NOTE REGARDING THE CORRECTION COEFFICIENT
The correction coefficient different from the nominal one 1.0 is needed for the following reasons:
• To expand the scale of the oxygen sensor readings. For example, on entering a correction
coefficient of 10, the readout will be multiplied by a factor of 10.
• In case of moored applications, where the CTD remains steady measuring for long periods,
a coefficient different from 1 can be entered to compensate for the stirring effect on the
surface membrane.
At the end of the calibration procedure the below message appear and the calibration is
concluded.
C6.5 O2 PPM CALIBRATION
Once selected the OPT_O2 sensor from the list the below message appear on the ITERM window:
OPT_O2 sensor calibration
OPTICAL OXYGEN - Calibration
Scale factor from uMol/l to ppm:0.032
The optical dissolved oxygen sensor measuring unit calculates the dissolved oxygen
concentration in µmol/L and in % of saturation. The concentration in µmol/L can be converted
customizing the coefficients as follows:
Dissolved O2 concentration mg/L = ppm Scale factor: [mg/L] = [μmol/L] x 0.032
Dissolved O2 concentration mL/L = ppm Scale factor: [mL/L] = [μmol/L] x 0.02241
C6.6 BLUE CAP MEMBRANE STORAGE
A black cap is provided to protect the membrane from light. When the CTD is not used protect
the membrane by installing the black cap.
C6.7 BLUE CAP DEPLOYMENT
A black cap is provided to protect the membrane from light. PLEASE remove the black cap before
calibration and before deploying the CTD in water.
C.6.8 BLUE CAP CLEANING
At the end of the OCEAN SEVEN 3xx general cleaning, remove the blue cap and clean the
membrane using a 3 % H2O2, ethanol or a soap solution. Gently wash the membrane using a soft
brush
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