Hanna Instruments HI 84529 - Manual (Page 41)

www. hannainst .com 41 Operational Guide
If CAL DUE is displayed perform an
electrode calibration.
Options:
Press MENU to access the instrument’s
menu.
Press HELP to view the contextual help
whenever 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. Allow time for the electrode
to stabilize. When the reading becomes
stable, the (unstable measurement)
symbol will disappear.
If the pH reading is less than -2.00 pH or
greater than 16.00 pH, the closest full-
scale value will be displayed blinking.
If measurements are taken successively
in different samples, it is recommended
to rinse the electrodes thoroughly with
deionized or distilled water and then
with some of the next sample to prevent
cross-contamination.
The pH measurements are affected by temperature. In order to have accurate
pH measurements, the temperature effect must be compensated for. To use the
Automatic Temperature Compensation (ATC) feature, connect and submerge
the HI 7662-T temperature probe into the sample as close as possible to the
electrode and wait for a few seconds. The “ATC” message will be shown on the
pH
Measurement