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A300/A300 XT OPERATING MANUAL
© 2002 Design, 2012 Doc. No. 12-7255-r01 (5/14/12)
ALTITUDE SENSING AND ADJUSTMENT
Prior to the first dive of a series of repetitive dives, Altitude (i.e., ambient pressure) is measured upon activation, then every 15
minutes until a dive is made.
> 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 A300 AI automatically adjusts 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 On, NDLs are calculated based upon the next higher 3,000 foot (915 meter) Alti-
tude. 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 A300_A300 XT will not function above 14,000 feet (4,270 meters).
ANALOG PRESSURE GAUGE (A300 XT only)
The A300 XT integrated console is configured with an analog Pressure Gauge that displays tank pressures that range from 0 to
5,000 PSI (400 BAR) in increments of 250 PSI (10 BAR).
The console is uniquely integrated so that the Smartglo backlight that illuminates the A300 XT display screen will simultaneously
illuminate the screen of the pressure gauge when the S button is operated to activate the backlight.
When tank pressure decreases to 500 PSI (30 BAR), the audible will sound for 10 seconds as a warning during which the associ-
ated LED will flash.
During the sounding of the audible, the graphic Lo AIR will flash on the A300 XT dive main screen (Fig. 134).
WARNINGS:
Decompression diving, or diving deeper than 130 FT (39 M), will greatly increase your risk of decompression sickness.
Decompression diving is inherently hazardous and greatly increases your risk of decompression sickness, even when per-
formed according to the dive computer's calculations.
Using an A300 or A300 XT is no guarantee of avoiding decompression sickness.
Operation enters Violation Mode when a situation exceeds its capacity to predict an ascent procedure. These dives repre-
sent gross excursions into decompression that are beyond the boundaries and spirit of the unit's design. If you are follow-
ing these dive profiles, AERIS advises that you should not use an A300 or A300 XT.
If you exceed certain limits, the unit 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.
Fig. 134 - LOW PRESSURE
ALARM (A300 XT only)
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