6.4 TDS & Conductivity
6.4.1. TDS and conductivity is linear related. The conversion factor is 0.40-1.00. Adjust the factor from
parameter P2.6. The factory default setting is 0.71 and please refer to section 7.4. The meter only needs
to be calibrated in Conductivity mode, then after calibration of conductivity, the meter can switch from
conductivity to TDS.
6.4.2. Adjust TDS conversion factor in parameter setting P2.7 according to the data collected during testing
and experience. Table – 10 lists some commonly used Conductivity and TDS conversion factors. This is
for your reference only.
Table – 10 Conductivity and TDS conversion factors
6.5 Sample test
6.5.1. Rinse conductivity electrode in distilled water, dry it, and dip it in the sample solution. Stir the solution
briefly and allow it to stay in the sample solution until a stable reading is reached and icon appears
on LCD, then get the reading value, which is the conductivity value of the solution.
6.5.2. Press key to switch to TDS.
6.5.3. During the process of calibration and measurement, the meter has self-diagnosis functions,
indicating the relative information as below: Table – 11.
Table – 11 Self-diagnosis information of conductivity measurement mode
Wrong conductivity calibration
solution or the meter recognition of
calibration solution out of range.
1. Check whether conductivity calibration
solution is correct.
2. Check whether the meter connects the
electrode well.
3. Check whether the electrode is damaged.
During calibration, the measuring
value being unstable for over 3
minutes.
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