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pH
m
EASU
rE
m
ENT
16. pH MEASUREMENT
The
HI84502
can 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. From titrator mode press
Meter
until pH units are displayed.
If an electrode calibration hasn’t been performed, or the number of days exceeds the calibration time
out value set, the message “CAL DUE” will blink on the left side of the display (see Calibration Timeout
option in SETUP MENU 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 additional information.
Press
STIR
to start/stop the stirrer.
Press
Titrator
to enter titration mode.
Press
CAL
to access the calibration menu.
Press
LOG
to save the current reading. A message indicating the free log space will be displayed for
a few seconds.
In order to take pH measurements, follow the next steps:
• Submerge the pH electrode 2 cm (0.8’’) and the temperature probe into the sample to be tested
and stir gently. Make sure the PTFE junction is completely submersed. Allow time for the electrode to
stabilize. When the reading becomes stable the (unstable measurement) symbol will disappear.
