37
• 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 Po-
tential Matching Pin (#5 page 7) with the Connection for
Electrode Reference (#6 on 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 read-
ing 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 se-
lected 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.
