NAVI D-25 Instruction Manual page 210

Saturated
Temp.
DO
(ºC)
(mg/L)
1 13.77
2 13.40
3 13.04
4 12.70
5 12.37
6 12.06
7 11.75
8 11.47
9 11.19
10 10.92
D-52/53/54/55
when air is made to saturate water at a high elevation,
where the air pressure is, for example, 506.5 hPa (which
is equal to 1013 hPa × 1/2), the DO will be 4.06 mg/L
(which is equal to 8.11 mg/L × 1/2).
As explained above, careful attention must by paid to
atmospheric pressure when calibrating a DO meter. Air
pressure does not present any special problem when a
DO meter is used near sea level, but when it is used at
especially high altitudes, it is necessary to correct for the
air pressure.
The D-55 meter has a built-in air-pressure correction
function.
Set the atmospheric pressure in the pH meter when
calibrating and the meter will automatically be calibrated
using the air-pressure corrected value. Air-pressure
correction is calculated using the equation below.
When calibration is finished, the value derived from this
equation is displayed.
Compensated value = (1013/P) x measured value
P is the air pressure (hPa) set in the meter.
Saturated DO
temperatures (with a salinity concentration of
0.00 ppt)
Saturated
Temp.
DO
(ºC)
(mg/L)
11 10.67
12 10.43
13 10.20
14 9.97
15 9.76
16 9.56
17 9.37
18 9.18
19 9.01
20 8.84
7.5 Dissolved oxygen measurement
levels in water
Saturated
Temp.
DO
(ºC)
(mg/L)
21 8.68
22 8.53
23 8.39
24 8.25
25 8.11
26 7.99
27 7.87
28 7.75
29 7.64
30 7.53
7 Reference
at various
Saturated
Temp.
DO
(ºC)
(mg/L)
31 7.42
32 7.32
33 7.22
34 7.13
35 7.04
36 6.94
37 6.86
38 6.76
39 6.68
40 6.59
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