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CHROMIS USER MANUAL
the surface, Chromis emits a sequence of
audible bips and the DECO STOP symbol
blinks, both for 12 seconds.
Alarms can not be turned off because
they represent situations that do require
immediate action by the diver. There are
fi ve different alarms:
WARNING
- When in gauge mode, all warnings and all alarms
are OFF except for the low battery alarm.
- When Chromis is set to SOUND OFF mode, all
audible alarms and warnings are switched off.
4.7.6.4 Ascent rate
As you ascend during a dive, the pressure
surrounding you diminishes. If you ascend
too quickly, the resulting pressure reduction
could lead to microbubble formation. If you
ascend too slowly, the continued exposure
to high ambient pressure means that you
will continue loading some or all of your
tissues with nitrogen. Consequently, there
is an ideal ascent rate that is slow enough
to minimize microbubble formation yet fast
enough to minimize the effect of continued
loading on your tissues.
The pressure reduction that the body can
tolerate without signifi cant microbubble
formation is higher at depth than it is in the
shallow water: The key factor is not the
pressure drop by itself, but rather the ratio
of the pressure drop relative to the ambient
pressure. This means that the ideal ascent
rate at depth is higher than it is in the
shallow water.
Along these lines, Chromis 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
00723
620826
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 blinking.
Chromis 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.
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