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Thermo Scientific
Barometric Pressure Compensation Setting
Orion Star A323 RDO/DO meters, Orion Star A326 pH/RDO/DO meters and Orion Star A329
pH/ISE/conductivity/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 A323 RDO/DO meters, Orion Star A326 pH/RDO/DO meters and Orion Star A329
pH/ISE/conductivity/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.
Orion Star A329 pH/ISE/conductivity/RDO/DO meters offer the additional option of using the
measured conductivity value of a sample for automatic salinity correction of dissolved oxygen
measurements. The conductivity sensor and dissolved oxygen sensor must be placed in the
same sample during the dissolved oxygen measurement for proper salinity correction.
Conductivity
Salinity
at 20 °C
Correction
(mS/cm)
Value (ppt)
5
3
6
4
7
4
8
5
9
6
10
6
11
7
12
8
13
8
14
9
15
10
16
10
17
11
18
12
19
13
Calculated from the International Oceanographic Tables, Vol. 1, National Institute of
Oceanography of Great Britain, Womley, Godaming, Surrey, England and Unesco, Paris 1971
Conductivity
Salinity
at 20 °C
Correction
(mS/cm)
Value (ppt)
20
13
21
14
22
15
23
15
24
16
25
17
26
18
27
18
28
19
29
20
30
21
31
22
32
22
33
23
34
24
Orion Star A320 Series Portable Meter User Manual
Chapter 3
Meter Setup Menus
|
Conductivity
Salinity
at 20 °C
Correction
(mS/cm)
Value (ppt)
35
25
36
25
37
26
38
27
39
28
40
29
42
30
44
32
46
33
48
35
50
37
52
38
54
40
56
42
45
|
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