Performing Conductivity Measurement - Dostmann pH 7 Vio Manuel D'utilisation

Note: If you are not aware of the exact compensation coefficient, to obtain an accurate
calibration and measurement set in P3.4
exactly to the reference temperature.
Another method of working without temperature compensation is to use the appropriate thermal tables
shown on the most Conductivity solutions.
Important: Always rinse the cell with distilled water before calibration and when switching from one
standard solution to another to avoid contamination.
Replace standard solutions frequently, especially low conductivity ones.
Contaminated or expired solutions can affect the accuracy and precision of the measurement.
• Errors during calibration
NOT STABLE: The button
•
appear, to confirm the first point.
• WRONG BUFFER: The buffer you are using is polluted or not part of the recognized families.
CALIBRATION TOO LONG: The calibration has exceeded the time limit, only the points calibrated up
•
to 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
• 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
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.
Series 7 Vio ENG Version 2.0 April 2020
0.00 %/°C and then work by bringing the solutions

has been pressed with unstable signal. Wait for the icon
to return to measure mode.
.
means that the measurement is not stable yet.
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EN