YOKOGAWA PH71, User Manual

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IM 12B03D01-01E
4-4
4. Calibration
d
Procedure
Example 1: 2-point calibration using pH 7 and pH 4 standard solutions
F0401.EPS
POWER
CAL
CAL
Auto calibration in progress
(1st point)
Auto calibration at 1st point
is complete
F/ENT
Auto calibration in progress
(2nd point)
Auto calibration at 2nd point
is complete
Calibration
at 2nd point
F/ENT
Std. sol.
Water
Wash sensor with water
thoroughly (or wash in
water in beaker).
Wait until
reading
stabilizes.
Wipe off washing water
from sensor thoroughly
and then immerse sensor
in standard solution.
Std. sol.
Water
Wash sensor with
water thoroughly.
Wait until
reading
stabilizes.
Wipe off washing water
from sensor thoroughly
and then immerse sensor
in standard solution.
to select auto calibration (AUto)
After
a few
seconds
After
a few
seconds
( to select auto calibration (AUto))
The last two calibration results are saved in the meter. Therefore, for 1-point calibration,
perform a 1-point calibration twice using the same standard solution, or initialize
calibration parameters (refer to Section 5.3 (10), “Initialize calibration parameters (I.CP)
panel”) before performing a 1-point calibration.