28
Rev. 1 20.12.2019
EN
Use the keys
and
to correct the temperature offset value and confirm with
.
Automatic Cond calibration
Example: One-point calibration (1413 µS/cm) using a K=1 cell constant
In COND Measurement mode
press
to enter calibration mode.
Rinse the cell with distilled water and dab gently with absorbent paper.
Start with a few ml of standard solution. Immerse 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 will appear.
The string “WAIT FOR STABILITY” and the flowing red bands indicate that the measurement is stable
yet.
When the value stops on 1413 and the icon
appears, confirm the calibration pressing
as
indicated by the string “PRESS OK”.
The actual measured value flashes on the display and the updated cell constant is then shown.
The icon
appears which indicates that the instrument is calibrated in the medium conductivity
range.
Automatically the device returns to measurement 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
about 200 - 2000 µS / cm.
To calibrate the instrument on several points, once returned to the measurement, repeat all the
calibrations steps.
The beaker relating to the new calibrated point will join the previous one.
It is advisable 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, so as 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 parameters P3.1 (cell constant) and P3.2
(type of calibration solutions) selected.
Important: Standard conductivity solutions are more vulnerable to contamination, dilution and direct
influence of CO2 than pH buffers, which instead, 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