Shearwater Petrel
Revision 1.1.0
27
Shearwater Research Inc.
But the diver missed the stop, and has ascended to 95 feet� At this
point, the stop depth and time is flashing
red
to show that the depth
is above the recommended stop�
The diver switches to the other programmed CC gas� Note that if
you change the diluent on the computer you must flush the loop
to change the diluent in the loop� At the same time the 100 foot
stop clears. It is common for the first stops to clear in less than a
minute� They mainly just slow down the ascent�
At 60 feet a problem develops that causes the diver to bail out to
open circuit. The first push on MENU brings up Select Gas.
The second push brings up Switch CC > OC� A push on SELECT
does the switch�
Note that OC displays in
Yellow
to clearly indicate that this is a OC
bailout condition�
The system has switched the gas set from the closed circuit gas set
to the open circuit gas set, picked the gas with the highest PPO2
less than 1�6, and recalculated the decompression based on the
new profile.
At 20 feet, one push on MENU brings up select gas�
A push on SELECT enters the select gas menu, and another
SELECT picks the O2� Since the gases are sorted by oxygen
content, the O2 is the first gas offered.
This was a multi-gas trimix dive with a multi-gas open circuit bailout,
and it required 9 button pushes�
DEPTH TIME STOP TIME
95 15
1OO
1
CC 1O/5O O 22
1.3O 1.29 1.29
O2/HE NDL TTS
DEPTH TIME STOP TIME
95 15 9O 1
CC 21/5O O 22
1.3O 1.3O 1.29
O2/HE NDL TTS
DEPTH TIME STOP TIME
6O 19 6O 1
Select Gas
1.3O
.99
1.29
DEPTH TIME STOP TIME
Switch CC > OC
1.3O
1.OO
1.29
DEPTH TIME STOP TIME
6O 19 6O 1
OC
5O/2O O 36
1.3O
1.O9
1.29
O2/HE NDL TTS
DEPTH TIME STOP TIME
2O 25 2O 3
Select Gas
.87
.95
.79
O2/HE NDL TTS
DEPTH TIME STOP TIME
Cancel
Select
2O 25 2O 3
Set 1 OC 99/OO
.87
.95
.79
6O 19 6O 1
Summary of Contents for Petrel EXT
Page 1: ...Standalone EXT Models...