Hanna Instruments HI 4421 - Manual (Page 36)

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Keep the protective cap on during polarization time and remove it for calibration and measurements.
To calibrate the meter:
• Insert and rinse the probe in the first beaker in order to
decontaminate it;
• Insert the probe in the second beaker;
• Tap the probe repeatedly to remove any air bubbles that may
be trapped inside the sleeve.
• Enter in calibration mode by pressing ;
• Wait to stabilize;
• You can delete a previously performed calibration by pressing
.
When the automatic standard recognition is selected:
• The calibration point will be automatically selected from the two standards available.
• Press
to perform the calibration or to exit calibration.
Note:If you want to perform automatic DO calibration in two points, perform the calibration at 0% saturation
first and then at 100% saturation.
When the user standard is selected:
• The calibration can be performed only in one point.
• Edit the desired standard value by using
and .
• Press to finish the calibration or to exit calibration.