DDS-12DW Benchtop Conductivity Meter
9
Selecting the Conductivity Electrode
The DDS-12DW conductivity meter is capable of using the 3 types of conductivity electrodes. Prior to the calibration and measurement, you need to select
the different sensors as per your sample concentration. The table below shows available electrode and its effective measuring ranges.
CONDUCTIVITY ELECTRODE
MEASURING RANGES
CELL CONSTANT
CON-0.1
0.1~100µ S/cm
K=0.1
CON-1
10µ S/cm~10mS/cm
K=1
CON-10
100µ S/cm~200mS/cm
K=10
Automatic Calibration
Make sure that you selected the cell constant between 0.1, 1 or 10 in the setup menu. If the current option is “USER”, the au
tomatic calibration function will
be disabled (Refer to chapter SETUP MENU).
The meter allows 1 to 3 points calibration in the automatic calibration mode.
To ensure higher accuracy, we recommend that you perform 3 points calibration
or select a standard value close to the sample value you are measuring. The meter will automatically detect these conductivity standard solutions and
prompt the user to calibrate the meter. When the calibration is completed, all new calibration values will automatically override existing data.
The following table shows acceptable conductivity range of standard solution for each measuring range.
MEASURING RANGE
CALIBRATION SOLUTION RANGE
DEFAULT
0~20µ S/cm
7~17µ S/cm
10µ S/cm
20~200µ S/cm
70~170µ S/cm
84µ S/cm
200~2000µ S/cm
700~1700µ S/cm
1413µ S/cm
2~20mS/cm
7~17mS/cm
12.88mS/cm
20~200mS/cm
70~170mS/cm
111.8mS/cm
Single point calibration
1.1
Make sure that you have selected 1 point calibration in the setup menu.
1.2
Rinse the conductivity electrode with distilled water, then rinse with a small amount of standard solution.
1.3
Press the
Cal
key, the display shows “CAL1” and waits for recognizing the standard solution.
