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7.6.2
Relationship among TDS, salinity and conductivity
The conversion
coefficient between TDS and conductivity is 0.40~1.00 which can be adjusted in
parameter setting clause 2.6. Factory default setting is 0.71.
The conversion
coefficient between salinity
and conductivity is 0.5. So the meter only needs to be calibrated in conductivity mode, then switch to
TDS and salinity mode. Customers can adjust TDS conversion coefficient in parameter setting 2.6
according to testing data and experience. Please refer to chart-9 for some frequently-used conductivity
and TDS conversion coefficients.
Chart -9 Conversion coefficient between conductivity and TDS
Conductivity of solution
TDS conversion coefficient
0~100 μS/cm
0.60
100~1000 μS/cm
0.71
1~10 mS/cm
0.81
10~100 mS/cm
0.94
7.6.3
Restore to factory default setting
Instrument has a factory default setting function, please
refer to parameter setting clause 2.7 (see Diagram-11).With
this function, all calibration data is deleted and the meter will
be calibrated to the theory value. Some function settings
restore to the original value (refer to clause 2.7). When
calibration or measurement fails, please restore the meter to
factory default setting and then perform re-calibration or
measurement. Please note all the data deleted will not be
retrievable if the meter is restored to factory default setting.
7.7
Conductivity probe maintenance
7.7.1 Always keep the conductivity probe clean. Before taking a measurement, rinse the probe in
purified water and allow it dry, then rinse it in the sample solution. When submerge the probe in
solution, stir the solution briefly to eliminate air bubbles and allow it to stay in the solution until a
stable reading is reached.
7.7.2 The sensitive rod of Model 2301T-F conductivity probe is coated with platinum black to
minimize probe polarization and expand measuring range. The platinum black coating of the probe
adopts advanced electroplating technology. This not only increases the surface roughness, but
also improves probe measurement performance. And the coating is tight and firm, it can be
washed by a soft brush. This significantly increases the the service life of probe.
Diagram-11
