C931 • C932 • C933 9 / 47
Conductivity measurement
Measurement:
1. Select [S/cm] by pressing MODE. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press CAL.
2. The display shows the three standards in memory. Select the proper values or
enter manually special values and press CAL. The unused standards should be
switched off. Also select the temperature to which all future measurements
will be referred to.
3. After rinsing the electrode several times with the first standard solution,
immerse it in that standard. The solution temperature is not so critical but
should lie between 0°C and 30°C. When no Pt1000 is used, do not forget to
compensate manually first! Select [CALIBRATE], press CAL and follow the
instructions on the screen until the calibration is finished.
4. Rinse the electrode several times with the sample, immerse it in that solution
and read the display.
5. Rinse the electrode always after use and store it in distilled water (add some
detergent to keep the spongy platinum surface in perfect condition).
• A blinking decimal point warns you for unstable measurements. Wait to read
the display!
• Stirring the solution during the measurements promotes the homogeneity and
is obligatory!
• The instrument will refuse automatic standardisation when the electrode is
unstable. Insufficient stirring or a worn electrode may be the cause.
• When starting a titration, press Ú to lock the actual range and avoid cross-over
errors due to differences in the measuring frequency. Press MODE to return to
the normal measuring mode.
Reference temperature:
1. Select the temperature to which all future measurements will be referred to
and press CAL.
Capacitive compensation:
1. Capacitive compensation increases accuracy in the very low conductivity
ranges (<10 µS/cm). Select whether this compensation should be applied or
not. Verify if the attached electrode is completely dry and press CAL. Select
[COMP.ON] or [COMP.OFF] and press CAL. Follow the instructions on the
screen.
Resistivity measurement
1. Select [Ω.cm] by pressing MODE. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press CAL. Proceed as for conductivity.
Salinity measurement
1. Select [SAL] by pressing MODE. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press CAL. Proceed as for conductivity.
TDS measurement
1. Select [TDS] by pressing MODE. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press CAL. Proceed as for conductivity.
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