- 6 -
5)
After calibration, place the probe in 12.88 mS/cm conductivity calibration solution. If the value is
accurate, it is not necessary to conduct 2
nd
point calibration. If it is inaccurate, follow the steps in 3) to 4)
to complete the 2
nd
point of calibration using 12.88 mS/cm calibration solution.
Notes
1)
TDS, salinity, and resistivity values are converted from conductivity. So only conductivity needs
to be calibrated.
2)
The tester can calibrate 1413
μS/cm, 12.88 mS/cm, and 84 μS/cm(sold separately)
conductivity calibration solution. User can conduct 1 to 3 points calibration. Refer to the table
below. Usually calibrating the tester with 1413
μS/cm conductivity buffer solution alone shall
meet the testing requirement.
Calibration Indication Icon
Calibration Standards
Measuring Range
84 μS/cm
0 - 199 μS/cm
1413 μS/cm
200 - 1999 μS/cm
12.88 mS/cm
2.0 – 20.00 mS/cm
3)
The tester has been calibrated before leaving factory. Generally, users can use the tester
directly or users can test conductivity calibration solutions first. If the error is large, then
calibration is needed.
4)
Conductivity calibration solutions are easier to get polluted than pH buffers, we recommend
that users replace new conductivity solutions after 5 to 10 times of use to keep the standard
solution’s accuracy. Do NOT pour the used calibration solutions back into the solution bottles
in case of contamination.
5)
Temperature compensation factor: The default setting of the temperature compensation factor
is 2.0%/
℃
. User can adjust the factor based on test solution and experimental data in
parameter setting P10.
Solution
Temperature
compensation factor
Solution
Temperature
compensation factor
NaCl
2.12%/˚C
10% Hydrochloric acid
1.32%/˚C
5% NaOH
1.72%/˚C
5% Sulfuric acid
0.96%/˚C
Dilute ammonia
1.88%/˚C
6)
*1000
μS/cm =1mS/cm; 1000 ppm = 1 ppt
7)
TDS and conductivity is linear related, and its conversion factor is 0.40-1.00. Adjust the factor
in parameter setting P13 based on the requirements in different industries. The factory default
setting is 0.71. Salinity and conductivity is linear related, and its conversion factor is 0.5. The
tester only needs to be calibrated in Conductivity mode, then after calibration of conductivity,
the meter can switch from conductivity to TDS or salinity.
8)
Conversion Example
if conductivity measurement is 1000µS/cm, then the default TDS measurement will be 710
ppm (under the default 0.71 conversion factor), and the salinity be 0.5 ppt.
9)
For the self-diagnosis information, please refer to the table below:
