42
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
DO MEASUREMENT
