Thermo Fisher Scientific CyberScan CON 10/CON 100/CON 200 User Manual

Page 18

TDS calibration: Method 1

Select the TDS standard solution with a value that

is closest to the measurements expected in the

sample (in this manual, the KCI standard solution

1413

S is about 706.5 ppm).

Check this number by multiplying the conductivity

reading by the factor and the result should be the

TDS in equivalent units.

First, pour enough of the selected sample into two

separate clean containers so as to allow the

probe to be immersed up to the bleed hole.

3. Rinse the end of the probe into one of the

containers by gently stirring it in the standard

solution. This helps remove contaminants that

offset the calibration and introduce error.

4. Dip the rinsed probe into the other container

containing the unused solution.

5. Allow the probe some time to stabilize to the

solution temperature.

Select the TDS mode using the MODE key. Note

the temperature of the calibration solution and

find the corresponding TDS value of the

calibrating solution at that temperature.

For example, the meter displays the temperature

of 27

C, and a TDS value of 720 ppm (when

normalized to 25

C) with the uncompensated

value at 27

C should be 733 ppm.

7. Upon pressing the CAL/MEAS key, the CAL

annunciator on the screen will blink, indicating the

calibration mode is on. The LCD displays the

uncompensated TDS value.

Figure 14: TDS calibration

procedure Method 1