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14

CALIBRATION

The soil activity range is calibrated by performing the calibration of
the conductivity range.
Should the soil activity measurements be not calibrated, contact the
nearest Hanna service center for re-calibration.

CALIBRATION PROCEDURE

• Pour sufficient quantity of a conductivity

calibration solution (e.g. HI 7030) into
a beaker. If possible, use plastic beaker
to minimize any EMC interference.

• Immerse the conductivity probe in the

solution (approximately 5 cm/2").

• Press the ON/OFF button to turn the meter on, and then press

the "W" button to enter the Water Conductivity mode.

• Wait a couple of minutes for thermal equilibrium to be reached.
• Turn the calibration knob until the display shows the conductivity

value of the calibration solutions at 25°C (e.g. 12.88 mS/cm).

• All subsequent measurements will be compensated to 25°C (77°F).

The calibration is now complete and the meter is ready for use.

Notes:
• It is recommended to calibrate the meter at least once a month,

and every time the probe or the battery is changed.

• For more accurate measurements, use a calibration solution close to

the range to be measured. See the "Accessories" section for a
selection of conductivity calibration solutions.