Table of Contents
Advertisement
Table 10.2. No-decompression time limits for various depths (ft)
No-decompression time limits (mins) for various depths (ft)
Depth
(ft)
P0/A0
30
--
40
120
50
69
60
50
70
36
80
28
90
22
100
17
110
13
120
10
130
9
140
7
150
6
10.2.3. Altitude diving
The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a
higher altitude, you will have additional nitrogen in your body, compared to the equilibrium
situation at the original altitude. This "additional" nitrogen is released gradually over time
and equilibrium is restored. It is recommended that you acclimatize to a new altitude by
waiting at least three hours before making a dive.
Before high-altitude diving, the instrument must be set to the Altitude Adjustment mode
to adjust the calculations for the new altitude. The maximum partial pressures of nitrogen
allowed by the mathematical model of the dive computer are reduced according to the
lower ambient pressure.
As a result, the allowed no-decompression-stop limits are considerably reduced.
10.3. Oxygen exposure
The oxygen exposure calculations are based on currently accepted exposure time limit
tables and principles. In addition to this, the dive computer uses several methods to
conservatively estimate the oxygen exposure. For example:
•
the displayed oxygen exposure calculations are raised to the next higher percentage
value
for recreational scuba diving, the recommended upper limit of 1.4 bar PO
•
a default
the CNS % limits up to 1.6 bar are based on 1991 NOAA Diving Manual limits
•
the OTU monitoring is based on the long-term daily tolerance level and the recovery
•
rate is reduced
Oxygen related information displayed by the dive computer is also designed to ensure
that all warnings and displays occur at the appropriate phases of a dive. For example, the
following information will be shown before and during a dive when the computer is set in
NITROX mode:
the selected O
•
OLF% alternative display for either CNS% or OTU% (whichever is larger)
•
for the first dive of a series
Personal Mode / Altitude Mode
P0/A1
P0/A2
160
127
86
65
56
41
38
29
29
22
23
19
18
15
14
11
11
9
9
8
7
6
6
5
5
4
% on the alternative display
2
P1/A0
P1/A1
160
127
92
86
65
52
56
41
34
38
29
25
29
22
20
23
19
15
18
15
11
14
11
9
11
9
7
9
8
6
7
6
5
6
5
4
5
4
4
P1/A2
P2/A0
P2/A1
127
92
65
52
41
34
29
25
22
20
19
15
15
11
11
9
9
7
8
6
6
5
5
4
4
4
P2/A2
73
43
28
20
15
11
9
7
6
5
4
4
3
is used as
2
53
- Quick Links:
- Nitrox
Hide quick links:
Advertisement
Table of Contents
