How-To Guide
CXR-I
Dive
Comput
er
•
PART I
•
1.
INTRODUCTION
1.1.
GL
OS
SARY
AGF:
Alternate gradient
f
act
or
AIR:
Air
div
e
Total
ascent
time, the time it
takes
to
perform
the
ascent
from your
current
depth to the
surface
in a
decompression dive,
including all
decompression stops
and
assuming
an
ascent rate
of
10m/min
or
33ft/min.
ASC:
ASC
+ X:
The overall
ascent
time inclusive of all
decompression stops
if the dive is
extended
by
X
minutes
at the
current depth.
AV
G
:
Average
depth
,
calculated
from the
beginning
of the
div
e.
CNS:
Central Nervous System.
CNS% is used to quantify toxic
effects
of
oxygen.
D-TIME:
Dive time, the whole time
spent
below a depth of
1.2m/4ft.
DESAT:
Desaturation
time. The time
needed
for the body to
eliminate
the
nitrogen taken
up during diving.
Gas
int
egr
ation:
The
f
eatur
e
in CXR-I to include tank
pressure
information
in its
calculations
and to display it on the
computer
scr
een.
Gas
switching:
The act of
changing
from one
breathing
gas to
another.
GF:
Gradient
f
act
or
Gradient
F
actor:
Percentage
of
Bühlmann’s
original value of
maximum
allowed
super
satur
ation
Helio
x:
A
breathing
gas
containing
Oxygen and
Helium.
Max
depth:
Maximum depth
attained
during the
div
e.
Maximum
Operating
Depth. This is the depth at which the
partial pressure
of oxygen (ppO
)
reaches
the
maximum
all
o
w
ed
2
level (ppO max). Diving
deeper
than the
MOD
will
expose
the diver to
unsafe
ppO
l
e
v
els.
MOD:
2
2
Multigas:
Refers
to a dive in which more than one
breathing
gas is used (air
and/or
Nitr
o
x).
Nitr
o
x:
A
breathing
mix
made
of oxygen and
nitrogen,
with the oxygen
concentration
being 22% or
higher
.
This is the time that you can
stay
at the
current
depth and
still
make a direct
ascent
to the
surface
without having to
perform
mandatory decompression
s
t
ops.
No deco
time:
NO-FLY:
Minimum
amount
of time the diver
should
wait
before
taking a
plane.
O
:
Oxygen.
2
O %:
Oxygen
concentration
used by the
computer
in all
c
al
culations.
2
P
airing:
The act of
establishing
a coded RF
communication between
CXR-I and a
dedicated
device, such as a tank
modul
e.
Partial pressure
of oxygen. This is the
pressure
of the oxygen in the
breathing
mix. It is a function of depth and
oxygen
concentration.
A
ppO
higher
than 1.6bar is
considered
danger
ous.
ppO
:
2
2
ppO
max:
The
maximum
allowed value for ppO .
T
ogether
with the oxygen
concentration
it
defines
the MOD.
2
2
Remaining
Gas Time, it is the time that a diver can
spend
at the
current
depth
before
having to
ascend
in
order
to
reach the
surface
with the tank
reserve still
av
ailabl
e.
RGT:
SURF INT:
Surface interval,
the time that has
elapsed
since the end of the
div
e.
Switch
depth:
The depth at which the diver
plans
to switch to a
higher
oxygen
concentration
mix while using the
multigas option.
T
rimix:
A
breathing
gas
containing
Oxygen,
Nitrogen
and
Helium.
TTR:
Time To
Reserve,
it is the time that a diver can
spend
at the
current
depth
before reaching
the tank
r
eserv
e.
4