Hanna Instruments HI 9017 - Manual (Page 18)

18
IMPORTANT
The instrument's pH range should be re-calibrated:
•
•• •• When the meter is new.
•
•• •• Whenever the pH electrode is replaced.
•
•• •• At least once a month.
•
•• •• After testing aggressive chemicals.
•
•• •• After cleaning procedure and changing the reference electrolyte.
•
•• •• For greatest accuracy.
INITIAL PREPARATION
Pour small quantities (about 4cm / 1½" as level) of pH7.01 (HI7007
or HI8007) and pH4.01 (HI7004 or HI8004) or pH 10.01 (HI7010
or HI8010) solution into clean beakers. If possible use plastic beakers
to minimize any EMC interferences.
If you are measuring in the acid range use pH4.01 as second buffer or
pH 10.01 if you are measuring in the alkaline range.
Note: with HI9017 and HI9318, different pH values can be selected
for calibration purposes. See page 29 and 39 respectively.
For accurate calibration, use two beakers for each buffer solution; the
first for rinsing the electrode, the second for calibration. In this way,
contamination of the buffer is minimized.
PH CALIBRATION FOR HI 9017
Procedure
•
•• •• Switch the instrument on after connecting the
pH electrode and the temperature probe.
PH CALIBRATION PH CALIBRATION PH CALIBRATION PH CALIBRATION PH CALIBRATION
HI 7004 HI 7007
H I 7 0 0 4
HI 7007
CALIBRATION
HI 7007
RINSE
ON