12
SALINITY COMPENSATION
If the sample contains significant concentration of salinity, the read out values must be corrected, taking
into account the lower degree of oxygen solubility in this situation. Before taking any DO measurements
remember to set the salinity value from the SETUP menu (page 30).
The salinity affects the DO concentration, decreasing its value. The table below shows the maximum
oxygen solubility at various temperatures and salinity levels.
°C
Salinity (g/l) at Sea Level
°F
0 g/l
10 g/l 20 g/l 30 g/l
35 g/l
0
14.60
13.64
12.74
11.90
11.50
32.0
2
13.81
12.91
12.07
11.29
10.91
36.5
4
13.09
12.25
11.47
10.73
10.38
39.2
6
12.44
11.65
10.91
10.22
9.89
42.8
8
11.83
11.09
10.40
9.75
9.44
46.4
10
11.28
10.58
9.93
9.32
9.03
50.0
12
10.77
10.11
9.50
8.92
8.65
53.6
14
10.29
9.68
9.10
8.55
8.30
57.2
16
9.86
9.28
8.73
8.21
7.97
60.8
18
9.45
8.90
8.39
7.90
7.66
64.4
20
9.08
8.56
8.07
7.60
7.38
68.0
22
8.73
8.23
7.77
7.33
7.12
71.6
24
8.40
7.93
7.49
7.07
6.87
75.2
25
8.24
7.79
7.36
6.95
6.75
77.0
26
8.09
7.65
7.23
6.83
6.64
78.8
28
7.81
7.38
6.98
6.61
6.42
82.4
30
7.54
7.14
6.75
6.39
6.22
86.0
32
7.29
6.90
6.54
6.19
6.03
89.6
34
7.05
6.68
6.33
6.01
5.85
93.2
36
6.82
6.47
6.14
5.83
5.68
96.8
38
6.61
6.28
5.96
5.66
5.51
100.4
40
6.41
6.09
5.79
5.50
5.36
104.0
42
6.22
5.93
5.63
5.35
5.22
107.6
44
6.04
5.77
5.48
5.21
5.09
111.2
46
5.87
5.61
5.33
5.07
4.97
114.8
48
5.70
5.47
5.20
4.95
4.85
118.4
50
5.54
5.33
5.07
4.83
4.75
122.0
OPERA
TIONAL GUIDE
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