Dissolved Oxygen Settings; Barometric Pressure Compensation; Salinity Correction - Thermo Scientific Orion Versa Star Pro User Manual

Thermo Scientific

Dissolved Oxygen Settings

Barometric Pressure Compensation

The Versa Star Pro meter with RDO/DO module has an internal barometer that can be used for
automatic pressure compensated dissolved oxygen readings. Manual barometric pressure
compensation can also be used if dissolved oxygen is measured with a submerged probe or in
a pressurized vessel. The pressure must be entered as mm Hg.
1 mm Hg = 0.03937 inch Hg = 1.3332 hPa (mBar) = 0.01934 PSI

Salinity Correction

Automatic salinity correction for dissolved oxygen readings reported as mg/L is available on the
Versa Star Pro meter with RDO/DO module when a conductivity module and conductivity probe
are used simultaneously. The meter uses the conductivity value read by the conductivity probe
to calculate the salinity correction factor and applies the factor to dissolved oxygen readings
reported as mg/L. Manual salinity correction can be used for dissolved oxygen readings
reported as mg/L on all Versa Star Pro meters with RDO/DO module. The manual salinity
correction factor must be entered as ppt (parts per thousand).
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.
Appendix A
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 Versa Star Pro Meter User Manual

Channel Specific Settings and Features
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
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