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MEASUREMENT
12. MEASUREMENT
12.1. pH MEASUREMENT
To take a pH measurement remove the electrode protective cap and simply submerge the tip of the
electrode (4 cm/1½”) into the sample to be tested.
Press
RANGE
key until the display changes to the pH range, if necessary.
Press
MODE
key to select the pH resolution.
Allow for the electrode to adjust and reading to stabilize (stability indicator not displayed).
On the pH screen are displayed:
• pH reading with the selected resolution
• temperature reading in the selected unit (°C or °F)
• temperature compensation mode (MTC - manual, ATC - automatic)
While in MTC mode the indicates that the temperature can be manually changed using /
keys.
• electrode condition on calibration day
• buffers used for previous calibration (if enabled)
• battery level indicator
• available functional keys
For accurate pH measurements, make sure that the instrument is calibrated (see pH CALIBRATION
section for details).
It is recommended that the electrode is always kept moist and rinsed thoroughly with the sample to
be measured before use.
The pH reading is directly affected by temperature. For accurate pH measurements, temperature must
be taken into consideration. If the sample temperature is different from the temperature at which the
pH electrode was kept, allow a few minutes to reach thermal equilibrium.
To use the instrument’s Automatic Temperature Compensation (ATC) feature, submerge the temperature
probe into the sample as close to the electrode as possible and wait for a few seconds.