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Press
HELP
to view the contextual help, every time you need supplementary 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.
Press
LOG
to memorize 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 bulb 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
(-2.00 pH or 16.00 pH) will be displayed blinking.
If measurements are taken successively in different samples, it is recommended to rinse the
electrodes thoroughly with deionized water or tap water and then with some of the next sample
to prevent cross-contamination.
The pH measurement is 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-M
temperature probe into the sample in the
dedicated guide tube and wait for a few seconds. The
“ATC”
message will be shown on the
