Technical information

42
3. Meridian as a dive computer
SCUBAPRO MERIDIAN
3. Meridian as a dive computer
Along these lines, Meridian employs a
variable ideal ascent rate: its value ranges
between 7..20m/min / 23..66ft/min and the
actual breakdown by depth range is listed
in the chart below.
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
If the ascent rate is greater than 110% of
the ideal value the SLOW symbol appears.
For ascent rates higher than 140%, the
SLOW symbol starts to flash.
Slow symbol
Meridian also provides an audible alarm
in case of ascent rates exceeding 110%:
the intensity of the alarm increases in direct
proportion to the degree that the ideal
ascent rate is exceeded.
In case of a fast ascent, Meridian may
require a decompression stop even within
the no-stop phase because of the danger
of microbubble formation.
From great depth a slow ascent may
cause heightened saturation of tissues
and an extension of both decompression
duration and total ascent time. At shallow
depth, a slow ascent may shorten the
decompression duration.
Excessive ascent rates for longer periods
are entered in the logbook.
WARNING
The ideal ascent rate must not be exceeded at
any time since this could lead to microbubbles
in the arterial circulation which could cause
serious injury or death.
The alarm persists for as long as the ascent
rate is 110% or more of the ideal ascent
rate.
3.11.8 MOD/ppO
2
WARNING
• The MOD should not be exceeded.
Disregarding the alarm can lead to oxygen
poisoning.
• Exceeding a ppO
2
of 1.6bar can lead to
sudden convulsions resulting in serious
injury or death.
If you exceed the MOD, the depth will start
to flash and in the bottom row the MOD is
displayed so you can see by how much you
have exceeded it. In addition, Meridian will
beep incessantly. Both the flashing of the
depth value and the beeping will continue
for as long as you stay deeper than the
MOD.
3.11.9 CNS O
2
= 100%
WARNING
When the CNS O
2
reaches 100% there is
danger of oxygen toxicity. Start procedure to
terminate the dive.
Meridian tracks your oxygen uptake via the
CNS O
2
clock. If the calculated value of