Chapter 3
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Meter Setup Menus
Barometric Pressure Compensation Setting
Orion Star A213 RDO/DO meters and Orion Star A216 pH/RDO/DO meters
have an internal
barometer that can be used for automatic pressure compensated dissolved oxygen readings.
Manual entry of the barometric pressure can be used for automatic pressure compensated
dissolved oxygen readings, which is useful when dissolved oxygen is measured with a
submerged sensor or in a pressurized vessel. The pressure value must be entered as mm Hg.
1 mm Hg = 0.03937 inch Hg = 1.3332 hPa (mBar) = 0.01934 PSI
Salinity Correction Setting
Orion Star A213 RDO/DO meters and Orion Star A216 pH/RDO/DO meters are capable of
performing automatic salinity correction for dissolved oxygen readings (measured as mg/L)
when the salinity value of the sample is manually entered as ppt (parts per thousand) in the
setup menu.
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
5
3
20
13
35
25
6
4
21
14
36
25
7
4
22
15
37
26
8
5
23
15
38
27
9
6
24
16
39
28
10
6
25
17
40
29
11
7
26
18
42
30
12
8
27
18
44
32
13
8
28
19
46
33
14
9
29
20
48
35
15
10
30
21
50
37
16
10
31
22
52
38
17
11
32
22
54
40
18
12
33
23
56
42
19
13
34
24
Calculated from the International Oceanographic Tables, Vol. 1, National Institute of
Oceanography of Great Britain, Womley, Godaming, Surrey, England and Unesco, Paris 1971
40
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Orion Star A210 Series Benchtop Meter User Manual
Thermo Scientific
Summary of Contents for Orion Star A210 Series
Page 5: ......
