Hanna-instruments HI 4521 Manual do Utilizador descarregar pdf (Página 51)

ISE CALIBRATIONISE CALIBRATION

ISE CALIBRATION

(HI 4522 only)(HI 4522 only)

(HI 4522 only)

For greatest accuracy, it is recommended to calibrate the instrument frequently. The instrument should also be recalibrated

whenever “No ISE Calibration” or “ISE Calibration Expired” message appears on the LCD, in the Reminder messages area.

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 display. This will make

the calibration a simple and error-free procedure.

PREPARATION

Pour small quantities of the standard 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.

Note: For accurate measurements, add the appropriate ISAB (Ionic Strength Adjustment Buffer) to the

calibration standards.

CALIBRATION PROCEDURE

Up to five-point calibration is possible, using five memorized standard solutions: 0.1, 1, 10, 100, 1000 ppm

and 5 custom solutions.

The ISE calibration and measurement can be performed with or without temperature compensation. If the

temperature compensation option is enabled, the isopotential point of the electrode must be set in ISE Setup in

order to perform correct concentration measurements.

Before calibrating, make sure that the appropriate Electrode Type has been selected in ISE Setup according to the

measured Ion/compound.

ISE Calibration screen description

Reading Mode

This option allows the user to select between

Direct

Direct / AutoHold,

Direct/USP

conductivity reading modes.

To set the reading mode:

• Use or to select the

Reading Mode

option.

• Press and use or to highlight the

desired option.

• Press to confirm your selection or press

cancel operation.

Delete Profile

To delete one of the existing profiles:

• Use or to select the

Profile

option.

• Press

and use or to highlight the

Delete Profile

option.

• Press

A list with all customised profiles will appear on

the screen.

• Use or to select the desired profile and press

• Press

to return to the previous menu.

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