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10. PROBE MODE
10.1. pH MEASUREMENT
The
HI83325
can be used to perform direct pH measurements by connecting a Hanna Instruments
digital pH electrode with a 3.5 mm TRRS connector. Connect the electrode to the 3.5 mm port marked
with EXT PROBE located at the rear of the meter. If the meter is in Photometer mode, set the meter to
Probe mode by pressing the MODE key.
Press Calibrate to open the calibration window.
Press GLP to review the calibration information.
Press Range to switch between pH and mV.
For high accuracy it is recommended to calibrate your electrode often. pH electrodes should be
recalibrated at least once per week, but daily calibration is recommended. Always recalibrate after
cleaning an electrode, see pH CALIBRATION section for more information.
To take pH measurements:
• Remove the protective cap and rinse the electrode with water.
• Collect some sample in a clean, dry beaker.
• Preferably, rinse the electrode with a small amount of sample.
• Submerse the electrode tip approximately 3 cm (1¼") into the sample to be tested and stir the
sample gently. Make sure the electrode junction is completely submersed.
• Allow time for the electrode to stabilize in the sample. When the
reading is stable.
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.
pH measurements are affected by temperature. Hanna Instruments
a built-in temperature sensor and automatically calculate corrected pH values. The measured
temperature is displayed on the screen with the pH measurements.
symbol disappears, your
®
digital pH electrodes include
®
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