21
PH CALIBRATION FOR HI9218 & HI9219
Procedure
•
Turn the instrument ON after connecting the pH
electrode and the temperature probe.
•
Immerse the temperature probe together with
the electrode into pH 7.01 buffer solution or
manually set the temperature to the tempera-
ture of the buffer (if you are not using the
temperature probe
HI7669/2W
see page 25).
Note:
the electrode should be submerged approximately 4 cm (1½")
into the solution. The temperature probe should be positioned
as close to the pH electrode as possible.
•
Shake briefly and then press the CAL button.
The printer will print this step by step procedure
instructions.
At the same time, the pH symbol will flash to indicate calibration is in
progress.
The temperature compensated pH value will be displayed. "Err4"
appears if the electrode is in the wrong buffer.
ON
4 cm
(1½
")
HI 7007
Dip electrode
in the pH 7
solution, wait
for 'YES' to
appear and then
press CFM
CAL
ºC
pH
ºC
pH
°C
°C