Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 19)

Instruction Manual PC 300
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4.6 Calibration with Conductivity Standard and TDS factor
The concentration of salts dissolved in solution increases the conductivity of that solution. This
relationship varies from salt to salt and is roughly linear over a given range for a given salt.
The TDS conversion factor is the number used by the meter to convert from conductivity to
TDS.
Instead of calibrating for TDS directly (described above), you can calibrate the PC 300 meter
by:
1. calibrating to conductivity standards (as described above) and then
2. entering the appropriate TDS conversion factor into the meter.
To determine the conductivity to TDS conversion factor for your solution:
• Addendum 1 lists some commonly used conversion factors.
• Addendum 2 describes how to calculate the TDS conversion factor for other
solutions.
Enter the TDS conversion factor into your meter as described under Section 7.5, in P7.4
Setting the TDS Factor.