Hanna Instruments HI98193 - Barometric Pressure Compensation

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)
OPERATIONAL GUIDE
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