Aqua Lung i450T, Owner'S Manual

Page: 21 / 86

Doc. 12-7834-r04 (2/16/16)
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DIVE FEATURES
© Aqua Lung International, Inc. (2015)
ASC BAR GRAPH
The ASC Bar Graph provides a visual representation of ascent speed (i.e., an ascent speedometer). When the
ascent is faster than the recommended 30 fpm (9 mpm), all segments flash until the ascent is slowed.
# OF SEGMENTS ASCENT RATE,
FPM (MPM)
0 0 - 10 (0 - 3)
1 11 - 15 (3.1 - 4.5)
2 16 - 20 (4.6 - 6)
3 21 - 25 (6.1 - 7.5)
4 26 - 30 (7.6 - 9)
5 > 30 (> 9)
N2 BAR GRAPH
The N2 Bar Graph represents your relative No Decompression or Decompression status. The first four seg -
ments represent No Decompression status and the fifth indicates a Decompression condition. As your Depth and
Elapsed Dive Time increase segments are added. As you ascend segments recede, indicating that additional No
Decompression time is available. The i450T monitors twelve different nitrogen compartments simultaneously and
the N2 Bar Graph displays the one that is in control of your dive at any given time.
ALGORITHM
The i450T utilizes the PZ+ algorithm to calculate nitrogen tissue loading. Performance is based on Bühlmann
ZHL-16C algorithm model. To create even greater margins of safety with respect to decompression, a Conserva-
tive Factor as well as No Decompression Deep and Safety Stops can be included for No Decompression dives.
CONSERVATIVE FACTOR
When the CF is set On, the dive time remaining, No Decompression/O2 MIN, which are based on the algorithm
and used for N2/O2 calculations and displays relating to Plan Mode, will be reduced to the values available at the
altitude level that is 3,000 ft (915 m) higher than the actual altitude at activation. Refer to the charts in the back of
this manual for dive times.
DS (DEEP STOP)
When the DS selection is set ON, it will trigger after descending deeper than 80 ft (24 m). The i450T then calcu-
lates (continually updating) a Stop Depth equal to ½ the Max Depth.
NOTE: The DS feature only works in DIVE Mode while within No Decompression times.
• While 10 ft (3 m) deeper than the calculated DS, you will be able to access a DS Preview screen that will display
the current calculated Deep Stop Depth/Time.
• Upon initial ascent to within 10 ft (3 m) below the calculated Stop Depth, a DS screen displaying a Stop Depth at
½
the Max Depth will appear with a countdown timer beginning at 2 min and counting down to 0. If you descend
10 ft (3 m) below, or ascend 10 ft (3 m) above, the calculated Stop Depth for 10 seconds during the countdown,
the No Decompression Main will replace the DS Main display and the DS feature will be disabled for the remain-
der of that dive. There is no Penalty if the DS is ignored.
• In the event that you enter Decompression, exceed 190 ft (57 m), or a High O2 SAT (Oxygen Saturation) condi-
tion, ≥ 80%, occurs, the DS will be disabled for the remainder of that dive.
• The DS is disabled during a High PO
2
Alarm condition, ≥ set point.
ASC ALARM TRIGGERED
flashing