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49
pH MEASUREMENT
DIRECT MEASUREMENT
To measure the pH of a sample using the Direct reading
mode:
• Press
and then to select pH Mea-
sure mode (select channel first for HI5222).
• Select the Direct reading mode (see pH Setup for
details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1.5”) into the sample to be
tested. Allow time for the electrode to stabilize.
“Stable” will appear.
• The measured pH value will be displayed on the LCD,
together with a short GLP information and display preferences.
Note: If the reading is out of range, “----” will be displayed on the LCD.
DIRECT/AUTOHOLD MEASUREMENT
To measure pH of a sample using the Direct/AutoHold
reading mode:
• Press
and then to select pH Mea-
sure mode (for the selected channel - HI5222 only).
• Select the Direct/AutoHold reading mode (see pH
Setup for details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1.5”) into the sample to be
tested.
• The measured pH value will be displayed on the LCD.
Press
and the “AutoHold” indicator will
start blinking on the LCD until the stability criteria is
reached. The pH value will be frozen on the LCD, along with “AutoHold” indicator.
• To return to normal Measure mode press .
Note: If the reading is out of range, “----” will be displayed on the LCD.
Verify the pH electrode and instrument has been calibrated before making pH measurements.
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