Hanna-instruments HI 98180 Manual do Utilizador descarregar pdf (Página 27)

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 week.

• After testing aggressive chemicals.

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

feature is enabled).

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 tags 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 98185) or select the

proper Ion Charge (see SETUP for details, page 33).

Note: If ISE probe is not calibrated in 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 instrument offers a choice of six memorized standard solutions: 0.1, 1, 10,

100, 1000, 10000 ppm and calibration up to five points. For fluoride

electrode the 2 ppm standard is also available (HI 98185 only).

Remove the protective cap from the ISE electrode.

FIVE-POINT CALIBRATION

• Immerse the ISE electrode approximately 4 cm (1½”)

into the less concentrated standard solution and stir

gently.

SESE

CALIBRATION CALIBRATION

CALIBRATION

(HI 981(HI 981

(HI 981

84 &84 &

84 &

HI 981 HI 981

HI 981

8585

))

)

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Hanna-instruments HI 98180 Manual do Utilizador Página 27