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13
BAROMETRIC PRESSURE COMPENSATION
The dissolved oxygen saturation value varies with pressure, so it is important to compensate the effect
that pressure has on DO measurements.
°C
Altitude, Meters above Sea Level
°F
0
m
300
m
600
m
900
m
1200
m
1500
m
1800
m
2100
m
2400
m
2700
m
3000
m
3300
m
3600
m
3900
m
4000
m
0 14.6 14.1 13.6 13.1 12.6 12.1 11.7 11.2 10.8 10.4 10.0 9.7 9.3 9.0
8.9
32.0
2 13.8 13.3 12.8 12.4 11.9 11.5 11.0 10.6 10.2 9.9
9.5 9.2 8.8 8.5
8.4
35.6
4 13.1 12.6 12.2 11.7 11.3 10.9 10.5 10.1 9.7
9.3
9.0 8.7 8.4 8.0
7.9
39.2
6 12.4 12.0 11.5 11.1 10.7 10.3 9.9
9.6 9.2
8.9
8.6 8.2 7.9 7.6
7.5
42.8
8 11.8 11.4 11.0 10.6 10.2 9.8
9.5
9.1 8.8
8.4
8.1 7.8 7.5 7.3
7.2
46.4
10 11.3 10.9 10.5 10.1 9.7
9.4
9.0
8.7 8.4
8.1
7.8 7.5 7.2 6.9
6.8
50.0
12 10.8 10.4 10.0 9.6 9.3
8.9
8.6
8.3 8.0
7.7
7.4 7.1 6.9 6.6
6.5
53.6
14 10.3 9.9 9.6 9.2 8.9
8.5
8.2
7.9 7.6
7.4
7.1 6.8 6.6 6.3
6.2
57.2
16 9.9 9.5 9.2 8.8 8.5
8.2
7.9
7.6 7.3
7.0
6.8 6.5 6.3 6.1
6.0
60.8
18 9.5 9.1 8.8 8.5 8.1
7.8
7.6
7.3 7.0
6.8
6.5 6.3 6.0 5.8
5.7
64.4
20 9.1 8.8 8.4 8.1 7.8
7.5
7.3
7.0 6.7
6.5
6.2 6.0 5.8 5.6
5.5
68.0
22 8.7 8.4 8.1 7.8 7.5
7.2
7.0
6.7 6.5
6.2
6.0 5.8 5.6 5.4
5.3
71.6
24 8.4 8.1 7.8 7.5 7.2
7.0
6.7
6.5 6.2
6.0
5.8 5.6 5.4 5.2
5.1
75.2
25 8.3 8.0 7.7 7.4 7.1
6.8
6.6
6.4 6.1
5.9
5.7 5.5 5.3 5.1
5.0
77.0
26 8.1 7.8 7.5 7.2 7.0
6.7
6.5
6.2 6.0
5.8
5.6 5.4 5.2 5.0
4.9
78.8
28 7.8 7.5 7.3 7.0 6.7
6.5
6.2
6.0 5.8
5.6
5.4 5.2 5.0 4.8
4.7
82.4
30 7.6 7.3 7.0 6.8 6.5
6.3
6.0
5.8 5.6
5.4
5.2 5.0 4.8 4.6
4.6
86.0
32 7.3 7.0 6.8 6.5 6.3
6.1
5.8
5.6 5.4
5.2
5.0 4.8 4.7 4.5
4.4
89.6
34 7.1 6.8 6.6 6.3 6.1
5.9
5.6
5.4 5.2
5.0
4.9 4.7 4.5 4.3
4.3
93.2
36 6.8 6.6 6.3 6.1 5.9
5.7
5.5
5.3 5.1
4.9
4.7 4.5 4.4 4.2
4.1
96.8
38 6.6 6.4 6.1 5.9 5.7
5.5
5.3
5.1 4.9
4.7
4.5 4.4 4.2 4.1
4.0 100.4
40 6.4 6.2 5.9 5.7 5.5
5.3
5.1
4.9 4.7
4.6
4.4 4.2 4.1 3.9
3.9 104.4
42 6.2 6.0 5.8 5.6 5.3
5.2
5.0
4.8 4.6
4.4
4.3 4.1 4.0 3.8
3.8 107.6
44 6.0 5.8 5.6 5.4 5.2
5.0
4.8
4.6 4.5
4.3
4.1 4.0 3.8 3.7
3.7 111.2
46 5.8 5.6 5.4 5.2 5.0
4.8
4.7
4.5 4.3
4.2
4.0 3.9 3.7 3.6
3.5 114.8
48 5.7 5.5 5.3 5.1 4.9
4.7
4.5
4.4 4.2
4.0
3.9 3.7 3.6 3.5
3.4 118.4
50 5.5 5.3 5.1 4.9 4.7
4.6
4.4
4.2 4.1
3.9
3.8 3.6 3.5 3.4
3.3 122.0
Note: The relationship between salinity and chlorinity for seawater is given by the equation
below: Salinity (g/l) = 1.80655 Chlorinity (g/l)
OPERA
TIONAL GUIDE
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