Jis Mode - Horiba Scientific LAQUA F-73A-S Instruction Manual

8.1.2 JIS Mode

According to JIS regulation, the measurement with a solution of pH9 is given three times
after measurement by standard solutions of pH7 and pH4. The result is displayed on the
screen. When the periodic inspection mode starts, the operation guide is shown on the
screen.
Perform measurement by the standard solutions in the following order.
(1) pH6.865
(2) pH4.008
(3) pH9.180
(4) pH9.180
(5) pH9.180
Cautionary points
・ Wash the electrode with pure water before each measurement.
・ Keep the temperature gap during the measurement within 0.2C.
・ The measurement values during the periodical check are displayed according to those
when the calibration is cleared.
When the measurement and check is completed, the result data is displayed.
Result data output
(1) Judgment
OK: The result data satisfies the regulation
CHECK: The result data does not satisfy the regulation
(2) Calibrated value
Calibrated value for each standard solution of pH7, 4, and 9, potential, and tempera-
ture.
(3) Average value for pH9
Average of the three-time measurement with standard solution of pH9.
(4) Asymmetric potential
Within regulated values ±30 mV
(5) Sensitivity
pH4 to pH7 (90% to 105% of regulated value)
pH7 to pH9 (90% to 105% of regulated value)
84
1.
Immerse the pH electrode in the standard
solution, and tap
2.
Perform measurement of each standard solution
in accordance with the content displayed on the
bottom of the screen.
to start measurement.