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• Remove the protective cap from the pH
electrode and immerse it into the selected
buffer solution (e.g. pH7.01) with the
Potential Matching Pin and temperature
probe, then stir gently.
Note
The electrode should be submerged ap-
proximately 4 cm (1½”) in the solution. The
temperature probe should be located as
close as possible to the pH electrode.
Note
When it is not possible to immerse the Potential Matching
Pin together with the pH electrode in the solution, disable
the differential input by connecting the Connection for
Potential Matching Pin (#9 at page 7) with the Connection
for Electrode Reference (#8 at page 7) with a jumper wire.
• Only when the reading is stable the
probe indicator “ “ will stop
flashing (after about 30 seconds)
and the “CFM” indicator will start
blinking.
• Press CFM to confirm the calibration; if the reading is close
to the selected buffer (±1.5 pH), the meter stores the reading
and the secondary LCD will display the expected second
buffer value. Offset and slope calculation is made at the
end by pressing CAL to exit.
If the reading is not close to the
selected buffer, “WRONG “ will
blink.
• If CAL is pressed, the calibration
process ends by memorizing a new
offset value. The new offset value
is stored and a default value of
57.5 mV per pH unit at 25 °C is
assigned as the new slope value.
For best accuracy however, it is recommended that a two-
point calibration is performed.
