Milwaukee Understanding Altitude Compensation and its Impact on Instruments at Elevation Above Sea Level

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ALTITUDE COMPENSATION:

The displayed measurements are referenced to sea level pressures. At higher elevations, oxygen solubility decreases (thus at higher elevations actual oxygen concentrations are really lower than the displayed value).

The table below illustrates the changes in the solubility of oxygen in air saturated fresh water as a result of changes in elevation. The table can also be used to correct the displayed measurement. If the meter was calibrated at an elevation above sea level, you multiply your reading by the ratio of:

(ppm at the elevation) / (the ppm at sea level)

For example: You are at 600 m above sea level and the meter displays 3.2 ppm. The temperature is 14 °C.

To correct your measurement multiply the displayed measurement by the ratio of (ppm reading at 600 m) / (ppm reading at 0 m) =

3.2ppm X (9.6 ppm/10.3 ppm) = 2.98 ppm (or 3.0 ppm altitude corrected).

°C

 

Altitude, Meters above Sea Level

 

°F

0 m

300 m

600 m

900 m

1200 m

1500 m

1800 m

 

 

 

 

 

 

 

 

 

 

 

0

14.6

14.1

13.6

13.2

12.7

12.3

11.8

32.0

2

13.8

13.3

12.9

12.4

12.0

11.6

11.2

35.6

4

13.1

12.7

12.2

11.9

11.4

11.0

10.6

39.2

6

12.4

12.0

11.6

11.2

10.8

10.4

10.1

42.8

8

11.8

11.4

11.0

10.6

10.3

9.9

9.6

46.4

10

11.3

10.9

10.5

10.2

9.8

9.5

9.2

50.0

12

10.8

10.4

10.1

9.7

9.4

9.1

8.8

53.6

14

10.3

9.9

9.6

9.3

9.0

8.7

8.3

57.2

16

9.9

9.7

9.2

8.9

8.6

8.3

8.0

60.8

18

9.5

9.2

8.7

8.6

8.3

8.0

7.7

64.4

20

9.1

8.8

8.5

8.2

7.9

7.7

7.4

68.0

22

8.7

8.4

8.1

7.8

7.7

7.3

7.1

71.6

24

8.4

8.1

7.8

7.5

7.3

7.1

6.8

75.2

26

8.1

7.8

7.5

7.3

7.0

6.8

6.6

78.8

28

7.8

7.5

7.3

7.0

6.8

6.6

6.3

82.4

30

7.5

7.2

7.0

6.8

6.5

6.3

6.1

86.0

32

7.3

7.1

6.8

6.6

6.4

6.1

5.9

89.6

34

7.1

6.9

6.6

6.4

6.2

6.0

5.8

93.2

36

6.8

6.6

6.3

6.1

5.9

5.7

5.5

96.8

38

6.6

6.4

6.2

5.9

5.7

5.6

5.4

100.4

40

6.4

6.2

6.0

5.8

5.6

5.4

5.2

104.0

 

 

 

 

5

 

 

 

 

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Contents Smart do Meter Probe Preparation Calibration Procedure Probe PolarizationZero Calibration Altitude & Salinity Compensation Taking MeasurementsAltitude Compensation Altitude, Meters above Sea LevelSalinity Compensation Probe & Membrane Maintenance Side to side 4-5 times. This will be enough to polish Battery Replacement Optional AccessoriesSpecifications WarrantyMilwaukee

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