Hanna Instruments HI 9910 - Manual (Page 20)

20
SET
READ
4c
m (1½")
HI 7007
Temp. compensation
selector
ATC MTC
MTC
°C
-10 80
10
0
30
20
60
70
40
50
Make sure that the pH electrode and any ground probe have been
properly connected and wired to the controller (see preceding pages)
and that the meter is plugged to the mains.
Calibration should be ideally performed at a temperature similar to
that of the liquid to be monitored.
Use a Checktemp (or an accurate thermometer)
as reference for temperature compensation.
Remove the electrode cap if it is still on the
electrode.
During calibration, move the electrode and the
separate ground probe (if in use) together from
one buffer to the next.
If no separate ground probe is being used, make sure
that the Reference and the Matching Pin terminals are
shorted (see 14 - Functional Diagram).
If the electrode incorporates a ground probe/matching pin (HI 1003/3)
then remove the jumper.
• Turn the switch to the "READ" position.
OFFSET ADJUSTMENT:
• Rinse the tip of the electrode with pH
7.01 solution ( HI 7007), then dip the
bottom 4 cm (1.5”) of the electrode (and
ground probe) in the pH 7.01 buffer.
• Place the Checktemp thermometer in the buffer solution. Turn the
dial (see 10 - Functional Diagram) to show the same temperature
pH pH pH pH pH CALIBRATION CALIBRATION CALIBRATION CALIBRATION CALIBRATION
(HI 9910 and HI 9911)
4c
m (1
½
")
HI 7007
4c
m (1
½
")
HI 7007