Hanna Instruments HI 84432 - Manual (Page 34)

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If GLP pump is pressed, one of the next screens is displayed.
The pump GLP displays the Time and Date of the last pump calibration.
If a calibration hasn’t been performed the message “Not Calibrated” will be displayed.
pH MEASUREMENT
The HI 84432 may be used as a pH meter for direct measurements.
Verify that the instrument has been calibrated before taking pH measurements. Set the
instrument to pH meter. At power up the instrument enters pH meter mode. From titrator mode
press ESC until pH units are displayed.
If an electrode calibration hasn’t been performed, or the number of days exceedes calibration
time out value set, the message “CAL DUE” will blink on the left side of the display (see
Calibration timeout option in Setup for details).
Place calibrated pH electrode into electrode holder. Open the fill hole.
Rinse the pH tip with distilled or deionized water. Immerse the pH bulb (bottom 2 cm / 0.8”)
in the sample and stir gently for a few seconds.
For a faster response and to avoid cross-contamination of the samples, rinse the electrode tip
with a few drops of the solution to be tested, before taking measurements. Press LOG to record
sample pH in instrument pH log.
If CAL DUE is displayed perform an electrode calibration.
Press MENU to access the instrument’s menu.