Apera EC60 - Conductivity Measurement Process; Measurement Execution Steps; TDS and Salinity Conversion Explained; Calibration Standards and Points

5
5. Conductivity Measurement
Press key to turn on the tester. Rinse the probe in distilled water and dry it.
Dip the probe in sample solution, stir gently, and allow it to stand still in the solution until a stable
reading is reached. Get readings after comes up and stays. Press to switch from
Conductivity to TDS, and Salinity
■ Notes
a) The TDS and Salinity measurements are converted from the conductivity
measurements via a certain conversion factor.
b) The tester can calibrate 84μS, 1413 μS/cm and 12.88 mS/cm 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 - 200 μS/cm
1413 μS/cm
200 - 2000 μS/cm
12.88 mS/cm
2 - 20 mS/cm
5.1 The tester has been calibrated before leaving the factory. Generally, users can use the tester
directly or users can test conductivity buffer solutions first. If the error is large, then calibration is
needed.
5.2 For conductivity calibration solutions, we recommend that users replace new 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.
5.3 Temperature compensation factor: The default setting of the temp. compensation factor is
2.0%/℃. User can adjust the factor based on test solution and experimental data in parameter
setting P4.
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