Hanna-instruments HI 2214 Instrukcja Użytkownika Pobierz pdf (Strona 10)

3 cm

(1¼")

PROCEDURE

Calibration can be performed up to five-points.

For accurate measurements a three-point calibration is recommended.

The calibration buffer can be selected from the calibration buffer list that

includes custom buffers and the memorized standard buffers:

• pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45.

The custom buffers allow the user to calibrate in a buffer solution different

from a standard one. Up to two custom buffers can be set in SETUP menu

(see page 26). Each custom buffer value can be changed in a ±1.0 pH

window around the set value, during calibration, when it is selected; the

“BUFFER pH” tag will blink.

The instruments will automatically skip the buffer used during calibration

and the buffers which are in a ±0.2 pH window, around one of the

calibrated buffers.

All new calibrations will override existing stored calibration data in a

±0.2 pH window. The slopes adjacent to the new points will be

reevaluated.

FIVE-POINT CALIBRATION

• Submerse the pH electrode and the temperature

probe approximately 3 cm (1¼”) into a buffer

solution and stir gently. The temperature probe

should be close to the pH electrode.

• Press CAL. The “CAL” and “

BUF

” tags will

appear and the “7.01” buffer will be displayed

on the secondary LCD.

• If necessary, press the ARROW keys to select a different buffer value.

• The “ ” tag will blink on the LCD until the reading is stable.

• When the reading is stable and close to the selected

buffer, the “READY” tag will be displayed and the

“CFM” tag will blink.

• Press CFM to confirm calibration.

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Hanna-instruments HI 2214 Instrukcja Użytkownika Strona 10