First, the calibration of the conductance constant of the conductivity meter
1. Â Turn on the power;
2. Â Washing the water electrode with distilled water or deionized water;
3.  Prepare a calibration solution of 0.01 mol/L KCL solution ( KCL of 0.7440 g per L solution at 20 ° C );
4. Â Connect the conductance to the conductivity meter;
5. Â Immerse the electrode in the calibration solution;
6.  Press the “electrode constant†button to select the 1.0 electrode constant and press the “confirm†button. At this time, the small digit at the bottom of the screen flashes. Adjust the “elevation†button to set the actual electrode constant. Press “Confirm†to stabilize and observe whether the conductivity value is 1408.3 μ s/. The cm is consistent, otherwise the small number is re-adjusted until it matches the conductivity value of the calibration solution.
7. Â After calibration, the electrode was rinsed with distilled water and deionized water, and blotted dry with filter paper.
Second, the determination of conductivity value
1. Â Turn on the power and the instrument enters the measurement state;
2.  Press the “electrode constant†button to select the appropriate electrode constant among the four electrode constants of 1.0, 10.0, 0.1, and 0.01, and press the “confirm†button. At this time, the small number below flashes. Press the “lift†button to set the actual electrode constant. Calibrate the electrode constants and press the "confirm" button;
3. Â When the instrument is in the measuring state, the cleaned electrode is rinsed with the solution to be tested, and then the electrode is immersed in the solution, and the value displayed is the conductivity value of the tested solution;
4. Â If you need to measure TDS, press the "Conductivity / TDS" switch button.
5. Â After the measurement, rinse the electrode with distilled or deionized water and blot dry with filter paper.
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