Hanna Instruments HI 9141 - Manual (Page 13)

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FUNCTION
UP DOWN
ALTITUDE COMPENSATION
Press the FUNCTION key twice and “F1” will be
displayed.
Use the UP and DOWN keys to set the altitude
between 1 and 1900 m, in steps of 100 m
(1 meter = 3.28 feet).
Altitude affects the disssolved oxygen concen-
tration by decreasing its value. The following
table reports the maximum oxygen solubility at
various temperatures and altitudes.
FUNCTION
UP DOWN
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
°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, Meters above Sea Level
TEMPERATURE COMPENSATION
The DO probe features a built-in temperature
sensor, so that DO readings are automati-
cally compensated for temperature effects.
SALINITY COMPENSATION
Press FUNCTION key until “F2” is displayed.
Use the UP and DOWN keys to set the salinity
between 0 and 40 g/L.
Salinity affects the dissolved oxygen concen-
tration by decreasing its value. The table below
shows the maximum solubility of oxygen at
various temperature and salinity.