How-To Guide
dive.
Otherwise,
it will turn on
aut
omatic
all
y
within 20
seconds
of having
reached
a depth of
1.2m/4ft.
With CXR-I you have a choice of how
the
information
is
presented
on the
display
.
The
standard
display
presents
dive inf
ormation
in a
pr
e
v
alentl
y
numerical format.
Mor
e
specifically,
the following
information
is
displayed
(Fig. 16):
9.1.
DETAILED DESCRIPTION
OF
DISPLAYED
DATA
The depth is given in 10cm
resolution until
99.9meters,
after which it is given in
1m
resolution.
When the depth is
displayed in
feet, the
resolution
is always 1 foot. At a
depth
shallower
than 1.2m/4ft, the display shows
---.
Maximum
possible
depth is
150m/492ft.
The dive time is
displayed
in
minutes.
If
during
the dive you
ascend
to the
surface,
the
time
spent
on the
surface
will only be
count
ed
if you
descend
again below 1.2m/4ft
within
3
minutes.
This allows for brief
periods of
orientation.
While on the
surface,
the time will
not show as
progressing
but it is
running in
the
background.
As soon as you
submerge, the
time will
resume,
including the time
spent on
the
surf
ac
e.
The no deco time is
calculated
in
real
time
and
updated
continuousl
y
.
Maximum
display
ed
no deco time is 99
minutes.
If you
remain
at
depth beyond a no deco time of zero
minut
es,
you will
enter
into
decompression:
you can
no
longer
make a direct
ascent
to the
surface and
CXR-I
displays
a
MANDATORY
decompr
es
sion
stop. Instead
of a no deco time, it shows
y
ou
the depth of the
deepest stop,
the time at
the
deepest stop,
and the total
ascent
time (ASC),
which
includes
each
decompression stop and
the time
required
to travel the vertical
dis
t
anc
e
to the
surface
at the allowed
rate
(Fig. 17). ASC
does
NOT
include the
duration
of deep
s
t
ops.
Deep
stops
are
NOT
mandatory
so you
c
an
skip
them without
incurring
any penalty in
the
decompression
c
al
culation.
Once
there
is a
mandatory
decompr
es
sion
stop,
the
second
button from the left
f
eatur
es
a
new label: .
Pressing
and holding it will
display the
details
of all
stops computed
by
CXR-I, up to a
maximum
of 4,
starting
from
the
deepest
(Fig. 18).
The tank
pressure
is
based
on the signal
from
the tank
module.
The tank
module
has a
r
ange
of 1.5m/5ft. In addition to showing the
numeric
value, CXR-I
employs
color coding to
identify
a
range
in tank
pressure,
as
described in
section 2.3.1
tissue compartment.
The bar
graph
is
made
of ten
segments,
which
gr
aduall
y
switch
from
green
to
red
during the dive. The more
r
ed
segments
you see, the
closer
to the no
dec
o
limits you are. As you
enter
a
situation of
mandatory decompression stop,
all
segments
will be
r
ed.
During a
surface interval,
the
segments
will
gr
aduall
y
turn off as CXR-I
tracks the
offgassing
of your
tis
sues.
Ascent rate: in
presence
of a depth
change
in
e
x
c
es
s
of 80cm
/
3ft, CXR-I
calculates the
corresponding ascent speed
and
displays both
numericall
y
(in lieu of the dive time) and via
an
arrow bar which, for the
duration
of the
asc
ent,
replaces
the
nitrogen
bar
graph.
Each arrow
in
the arrow bar
represents
20% of the
all
o
w
ed
rate.
These
arrows
turn
red
for
speeds in
e
x
c
es
s
of the allowed limit
described
in
section
8.5.1.
The current gradient factor
(GF NOW)
is
the
highest
value of inert gas
super
satur
ation
among all 16
tissues
of the
algorithm
at
the
present moment.
The gradient factor at
the
surface
if the diver
ascends
now
(GF @
SURF)
is the value of
supersaturation
that at
l
east
one
tissue
will
reach
if you were to
ascend
no
w
at the allowed
ascent rate disregarding any
deco and safety
stop
(Fig. 19).
The ceiling is the depth at which you w
ould
exceed
the
gradient
factor. As you
clear
a
s
t
op
and begin the next one, the ceiling is the
same
as or very close to the
stop
depth itself. As
the
duration
of the
stop decreases,
so does
the
ceiling until it
reaches
the depth of the
ne
xt
s
t
op.
The
stopwatch
can be
reset
by
pressing and
holding when the
stopwatch
is
display
ed.
This
will also set a
bookmark
in the dive
pr
ofil
e
memory.
