23
PH CALIBRATION FOR HI9318
Procedure
•
••
•• Switch the instrument on after connecting the
electrode and temperature probe.
•
••
•• Immerse the pH electrode and the ATC probe
into pH 7.01 buffer solution. Shake briefly and
wait 1-2 minutes for thermal equilibrium.
Note:
the electrode should be submerged approxi-
mately 4 cm (1½") into the solution. The temperature probe
should be positioned as close to the pH electrode as possible.
•
••
•• Press the CAL key.
The printer will then print
step by step instructions for
the calibration procedure.
At the same time, the pH symbol will flash to indicate that
calibration is in progress. The pH value at the measured (or
manually) adjusted temperature will be displayed (see page 26).
If "Err4" appears on the display it means the electrode is in the
wrong buffer. Check to make sure that the electrode is in the pH
7.01 beaker and wait for the "Err4" to disappear.
•
••
•• After approximately 30 seconds, press the CON key to confirm the
calibration.
The printer will print further instructions for the calibration procedure.
CAL
ON
4 cm
(1½
")
HI 7007
Dip the electro-
de in the pH 7
solution; wait
30 sec and then
press CON
ºC
pH
ºC
pH
°C
°C
Now dip the e-
lectrode in 2nd
solution, wait
30 sec and then
press CON
CON