Operations Manual Perdix
Manual DocRev B
37
Decreasing NDL
As we descend deeper, the NDL decreases.
The TTS shows it will take 5 minutes to ascend to the
surface at 10m/min (33ft/min).
Bottom Time
We have completed the bottom time.
The TTS indicates we have about 1.5 hours or
decompression to do.
The first stop will be at 48m for 1 minute.
Ascending to First Stop
Here we are ascending at 3m/min (each bar beside
the depth is 3m/min). This is slower than the expected
10m/min ascent rate.
This slow ascent has caused the TTS to rise, as most
tissues are still on-gassing.
First Deco Stop
The slow ascent has caused the first stop to clear
before we reached it. This often happens with slow
ascents.
Note that the GF99 value now indicates that the
leading tissues are now off-gassing. However, at this
deep depth most tissue compartments are still on-
gassing.
A problem has developed
There is a problem with the O2 readings on the
rebreather controller and the decision has been made
to bail out
After physically switching the BOV or mouthpiece, the
computer needs to be set to BO mode for proper deco
calculations.
TIME
TTS
CC 10/50
4
O2/HE
NDL
DEPTH
TIME STOP
48.4
1.3
3
5
Gas
TIME
TTS
CC 10/50
O2/HE
GF99
DEPTH
TIME STOP
90.2
1.3
20
92
48 1
On
TIME
TTS
O2/HE
GF99
DEPTH
TIME STOP
61.6
1.3
29
96
48 1
CC 10/50 6%
CC 10/50 20% 98
TIME
TTS
O2/HE
GF99
DEPTH
TIME STOP
45.3
1.3
34 45 1
Switch CC -> BO
TIME
DEPTH
TIME STOP
30.4
1.3
42 30 2
