Probe Polarization, Calibration Procedure

PROBE POLARIZATION:

•A dissolved oxygen probe must be polarized to function properly.

•To polarize the probe, the fully assambled probe must be connected to the meter and the meter must be on.

•During polarization (and during measurement), approximately 800 mV is applied to the cathode and anode inside the membrane and a chemical reaction occurs. During the polarization period excess oxygen in the electrolyte is consumed. During this phase, probe movement that “moves” the electrolyte will yield jumpy measurements. When a probe is totally polarized moving the probe will not effect the measurement.

•When the meter is turned off, the probe will revert to it’s prepolarized state. Before using again, the probe will have to be repolarized.

CALIBRATION PROCEDURE:

The calibration is very simple and fast.

• Make sure the probe is ready for measurements (see Probe Preparation), i.e. the membrane is filled with electrolyte and the probe is connected to the meter.

• Switch the meter on by pressing the ON/OFF key.

• For an accurate calibration, it is recommended to wait at least 15 minutes to ensure polarization of the probe.

• Remove the protective cap from the D.O. probe.

MW600 specifications

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