Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 36)

36
There are two options for TDS calibration:
Option 1: Using TDS Standards
The procedure for TDS calibration is almost the same as
the procedure for conductivity calibration. Differences are
as follows:
1. Select the TDS standard for calibration. The default TDS
conversion factor is 0.50. If your solution has a different
TDS factor, you can improve the calibration accuracy by
setting the TDS factor before starting the calibration. To
set the TDS factor for the correct value, refer to the val-
ue provided by the standard solution manufacturer or
see Appendix A (page 61).
2. In Measurement Mode, press MODE to select TDS and
press CAL to enter Calibration Mode.
Option 2: Using Conversion Factors
TDS values are related to conductivity. You can calibrate
the meter by using the conductivity standards above and
then program the meter with a given conversion factor.
1. Perform the conductivity calibration procedure (page
31).
2. Select the correct conductivity-to-TDS conversion factor.
Refer to Appendix A (page 61) or calculate the TDS
conversion factor for other solutions using the formula
shown in Appendix B (page 61).
3. Refer to P5.4 (page 24) for the procedure to set the TDS
conversion factor.
TDS CALIBRATION