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Operational Guide

Calibration

pH operation in standard mode oers full function of edge™ meter. This

includes seven standard buers and two custom ones. Five pH buers may

be used for calibration.

The instrument should be recalibrated whenever:

• High accuracy and sensor verication are required.

• The pH electrode is replaced.

• At least once a week.

• After testing aggressive chemicals.

• If ”CAL DUE” is displayed on the 3rd LCD line.

Every time you calibrate the instrument use fresh buers and perform an

electrode maintenance as required. It is advised to choose calibration buers

that bracket the sample pH.

Preparation

Pour small quantities of the buer solutions into clean beakers. If possible,

use plastic to minimize any EMC interferences.

For accurate calibration and to minimize cross-contamination, use two

beakers for each buer solution. One for rinsing the electrode and one for

calibration. If you are measuring in the acidic range, use pH 7.01 or 6.86 as the

rst buer and pH 4.01 (or 3.00*) as the second buer. If you are measuring

in the alkaline range, use pH 7.01 or 6.86 as rst buer and pH 10.01 or 9.18

as the second buer.

Procedure

Calibration can be performed using up to ve calibration buers. For accurate

measurements, a minimum of a three-point calibration is recommended. The

calibration buer can be selected from the calibration buer list that includes

the custom buers and the standard buers:

pH 1.68, 4.01 (pH 3.00*), 6.86, 7.01, 9.18, 10.01 and 12.45.

* pH 3.00 is only visible when using specic pH electrodes and will replace

4.01 pH buer.

Hanna Instruments Edge User Manual

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