Operational Guide
31
When a pH electrode is connected, the instrument
will recognize it and the “REMOVE PROTECTIVE
AND FILLING CAPS” message will be displayed along
with “PH”. Press any key to skip the message. The
instrument will enter measurement mode. Make
sure the electrode has been calibrated before taking
measurements.
Rinse the pH sensor with water and a sample if
possible. Submerse the electrode tip approximately 3
cm (1¼”) into the sample to be tested and stir sample
gently. Allow time for the electrode to stabilize.
The pH is displayed on the fi rst LCD line and the temperature on the second LCD
line. Using the ARROWS, date, time, battery status and off set with slope can be
displayed on the third LCD line. If the reading is out of measurement range, the
closest full scale value will be displayed blinking on the fi rst LCD line.
If measurements are taken successively in diff erent samples, it is recommended
to rinse the electrode thoroughly with deionized water or tap water and then
with some of the next sample to prevent cross-contamination. The pH reading is
aff ected by temperature. The temperature eff ect is compensated for using the
temperature sensor inside the probe. The resulting measurement is the actual
pH at the temperature of measurement.
Error Messages During Measurement
If the pH or temperature exceeds the limits of the
sensor, the message “ELECTRODE OUT OF SPEC”
will scroll on the third LCD line. The temperature will
continue to be displayed. If temperature exceeds the
meter specifi cation of 120º C, then “120º C” will blink
on the display. If interval logging, the message “OUT
OF SPEC.” will alternate with the LOG specifi c message
in both these cases and the Log fi le will indicate a “ºC!”
next to the data.
In case the temperature sensor is damaged, “BROKEN
TEMPERATURE SENSOR” will be displayed and the
temperature will display “25.0” and the unit tag
blinking on the second LCD line. The Log fi le will
indicate “ºC!!” next to the data.
mV Reading Of The pH
The mV reading of the measured pH can be displayed
on the LCD by pressing the RANGE key.
pH
Measurement
