3
Example
The example plot below shows Winkler oxygen divided by φ versus SBE 43 output voltage, and includes a linear
regression line calculated from the data.
In this example, the new Soc value is 0.4586. The new Voffset value is:
5185.0
4586.0
2378.02378.0
−=
−
=
−
=
Soc
Voffset
The next plot summarizes the results of the calibration. The diamonds are differences between the SBE 43 dissolved
oxygen and Winkler titration dissolved oxygen, using the original calibration. The squares are differences between
SBE 43 dissolved oxygen and Winkler titration dissolved oxygen, using Soc and Voffset derived above.
W/phi = 0.4586V - 0.2378
R
2
= 0.9997
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
SBE 43 Voltage
Winkler/phi
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0123456
Winkler Oxygen (ml/l)
Oxygen Difference (SBE43 - Winkler)
Original Coefficients
Winkler Derived Coef ficients
Figure 2.
Winkler oxygen / φ
Figure 3.
Calibration
results
238
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