Automatic Cond Calibration - XS Instruments 70 Serie Manuel D'utilisation

P3.9 Temperature calibration
All the instruments in this series are pre-calibrated for a correct temperature reading. However, if there is a
difference between the measured and the real one (usually due to a probe malfunction), it is possible to
perform an offset adjustment of + 5°C.
Use the keys and
 Automatic COND calibration
Example: one-point calibration (1413 µS / cm) using a cell constant sensor 1
 In COND measurement mode
 Rinse the cell with distilled water and dab gently with paper towel.
Start with a few ml of standard solution. Dip the sensor in the standard 1413 µS / cm, keeping it slightly
stirred and making sure that there are no air bubbles in the cell.
On the display, next to the string "POINT COND", all the Conductivity values, that the instrument can

recognize, alternate.
 The string "WAIT FOR STABILITY" and the flowing red bands indicate that the measurement is not stable
yet.
When the value stops on 1413 and the icon

as indicated by the string "PRESS OK".
 The actual measured value flashes on the display and then it is shown the updated cell constant.
 The icon appears, which indicates that the instrument is calibrated in the medium conductivity
range.
Automatically, the device returns to measure mode.
One-point calibration is enough, if measurements are performed within the measurement

range. For example, the standard solution 1413 µS/cm is suitable for measurements
between 200 – 2000 µS/cm.
 To calibrate the instrument on several points, once returned to the measure mode, repeat all the
calibration steps. The beaker relating to the new calibrated point will join the previous one.
It is recommended to start the calibration from the less concentrated standard solution and then
continue in order of increasing concentration.
When a new calibration of a previously calibrated point is performed, it is overwritten on the

previous one and the cell constant is updated.
 For each cell constant (P3.1), the instrument stores the calibration, to allow the user who uses multiple
sensors with different constants not to be forced to recalibrate each time.
 The instrument recalls the last calibration with respect to the selected parameters P3.1 (cell constant)
and P3.2 (type of calibration solutions).
Important: Standard conductivity solutions are more vulnerable to contamination, dilution and
direct influence of CO2 than pH buffers, which, on the other hand, thanks to their buffer
capacity, tend to be more resistant. In addition, a slight change in temperature, if not
adequately compensated, can have significant effects on accuracy. Therefore, pay attention in
the calibration process of the Conductivity cell in order to obtain accurate measurements.
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.
ATTENTION: Before proceeding with the calibration operations, carefully consult the safety
data sheets of the substances involved:
 Calibration buffer solutions.
UM Serie 70Vio EN rev. 1 04.06.2020
to correct the temperature offset value and confirm with
press the key
appears: confirm the calibration with the key
26
to enter the calibration mode.
EN
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