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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 9 mpm (30 fpm), all segments will flash and the air pressure will temporar-
ily be replaced with the message SLOW.
# OF SEGMENTS
0
0 - 3 (0 - 10)
1
3.1 - 4.5 (11 - 15)
2
4.6 - 6 (16 - 20)
3
6.1 - 7.5 (21 - 25)
4
7.6 - 9 (26 - 30)
5
> 9 (> 30)
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
Deco (decompression) time is available. The i550C monitors twelve different nitrogen compartments simultane-
ously and the N2 Bar Graph displays the one that is in control of your dive at any given time.
ALGORITHM
The i550C utilizes the Z+ to calculate nitrogen tissue loading. Performance is based on Bühlmann ZHL-16C algo-
rithm model. To create even greater margins of safety with respect to decompression, a Conservative Factor as
well as No Decompression Deep and Safety Stops can be included for No Decompression dives.
CF (CONSERVATIVE FACTOR)
When the CF is set to On, the dive time remaining, No Deco/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 915 m (3,000 ft) 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 to ON, it will trigger after descending deeper than 24 m (80 ft). The i550C then cal-
culates (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 3 m (10 ft) deeper than the calculated DS, you will be able to access a DS Preview screen that will dis-
play the current calculated Deep Stop Depth/Time.
> Upon initial ascent to within 3 m (10 ft) 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 3 m (10 ft) below, or ascend 3 m (10 ft) 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 remainder of that dive. There is no Penalty if the DS is ignored.
> In the event that you enter Decompression, exceed 57 m (190 ft), 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
© Aqua Lung International, Inc. (2018)
ASCENT RATE,
MPM (FPM)
Alarm condition, ≥ set point.
2
ASC ALARM TRIGGERED
flashing
14
DIVE FEATURES
Doc. 12-7909-r04 (10/31/18)
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