11
OPERATIONAL GUIDE
• 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
indicate that the temperature can be manually changed using / keys.
• Electrode condition during the calibration day.
• The buffers used in last pH calibration (if feature is enabled in SETUP).
• Battery level indicator.
• Available functional keys in accordance with the model.
In order to take more accurate pH measurements, make sure that the instrument is calibrated
(see page 14 for calibration 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.
If manual temperature compensation (MTC) is desired, the temperature probe must be
disconnected from the instrument (HI98191 only).
The display will show the default temperature of 25 °C, the last measured temperature reading, or
the last set temperature, with the “MTC” indication.
The “MTC” indication and the symbol light up on the LCD to indicate that the instrument is in MTC
mode and the / keys can be used to enter the desired temperature value.
Note: When in MTC the user can press and hold the / keys, and the instrument will
start incrementing /decrementing the temperature value. The instrument keeps measuring
and the display is updated periodically.
On the pH screen are displayed:
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