Bar Graphs; Asc Bar Graph; N2 Bar Graph; Algorithm - Aqua Lung i750TC Owner's Manual

BAR GRAPHS

The i750TC features two specific bar graphs.
1. The one on the left represents ascent rate. It is referred to as ASC Bar Graph.
2. The one on the right represents nitrogen loading. It is referred to as the N2 Bar Graph.
Ascent Rate

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
0 0 - 1 (0 - 0.3)
1 >1 - 5 (0.3 – 1.5)
2 >5 - 10 (>1.5 - 3.0)
3 >10 - 15 (>3.0 - 4.6)
4 >15 - 20 (>4.6 - 6.1)
5 >20 - 25 (>6.1 - 7.6)
6 >25 - 30 (>7.6 - 9.1)
7 >30 (>9.1)

N2 BAR GRAPH

The N2 Bar Graph represents your relative No Decompression or Decompression status. As your depth and
elapsed dive time increase, the bar graph will grow in length, shift from green to amber, and ultimately to red (in-
dicating a Decompression condition). As you ascend the bar graph recedes, indicating that additional No Decom-
pression time is available. The i750TC monitors multiple theoretical nitrogen compartments simultaneously. The
N2 Bar Graph displays the one that is in control of your dive at any given time.

ALGORITHM

The i750TC utilizes the Z+ 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 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 ON, it will trigger after descending deeper than 24 m (80 ft. The i750TC then calcu-
lates (continually updating) a Stop Depth equal to ½ the Max Depth.
NOTE: The Deep Stop feature only works in DIVE mode while within No Decompression times.
© Aqua Lung International, Inc. (2016)
Nitrogen Loading
ASCENT RATE,
FPM (MPM)
ASC ALARM TRIGGERED
flashing
20
DIVE FEATURES
Doc. 12-7852-r05 (8/5/16)