Hanna Instruments HI 9910 - Manual (Page 21)

21
4c
m (1
½
")
HI 7004
COARSE FINE SLOPE OFFSET
SET POINT
pH
4.01
as that on the Checktemp and make sure the selector is in the
MTC position (see 17 - Functional Diagram).
• Wait for the measurement to stabilize and then adjust the
"OFFSET" trimmer to display pH
7.01 on the LCD if the tempera-
ture of the buffer solution is at
25
°C (77°F).
• If the temperature of the buffer
solution is not 25 °C (77°F),
refer to the chart at the end of the manual for the appropriate
buffer value at a given temperature and adjust the trimmer
accordingly.
SLOPE ADJUSTMENT:
• Rinse the electrode (and ground probe)
thoroughly with water and immerse the
bottom 4 cm (1.5”) in a pH 4.01
(
HI 7004) or a pH 10.01 (HI 7010)
buffer solution.
Note: Use pH 4.01 if you are going to be monitoring acidic solutions
or pH 10.01 for alkaline samples.
• Stir the electrode and wait for the display to stabilize before
adjusting the "SLOPE" trimmer to display pH 4.01 (or 10.01) on
the LCD if the temperature of the buffer solution is at 25
°C
(77 °F). Other-
wise, refer to the
chart at the end
of the manual
for the appropri-
ate buffer value
and adjust the
trimmer accord-
ingly.
The pH calibration is now complete.
COARSE FINE SLOPE OFFSET
SET POINT
pH
7.01