Thermo Fisher Scientific CyberScan CON 10/CON 100/CON 200 - Manual (Page 20)

17
TDS calibration: Method 2 (for CyberScan CON 200 only)
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
µ
S is about 706.5 ppm at 25
°
C).
2. Pour about 3 cm of the selected sample into two
separate clean containers.
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 buffer solution.
5. If the Eutech standard solution is used, the correct
Conductivity-to-TDS conversion factors are given
for KCI, NaCI & 442 natural water formulation at
25
°
C under the “Multiply By:” on the label. If
another brand of TDS calibration is used, refer to
the formula:
Factor =
TDS
Conductivity
@ 25
°
C
Select the correct factor according to the protocol
of the method, or that is closest to the solution to
be measured.
6. Enter into the SETUP mode by pressing the SET
key (note that this mode can be entered only from
the MEAS mode).
Press the ENTER/RANGE key repeatedly until Program 3.0 (TDS factor) is shown.
Figure 15: TDS calibration
procedure Method 2
Press ENTER key
repeatedly until you
come to P3.0.