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It is recommended to calibrate the instrument frequently, especially if high

accuracy is required.

The ISE range should be recalibrated:

• Whenever the ISE probe or ion charge is changed.

• At least once a day.

• After testing aggressive chemicals.

• When calibration alarm time out is expired- “CAL DUE” warning blinks (if

feature is enabled).

Follow instructions for the individual electrode.

Due to electrode conditioning time, the electrode must be kept immersed a few

seconds to stabilize. The user will be guided step by step during calibration

with easy to follow messages on the LCD. This will make the calibration a simple

and error-free procedure.

PROCEDURE

Select the proper ISE probe in SETUP menu (only for HI 3222) or select the

proper Ion Charge slope (see SETUP for details, page 31).

Note: If the ISE probe has not been previously calibrated (at least one point),

the “----” will be displayed.

Pour small quantities of the buffer solutions into clean beakers. 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 electrode and one for calibration.

The HI 3221 instrument offers a choice of six standard solutions: 0.1, 1, 10,

100, 1000, 10000 ppm and calibration up to 2 points. The HI 3222 offers

additional ranges for other concentration units. These cover 5 decades of

concentration. The HI 3222 permits a 5 point calibration. It is advised to

bracket expected ion concentration with your standards. For fluoride electrode

the 2 ppm standard is also available (HI 3222 only).

Remove the protective cap from the ISE electrode.

SESE

CALIBRATION CALIBRATION

CALIBRATION

(HI (HI

(HI

3221 &3221 &

3221 &

HI HI

3222 3222

3222

))

)

Hanna Instruments HI 3221 User Manual

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