20
ALADIN H USER MANUAL
3.4.9
Ascent rate
Too fast
ascent
indicator
Ascent rate
Optimal ascent rate varies depending on depth
between 7 and 20m/min (23 and 67ft/min). It
is displayed as a percent of the reference
variable ascent rate. If the ascent rate is greater
than 100% of the set value, the vertical black
arrow with “SLOW” appears. If the ascent rate
exceeds 140%, the arrow starts flashing.
The Aladin H provides an audible alarm
if the ascent rate is 110% or greater. The
intensity of the alarm increases in direct
proportion to the degree that the prescribed
ascent rate is exceeded.
WARNING
The prescribed ascent rate must be observed
at all times! Exceeding the prescribed ascent
rate can lead to microbubbles in the arterial
circulation which can lead to serious injury or
death due to decompression sickness.
• In case of an improper ascent the Aladin
H may require a decompression stop,
even within the no-stop phase, because
of the danger of microbubble formation.
• The decompression duration necessary
for the prevention of microbubbles can
increase massively if the ascent rate is
exceeded.
• From great depths a slow ascent may
cause heightened saturation of tissues
and an extension of both decompression
duration and total ascent time. At shallow
depths, a slow ascent may shorten the
decompression duration.
• Display of the ascent rate has the
priority over “CNS O
2
”.
Excessive ascent rates for longer periods
are entered in the logbook. The following
ascent rates correspond to the 100% value
in the Aladin H.
DEPTH
ASC SPEED
m
ft
m/min
ft/min
0
0
7
23
6
20
8
26
12
40
9
29
18
60
10
33
23
75
11
36
27
88
13
43
31
101
15
49
35
115
17
56
39
128
18
59
44
144
19
62
50
164
20
66
3.4.10 Partial pressure of oxygen
(ppO
2
max)/Maximum
operating depth (MOD)
The maximum partial pressure of oxygen
(ppO
2
max), with a default of 1.4bar,
determines the Maximum Operating Depth
(MOD). Diving deeper than the MOD
exposes you to oxygen partial pressures
higher than the set maximum level.
The ppO
2
max, and consequently the MOD, can
be reduced manually when setting the gas. See
chapter:
Settings
, section: Gas menu.
WARNING
The MOD is a function of ppO
2
max and the mixture
used. If during the dive the MOD is reached or
exceeded, the Aladin H sends an audible attention
message and the MOD is displayed (flashing) in
the lower left corner. If this occurs, ascend to a
depth shallower than the displayed MOD in order
to diminish the danger of oxygen poisoning.
Summary of Contents for Aladin H
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