Chapter 3 pH MEASUREMENT
3.4 Calibration Setting
F-52, 53, 54, 55 51
③ Calibrated value
Calibrated value for each standard solution
of pH7, 4, and 9, potential, and
temperature.
④ Average value for pH9
Average of the three-time measurement with
standard solution of pH9
⑤ Asymmetric potential
Within regulated values ± 30 mV
⑥ Sensitivity
pH4-7(90% to 105% of regulated value)
pH7-9(90 % to 105% of regulated value)
⑦ Repeatability
The repeatability shows the difference
between maximum and minimum of the indi
-
cation given by three times of measurements
using the standard solution of pH9
(See the values ③ , ④ , and ⑤ above).
⑧ Linearity
Regulation (Within ± 0.03pH)
This is equivalent to “0” and “I” in JIS.
The linearity shows the difference from the
average values of three times using the stan
-
dard solution of pH9, which is obtained by
the measurement of solutions of pH7 and
pH4.
OK (0)
Within ± 0.005 pH
Equivalent to 0 in JIS
OK (1)
Within ± 0.02 pH
Equivalent to I in JIS
OK (2)
Within ± 0.05 pH
Equivalent to II in JIS
CHECK
Over ± 0.05 pH −
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