NAVI D-25, Instruction Manual

Page: 43 / 227

2 Taking Measurements
2.5 Measuring pH
32 HORIBA
●
pH repeatability check
The repeatability of the calibration can be checked if the
calibration has been performed with pH 7 standard
solution of NIST or US.
The repeatability check is operable only once after
calibration.
1.
After calibration and while still in the Calibration
mode, immerse the electrode in pH 7 standard
solution and press the ENTER key.
The difference between the calibrated value and
measured value is displayed.
There is no problem in measurement accuracy if the
difference is within
±
0.05 pH.
●
Clearing calibrated values
To clear all the calibrated values:
1.
Set the pH meter to the Calibration mode.
2.
Press the CAL key while holding the SET key
down.