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SALINITY AND ALTITUDE COMPENSATION
11
Whenever measurements are taken with a non-polarized probe, the oxygen level revealed
is both that of the tested solution, as well as that present in the electrolyte solution. This
reading is incorrect.
The calibration of this instrument is very simple.
Before proceeding with the calibration, make sure the probe is ready for measurements
(see PROBE CONNECTION & PREPARATION), i.e. the membrane cap is filled with electrolyte
and the probe is connected to the meter and properly polarized.
For an accurate calibration, it is recommended to wait at least 15 minutes to ensure
precise conditioning of the probe.
Keep the protective cap on during polarization time and remove it for calibration and
measurements. Follow the calibration procedure (see D.O. CALIBRATION).
7. SALINITY AND ALTITUDE COMPENSATION
If the sample contains significant concentration of salinity or if you are performing
measurements at an altitude different from sea level, the read out values must be
corrected, taking into account the lower degree of oxygen solubility in these situations
(see SETUP).
Remember to set the altitude and/or the salinity before taking any D.O. measurements.
The meter will automatically compensate for these factors.