horiba LAQUA F-71G, Instruction Manual

Page: 62 / 102

Chapter 3 Basic Operation
3.3 Calibration
44
2.
Open the filler port of the internal solution. During
the calibration, the filler port should be kept open.
3.
Immerse the pH electrode in the standard solution
of pH7 to calibrate the first point.
4.
Press the CAL key to enter the USA calibration
screen.
5.
Check the stable indication value, and press the
CAL key.
The HOLD indicator blinks until the reading
stabilizes. When the reading stabilizes, the HOLD
indicator lights up and the reading is held.
The mark, which means that the pH7
calibration is completed, is displayed on the screen.
・
To stop calibration:
Press the CAL key while the HOLD indicator
blinks.
・
To redo calibration:
Press the CAL key again after the HOLD indicator
lights up.
6.
Wash the pH electrode with pure water (deionized),
and wipe it off by filter paper or tissue paper.
7.
Immerse the pH electrode in the standard solution
of pH4 to calibrate the second point.