Hanna Instruments HI 84429 - Manual (Page 34)

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If GLP pump is pressed, one of the next screens is displayed.
If a calibration hasn’t been performed the message “Not Calibrated” will be displayed.
The pump GLP displays the Time and Date of the last pump calibration.
pH MEASUREMENT
The HI 84429 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 since the last pH
calibration is greater than the number of days after wich a calibration time-out warning is
displayed the message “CAL DUE” will blink on the left side of the display (see Calibration
timeout option in Setup for details).
If CAL DUE is displayed perform an electrode calibration.
Press MENU to access the instrument’s menu.
Press HELP to view the contextual help, every time you need suplimentary information. The help
is customized for every situation that can appear during instrument usage.
Press STIR to start/stop the stirrer.
Press Titrator to enter titrator mode.
Press CAL to access the calibration menu.