3 Basic Operation
61
Span setting values for calibration in air
The software should display these values when auto calibration is performed.
Use this table to input values for manual span calibrations in air.
Tip
The DO measurement value of “air-saturated water” and air are different.
Due to the pressure difference against the membrane in air versus the membrane in water, the
measurement value in air is about 10% higher than the value of air-saturated water on average.
Amounts of saturated dissolved oxygen in air at various temperatures
Following tables are applicable only to the air calibration of the U-50 DO sensor. Do not use
them for other purpose.
Air calibration value converted from amounts of saturated dissolved oxygen in water at various
temperatures (salinity = 0.0%) JIS K0101
Air calibration value converted from amounts of saturated dissolved oxygen in water at various
temperatures (salinity = 0.0%) ISO5814
Temp
(
C)
DO (mg/L)
Temp
(
C)
DO (mg/L)
Temp
(
C)
DO (mg/L)
Temp
(
C)
DO (mg/L)
0
15.58
1
15.15
11
11.74
21
9.55
31
8.16
2
14.74
12
11.47
22
9.38
32
8.05
3
14.34
13
11.22
23
9.23
33
7.94
4
13.97
14
10.97
24
9.08
34
7.84
5
13.61
15
10.74
25
8.92
35
7.74
6
13.27
16
10.52
26
8.79
36
7.63
7
12.93
17
10.31
27
8.66
37
7.55
8
12.62
18
10.10
28
8.53
38
7.44
9
12.31
19
9.91
29
8.40
39
7.35
10
12.01
20
9.72
30
8.28
40
7.25
Temp.
(
C)
DO (mg/L)
Temp.
(
C)
DO (mg/L)
Temp.
(
C)
DO (mg/L)
0
16.08
1
15.64
11 12.13
21
9.80
2
15.21
12
11.86
22
9.61
3
14.81
13
11.59
23
9.44
4
14.42
14
11.34
24
9.26
5
14.05
15
11.09
25
9.09
6
13.70
16
10.86
26
8.92
7
13.35
17
10.63
27
8.77
8
13.02
18
10.42
28
8.61
9
12.72
19
10.21
29
8.46
10
12.42
20
10.00
30
8.32
Содержание U-51
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