher 3,000 foot (915 meter) Altitude. All adjustments for
altitudes greater than 11,000 feet (3,355 meters) are then made to allowable dive times for 14,000 feet (4,270
meters). At Sea Level, calculations are based upon an altitude of 6,000 feet.
The i450T will not function as a dive computer above 14,000 feet (4,270 meters).
© Aqua Lung International, Inc. (2015)
to select
option
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REFERENCE MODE
Doc. 12-7834-r04 (2/16/16)