33
32
•
Press RANGE to display pH measurement.
• Press CAL to start calibration and to display again the last
calibration date.
Note:
if changing the calibration date is not desired, simply press the
CFM key twice to bypass the month and day entry.
• Using the UP and DOWN keys, enter the month while the
"month" symbol and the two left digits blink.
• Press CFM.
• The "day" symbol and the two right digits will start blinking.
Using the UP and DOWN keys, enter the day.
• Press CFM to enter the new calibration date. The meter will
request pH 7.01 buffer value and the display will show:
If "Er-7" appears, the calibration solution is
wrong or is out of specifications and needs
to be replaced.
• When "CAL" disappears and the meter
displays "CFM", press CFM to confirm the
offset calibration.
RANGE
CAL
CAL
month
day
CAL
month
day
CFM
CAL
month
day
pH
CAL
CFM
pH
CAL
CFM
• If the ON/OFF key is pressed at this point, the calibration process
will end with only the offset (one-point) calibration. For best
accuracy, however, it is recommended that a two-point calibra-
tion is performed.
• The LCD will now blink "4.01
∆
". pH 10.01
can be selected by pressing the CAL key.
• Rinse with pH 4.01 (or pH 10.01) buffer
solution (2
nd
calibration point).
• Dip the electrode into a pH 4.01 (or
pH 10.01) buffer solution.
• Stir gently and wait until the stability
indicator "
∆
" stops flashing.
• Press CFM to confirm the second buffer
solution.
The meter is now calibrated and will return to
operational mode.
PROCEDURE FOR HI 9622
• Switch the meter on after connecting the pH electrode and the
temperature probe and the meter will display the previous
calibration date (month & day) for 3 seconds.
• Remove the protective cap from the elec-
trode, rinse the tip of the electrode with
some pH 7.01 solution, then immerse the
pH electrode and temperature probe into
the pH 7.01 buffer solution; stir gently
and wait a couple of minutes for thermal
equilibrium.
Note:
the electrode should be submerged ap-
proximately 4 cm (1½") into the solution.
The temperature probe should be close
to the pH electrode.
HI 7004
∆
CFM
CAL
month
day
HI 7007
ON
OFF
4 cm
(1
½
")
∆
