IM 12B03D02-01E
4-5
4
.
Calibration
Note:
Although manual calibration can be performed using standard solutions the same as
the ones preprogrammed for automatic calibration, it only makes the procedure more
complicated. When using these standard solutions, automatic calibration should be
generally performed.
l
Precautions
(1) The difference between the pH values of two standard solutions to be used for
2-point calibration must be at least 0.7 pH. If not, the meter will recognize the two
standard solutions as the same calibration point. That is, the second calibration
result will override the first calibration value, resulting in 1-point calibration.
(2) When using alkaline standard solutions, use the standard solution with lower pH
for the first point calibration. If not,
may appear.
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Procedure
Example 3: Manual calibration
F0403.ai
POWER
CAL
Prompting
F/ENT
F/ENT
Manual calibration is complete
(2-point calibration)
F/ENT
Std. sol.
Water
Wait until
reading
stabilizes.
Wipe off washing water
from sensor thoroughly
and then immerse sensor
in standard solution.
to enter
to confirm
to select
manual
calibration
(MAn)
Wash sensor with water
thoroughly (or wash in
water in beaker).