-
-
current
depth and
temperature
in top
r
o
w
no
deco time in middle
row
(depth of
deepest stop,
time at
deepest stop
and
t
ot
al
ascent
time in
case
of
decompression
div
es)
dive time and active
gradient
f
act
or
s
in
bottom
r
o
w
description
of gas in use, tank
pressure in
bar
/
psi,
graphic representation
of
t
ank
pressure
using the 4 color
ranges described
in
section
2.3.1, time to
reserve
(
TTR
)
or
remaining
gas time
(
RGT
)
along the
right
edge of the
display
nitrogen
bar
graph
along the left edge of
the
display
ascent speed:
in
case
of an
ascent,
the
v
alue
in
m/min
or ft/min is
displayed
in lieu of
the
dive time, while
gr
aphic
all
y
it is shown
in
lieu of the
nitrogen
bar
graph
(each
arr
o
w
representing
20% of the allowed
limit).
-
-
-
-
Upon
pressing
, the field to the right of
the
current
depth is modified in the
f
ollowing
sequenc
e:
-
max
depth
-
-
-
-
-
average depth
MOD
of gas in
use
deep
stop
if active and
c
alculated
ASC
+
X
ceiling.
(TO
BE
INTRODUCED
VIA
FREE
FIRMWARE UPGRADE
SOON)
Upon
pressing
, the field to the right of
the dive time is modified in the
f
ollowing
sequenc
e:
9.2.
DEEP, DECO AND
SAFETY
STOPS
DEEP
stops
are
generated
as you
approach
the
no deco limit.
DEEP
stops
are
NOT
mandat
ory
but
rather suggestions
which
attempt
t
o
minimize bubble
production
by
offgassing
some nitrogen
at high
ambient pressure. Deep
stops
are shown to the right of the
current
depth (Fig. 20).
DECO
stops
are
generated pr
ogr
es
siv
el
y
as
y
ou
stay
at depth beyond the no deco
time.
DECO
stops
are
MANDATORY
As you
appr
oach
the depth of a
stop,
the
duration
of the
s
t
op
is
gr
aduall
y
reduced.
The
duration
itself
is
always shown in
minutes,
and is
calculated
as
a
function of the
pressure gradient
achie
v
ed
at
the
stop
depth itself. Hence the
f
arther
you
are
from the exact depth of the
stop,
the
longer it
will take for each
minute
to tick
off
.
A
SAFETY
stop
is
generated
as soon as
the
depth of the dive
exceeds
10m
/
33ft. It
has
a
duration
of 3
minutes
and it is
c
arried
out
between depths
of 6m
/
20ft and 3m
/
10ft at the end of a dive prior to
surf
acing.
Such
stop
is
NOT
mandatory
but
HIGHL
Y
RECOMMENDED
. A
safety
stop
is
al
ways
shown as a
3-minute countdown
in
minut
es
and
seconds
(Fig. 21).
-
current gradient factor/gradient
factor
at
the
surface
if the diver
ascends
no
w
s
t
opwatch
CNS (Nitrox
onl
y)
ppO (Nitrox
onl
y)
-
-
-
-
-
-
-
2
time of
day
battery status
of
CXR-I
battery status
of tank
module
in
use
gas
consumption
in l/min or
cuft/min.
2
2
The
battery
in the tank
module
is shown
as
a
battery
outline with
either
3
(battery
ok),
2
(battery
ok for now but you
should
c
onsider
replacing
it) or 1
(battery
could fail any
time)
segments
inside of it. The
3-segment situation
is
green,
the
2-segment situation
is
y
ell
o
w,
and the
1-segment situation
is
r
ed.
The nitrogen bar graph is on the
l
eft
side of the display. It
represents
nitr
ogen
supersaturation
(any
amount
in
e
x
c
es
s
of
the
equilibrium state
at the
surface)
in the
l
eading
13
NOTE
CXR-I
needs
appr
o
ximat
el
y
2
minutes
t
o
analyze your
breathing pattern,
thus
the
TTR
or
RGT
is not
displayed
at the
v
ery
beginning
of the
div
e.
NOTE
if you set CXR-I to
AIR,
the
information on
MOD,
CNS and ppO are not
displayed in
order
to simplify the display. The CNS
v
alue
is however
calculated
in the
back
gr
ound
and both the CNS
alarm
and
MOD
alarm
are
triggered
if the
circumstances
r
equir
e
it. If you are diving air but would anyway
like to see the
MOD,
CNS and ppO ,
set
CXR-I to Nitrox 21%.
W
ARNING
-
If CXR-I
receives
no signal
from
the tank
module
for 45
seconds, the
pressure
value is
replaced
by ---.
Check
the position of CXR-I with
respect
to
the
tank
module. Start ascending
if you
don’t
get a tank
pressure reading unless
y
ou
have a
spare pressure gauge.
-
If the tank
pressure
r
eaches
10bar/145psi,
the tank
module will
turn
off and CXR-I will not show
t
ank
pressure
any
l
onger
.