Operations Manual Perdix
Manual DocRev B
34
SURFACE
TTS
OC 21/00 0 0
O2/HE
NDL
.21
GasPO2
0
DEPTH
TIME
10
h
58
m
TIME
TTS
OC 21/00 99 1
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
30
.4
1
TIME
TTS
OC 21/00 12
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
110
.9
3
3
TIME
TTS
OC 21/00
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
120
.97
8
7
0
20 1
TIME
TTS
OC 21/00
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
21
.34
11
2
0
20 1
TIME
TTS
OC 21/00
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
19
.33
12
2
0
20 1
TIME
TTS
OC 21/00
O2/HE
NDL
GasPO2
DEPTH
TIME STOP
9
.27
15
0
99
SIMPLE EXAMPLE DIVE
Watch the video:
Air - Dive
Here is an example
of a simple OC air
dive. It will help
to introduce the
screen displays as
the diver progresses,
the dive starts, the
depth increases. The
display is showing
the computer
programmed for open
circuit (OC) air.
As we pass through
30 feet, the time-
to-surface (TTS)
shows one minute.
This shows that
the computer is
expecting the
diver to ascend at
approximately 33
feet per minute or 10
meters per minute.
The dive predictions
are based on this
ascent rate.
The no-decompression
limit (NDL) starts
off showing 99, but
then starts to show
a smaller number as
the depth increases.
The 3rd screen shows
that we will go into
deco in 12 minutes.
We have now entered
decompression. Our
first stop, or ceiling, is
at 20 feet and we will
need to remain there
for up to one minute.
Although stops are
shown in minutes,
the computer will
calculate and change
the ceiling in real time
and the stop may be
less than a minute.
As we ascend, the
ascent rate indicator
shows about 20 fpm
or 6 mpm.
When we go shallower
than our first stop, the
stop depth starts to
flash
red
.
When we clear the last stop, the stop depth
and time goes blank, and now we see a
NDL of 99 minutes again. Once we surface,
the depth is 0 and a minute later when the
computer comes out of dive mode, the NDL
goes to 0 as well.
