A151 Benchtop Conductivity Meter
11
Selecting the Conductivity Electrode
The A151 conductivity meter is capable of using the 3 types of 2-pole 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 electrodes 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
If the 4-pole conductivity electrode is selected, its best measurement range is 100µ S/cm to 200mS/cm.
Conductivity Calibration
The meter allows 1 to 3 points calibration in the conductivity 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
Ensure that the meter is in the conductivity measurement mode and 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 “Calibration Point
1
”
and waits for recognizing the standard solution.
