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Operational Guide

Calibration

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.

* pH 3.00 is only visible when using specic pH electrodes and will replace 4.01

pH 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.

The custom buers allow the user to calibrate in a buer solution dierent from

a standard one. Two custom buers can be set in SETUP menu. See page 23 for

more information about using custom buers.

The instrument will automatically skip custom buers which are in a ±0.2 pH

window of an already calibrated buer.

Submerse the pH electrode approximately 3 cm (1¼”) into a buer solution and

stir gently. Press CAL to enter calibration.

The “CAL” tag will appear and the “7.01” buer will be

displayed on the third LCD line. If necessary, press the

ARROW keys to select a dierent buer value. The “ ”

along with “STIR” tag will be displayed and “WAIT” will

blink on the LCD until the reading is stable.

When the reading is stable and close to the selected

buer, “CFM” tag will blink. Press CFM to conrm

calibration.

After conrming the rst point, the calibrated value

will be displayed on the rst LCD line and the second

expected buer value on the third LCD line (i.e. pH

4.01).

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Hanna Instruments Edge HI 2020 User Manual

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