38
CHROMIS USER MANUAL
In case of a fast ascent, Chromis 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 fatal issue.
The alarm persists for as long as the ascent
rate is 110% or more of the ideal ascent rate.
4.7.6.5 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 fatal issue.
If you exceed the MOD, in the top row the
blinking MOD is displayed with MAX symbol
so you can see by how much you have
exceeded it. In addition, Chromis will beep
continuously. Both the blinking of the MOD
value and the beeping will continue for as
long as you stay deeper than the MOD.
4.7.6.6 CNS O
2
= 100%
WARNING
When the CNS O
2
reaches 100% there is
danger of oxygen toxicity. Start procedure to
terminate the dive.
Chromis tracks your oxygen uptake via the
CNS O
2
clock. If the calculated value of
CNS O
2
reaches 100%, Chromis will emit a
sequence of audible beeps for 12 seconds
and the symbol O
2
% MAX will be blinking
in the top right corner. The blinking will
continue until the value of CNS O
2
drops
under 100%.
The audible signal stays on for as long as
the CNS O
2
value equals or exceeds 100%;
until the diver will reach the surface.
4.7.6.7 Missed decompression stop
WARNING
Violating a mandatory decompression obligation
may result in serious injury or fatal issue.
If in presence of a required decompression
stop you ascend more than 0.5m/2ft above
the required stop, Chromis will trigger an
alarm: the value of the current depth and the
value of the required stop depth will blink,
and a sequence of beeps can be heard. This
will continue for as long as you stay 0.5m/2ft
or more above the required stop.
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