Shearwater Perdix 2, Руководство по эксплуатации, Страница: 20 / 82

Page 20
Doc. 13301-Tec-RevB (2022-05-25)
Technical Modes
Operating Instructions
Pressure
The pressure in millibars� Two values are shown,
the surface (surf) pressure and the current (now)
pressure�
Note that typical pressure at sea level is 1013 millibar,
although it may vary with the weather (barometric
pressure)� For example, surface pressure may be as
low as 980 millibar in a low pressure system, or as
high as 1040 millibar in a high pressure system�
For this reason, the PPO2 displayed on the surface
may not exactly match the FO2 (fraction of O2),
although the displayed PPO2 is still correct�
The surface pressure is set based on the lowest
pressure the dive computer sees in the 10 minutes
prior to the start of a dive� Therefore, altitude is
automatically accounted for and no special altitude
setting is required�
Date and Time
In a 12 or 24 hour format� Time format can be changed
in the watch settings menu�
Timer
A simple stopwatch� The timer is
only available as a customizable
display� It is not available in the info
row�
Gas Density Display
The Gas Density display is only
available as a customizable display
and is not available in the info row�
For open circuit diving, the gas
density display turns yellow at 6�3
grams per liter� No other warnings
are generated�
For closed circuit diving, the gas
density display turns yellow at 5�2
grams per liter and red at 6�3 grams
per liter� No other warnings are
generated�
Gas density is an approximation based on the diluent
gas and loop PPO2�
You may be surprised at how shallow gas density
warning colors appear�
Read more about why we chose these levels starting
on page 66 here (recommendations on page 73):
Anthony, T.G and Mitchell, S.J. Respiratory physiology
of rebreatherdiving. In: Pollock NW, Sellers SH,
Godfrey JM, eds. Rebreathers and Scientific Diving.
Proceedings of NPS/NOAA/DAN/AAUS June 16-19,
2015 Workshop. Durham, NC; 2016.
Dive End Time (DET)
This is similar to TTS but is
expressed as a time of day�
The time of day at which you
can expect to surface if you
depart immediately, ascend at
10mpm or 33fpm, change gases
when prompted, and perform all
decompression stops as directed�
TIME
TTS
OC 21/00 0 3
O2/HE NDL
24.0 22
DEPTH TIME STOP
SurGF
44
DENSITY
1 3
g
L
PPO2
71
%
1013
PRESSURE mBar
SURF
1011
NOW
28-Jun-15 16:31
DATE TIME
28-Jun-15 4:31
pm
DATE TIME
3
:
00
03-Mar-20 6 42
.
7
:
:
DATE DET
:
TIME
TTS
OC 21/00 0 3
O2/HE NDL
24.0 22
DEPTH TIME STOP
SurGF
44
DENSITY
5 3
g
L
PPO2
71
%
TIME
TTS
OC 21/00 0 3
O2/HE NDL
24.0 22
DEPTH TIME STOP
SurGF
44
DENSITY
6 4
g
L
PPO2
71
%
3
:
00
03-Mar-20 5 42
.
7
:
:
DATE TIMER
: