NAVI F-52, Instruction Manual

Page: 253 / 270

Chapter 16 Reference
16.4 Conductivity measuring
240 HORIBA
●
Calibration of cell constant
As for the cell constant of the electrode, an officially approved value is specified in the elec-
trode label. However, it may change according to the using condition, and in such cases, it is
preferable to perform the calibration of the cell constant. Follow the following procedures for
the calibration.
1.
Wash the electrode a few times in the ion exchange water, wash it with potas-
sium chloride standard solution (KCl 0.01 mol/L) a few times, and then
immerse it into potassium chloride standard solution (KCl 0.01 mol/L) so that
no bubble remains inside the cell.
At this time, keep the temperature of the potassium chloride standard solution constant at 25
±
0.5
℃
.
2.
Press the CALkey in the COND instant value measurement screen to open the
CAL screen.
3.
Press the MODE key in the cell constant input screen of the COND calibration
screen to open the cell constant calibration screen.
4.
Input the conductivity value of the standard solution by pressing the
↑ ↓
key
and then press the CAL key . Start calibration and the obtained cell constant is
set after the calibration is complete.
5.
After calibration is complete, press the MEAS key to return to the COND Mea-
surement screen.
During the calibration, keep the standard solution constant at 25
±
0.5
℃
by using the temper-
ature controlled bath, etc. Immerse the electrode to the sufficient depth into the standard solu-
tion, and slowly stir the solution with stirrer, etc.
Abandon the used standard solution, not returning it to the former container.
Blinking