26
CONDUCTIVITY PROBE CALIBRATION
Selecting Calibration Schedule
For first use and best results, use solution to calibrate.
If the conductivity of the measured solution is < 100 µS or the TDS is
< 50 ppm, calibrate the meter weekly to achieve the specified accuracy.
If the meter is used in the mid ranges, calibrate the unit monthly.
If the measurement is performed at extreme temperatures, calibrate the
unit weekly.
To Calibrate:
1. Insert the probe into deionized or distilled water for about 30 minutes
to rinse the probe.
2. Select the conductivity standard for calibration. (Refer to page 25.)
3. Pour 4 cm (deep) of buffer solution into two separate containers (A & B).
4. Rinse the probe in one of the containers. Gently stir the probe.
5. Dip the rinsed probe into the other container. Tap the probe on the
bottom of the container to remove air bubbles. Let the probe stabilize
to the solution temperature.
6. Turn the meter
on
. In Normal Mode, press
MODE
continuously to
select the mode as CON.
7. Press
CAL
to enter Calibration Mode. The probe automatically detects
the conductivity value of the solution. The value will flash on the LCD.
8. Wait for the measured conductivity value to stabilize. If you have
enabled the Ready function in P6.0, the ready icon will appear on the
upper left corner of the LCD when the calibration is stable.
A (Step 4) B (Step 5)