Calibration and Measurement
I
4
Temperature Compensation
The BI-650 meter is supplied with an industrial conductivity electrode.
When the wires of electrode are connected to the meter, the display
.
will show ATC icon immediately. The meter is now switched to the
.
automatic temperature compensation mode.
Temperature Calibration
During the measurement, if the measured temperature reading differs
from that of an accurate thermometer, the electrode needs to be
calibrated.
1. Place the electrode into a solution with a known accurate
temperature.
2. Press the
° C
key to enter the temperature setting.
3. Press the
/
key to modify the temperature value.
4. Press the
Enter
key to save.
Selecting a Conductivity Electrode
The BI-650 meter is capable of using three types of electrodes. Before
the calibration and measurement, ensure that you have selected a
suitable electrode according to the anticipated sample conductivity.
The following table lists the selectable electrode and its effective
measurement ranges.
Electrode
Measurement Range
Cell Constant
IE-50LT
0.5 to 100 µ S/cm
K = 0.1
IE-50MT
10 µ S/cm to 20 mS/cm
K = 1
IE-50HT
100 µ S/cm to 200 mS/cm
K = 10
Conductivity Calibration
The BI-650 meter allows 1 to 3 points conductivity calibration. For better
accuracy, we recommend to perform 3 points calibration or select a
standard solution closest to the sample conductivity you are measuring.
The meter will automatically detect the standard solution and prompt
the user to perform the calibration. The following table shows the
default standard solution for each measurement range.
Measurement Range
Default Standard Solution
20 to 200 µ S/cm
84 µ S/cm
200 to 2000 µ S/cm
1413 µ S/cm
2 to 20 mS/cm
12.88 mS/cm
20 to 200 mS/cm
111.8 mS/cm
Single Point Calibration
Ensure that you have selected 1 point calibration in the setup menu.
1.1 Press the
Cal
key, the display shows ---
/
, the meter waits
for recognizing the standard solution.
1.2 Rinse the conductivity electrode with distilled water, then rinse
with a small amount of standard solution.
1.3 Place the electrode into the standard solution, the meter will
automatically show the calibration standard (e.g., 1413 µ S/cm).
1.4 Press the
Enter
key, the default calibration value begins flashing.
1.5 Press the
/
key to set the calibration value, press the
Enter
key to confirm and move to next digit. When the setting is
completed, ensure that displayed value matches your calibration
standard.
