Hanna Instruments HI 4321 User Manual

Page 40

CONDUCTIVITY CALIBRATION

It is recommended to calibrate the instrument frequently, especially if high accuracy is required.
The conductivity range should be recalibrated:
• Whenever the conductivity probe is replaced.
• At least once a week.
• Before USP measurements.
• After testing aggressive chemicals.
• When calibration reminder is activated (“Conductivity Cal Expired”).
• If the readings are far from the calibration point.

Note:TDS and Resistivity readings are automatically derived from the conductivity readings and no specific

calibration is needed.

OFFSET CALIBRATION
The meter allows the user to calibrate the probe for the offset.
• Set the meter for conductivity range;
• Select the automatic standard recognition (see

Conductivity Setup

Calibration

);

• Leave the dry probe in the air;
• Enter in calibration mode by pressing

;

• Wait to stabilize. The 0.000

S calibration point will appear on the screen;

• Press

to finish the probe offset calibration.

• Press

to exit calibration mode or continue calibration in the other standard solutions.

Note: The offset calibration can be performed only if it is perfomed first (no other calibration points present).

Clear the old calibration if it is present to calibrate for the offset.

CELL CONSTANT CALIBRATION (in solution)

Single Point Calibration
• Select the single point calibration (see

Conductivity Setup

Calibration

);

•

Pour a small quantity of the standard solution into a clean beaker. If possible, use plastic beakers to

minimize any EMC interferences.
• For accurate calibration and to minimize cross-contamination, use two beakers for each standard solution
(one for rinsing the probe and another one for calibration).