12
13
ALTITUDE COMPENSATION
HI 9143
Press FACTOR and “F1” will
be displayed.
Use the UP and DOWN keys
to set the altitude from 0 to
1900 m, in steps of 100 m.
HI 9145
With HI 9145, all the DO readings refer to the
sea level. Altitude affects the DO concentration
by decreasing its value.
The following table reports the maximum oxygen
solubility at various temperatures and altitudes.
The table provides an idea of the error that can
be introduced at different altitudes and the
quantity to be subtracted to correct the reading.
SAMPLE
ppm
F1
or
or
SAMPLE
F2
ppm
°C
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
0 m
14.6
13.8
13.1
12.4
11.8
11.3
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
7.5
7.3
7.1
6.8
6.6
6.4
300 m
14.1
13.3
12.7
12.0
11.4
10.9
10.4
9.9
9.7
9.2
8.8
8.4
8.1
7.8
7.5
7.2
7.1
6.9
6.6
6.4
6.2
600 m
13.6
12.9
12.2
11.6
11.0
10.5
10.1
9.6
9.2
8.7
8.5
8.1
7.8
7.5
7.3
7.0
6.8
6.6
6.3
6.2
6.0
1200 m
12.7
12.0
11.4
10.8
10.3
9.8
9.4
9.0
8.6
8.3
7.9
7.7
7.3
7.0
6.8
6.5
6.4
6.2
5.9
5.7
5.6
1500 m
12.3
11.6
11.0
10.4
9.9
9.5
9.1
8.7
8.3
8.0
7.7
7.3
7.1
6.8
6.6
6.3
6.1
6.0
5.7
5.6
5.4
1800 m
11.8
11.2
10.6
10.1
9.6
9.2
8.8
8.3
8.0
7.7
7.4
7.1
6.8
6.6
6.3
6.1
5.9
5.8
5.5
5.4
5.2
°F
32.0
35.6
39.2
42.8
46.4
50.0
53.6
57.2
60.8
64.4
68.0
71.6
75.2
78.8
82.4
86.0
89.6
93.2
96.8
100.4
104.4
900 m
13.2
12.4
11.9
11.2
10.6
10.2
9.7
9.3
8.9
8.6
8.2
7.8
7.5
7.3
7.0
6.8
6.6
6.4
6.1
5.9
5.8
Altitude above Sea Level (in meters)
35 g/L
9.0
8.6
8.3
8.0
7.6
7.4
7.1
6.9
6.6
6.4
30 g/L
9.3
8.9
8.6
8.2
7.9
7.6
7.3
7.1
6.8
6.6
°C
10
12
14
16
18
20
22
24
26
28
0 g/L
11.3
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
10 g/L
10.6
10.1
9.7
9.3
8.9
8.5
8.2
7.9
7.6
7.4
20 g/L
9.9
9.5
9.1
8.7
8.4
8.0
7.8
7.5
7.2
7.0
Salinity (g/L) at Sea Level
°F
50.0
53.6
57.2
60.8
64.4
68.0
71.6
75.2
78.8
82.4
HI 9143
Press FACTOR twice and “F2”
will be displayed.
Press the UP and DOWN keys
to set the salinity between 0
and 40 g/L. Press FACTOR
again to display the temperature.
HI 9145
All DO readings refer to 0 g/L of salinity. Salinity
affects the DO concentration by decreasing its
value.
The table below shows the maximum solubility
of oxygen at various temperatures and salinity
levels. By using the table, the quantity to be
subtracted to correct the reading can be
calculated.
SALINITY COMPENSATION
