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Rev. 1.0 30.01.2020
that moment will be stored.
• Performing Conductivity measurement
• Access the Setup menu for Conductivity to check the calibration and check, and if necessary, update the
reading parameters; press key to return to measure mode.
• Press to scroll through the different screens of parameters until activating the Conductivity
parameter indicated by the icon .
• Connect the Conductivity cell to the BNC for Cond of the instrument (grey).
• If the user does not use a cell with a built-in temperature probe or an external one NTC 30KΩ probe, it
is recommended to manually update the temperature value (MTC).
• Remove the cell from its tube, rinse with distilled water, dab gently taking care not to scratch the
electrodes.
• Dip the sensor in the sample: the measuring cell and any relief holes must be completely immersed.
• Keep slightly stirred and eliminate any air bubbles that would distort the measurement by gently
shaking the sensor.
• Scroll on the display with four red bands means that the measurement is not stable yet.
• Consider the measurement truthful only when the stability icon appears .
• For a highly accurate measurement the instrument uses five different measurement scales and two
units of measurement (µS / cm and mS / cm) depending on the value; the scale change is performed
automatically by the device.
• Once the measurement is finished, wash the cell with distilled water.
• The Conductivity sensor does not require much maintenance; the main aspect is to make sure that the
cell is clean. The sensor must be rinsed with abundant distilled water after each analysis; if it has been
used with water insoluble samples, before performing this operation, clean it by immersing it in ethanol
or acetone.
Never clean it mechanically, this will damage the electrodes compromising the functionality.
For short periods, store the cell in distilled water, while for long periods, keep it dry.
TDS Parameter
COND 7 Vio, PC 7 Vio
• The Conductivity measurement can be converted into the TDS Parameter
• This parameter uses the Conductivity calibration; therefore, refer to the previous paragraph to calibrate
the sensor.
Total Dissolved Solids (TDS) correspond to the total weight of the solids (cations, anions and non-dissociated
substances) in a liter of water. Traditionally, TDS are determined using the gravimetric method, but a simpler
and faster method is to measure Conductivity and convert it to TDS by multiplying it by the TDS conversion
Factor.
• In measure mode press to access the SETUP menu.
• Use the directional keys to move to TDS SETTINGS P4.0 and access the menu by pressing the key
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