32
Rev. 1.0 31/01/2020
EN
•
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
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
•
Manual COND calibration
Example: Calibration at 5.00 µS/cm using a K=0.1 cell constant
•
Access the Setup menu for COND SETTINGS and select in the
P3.1
0.1
and into the program
P3.2
Custom,
then
go back to the measurement and go into
COND
mode
.
•
Press the key
to enter the calibration mode.
•
Rinse the cell with distilled water and dab gently with paper towel.
Apply few ml of standard solution and immerse the sensor in the conductivity standard 5.00 µS/cm.
•
The string “
WAIT FOR STABILITY
” and the flowing red bands indicate that the measurement is not stable
yet.
•
Wait for the Conductivity value on the display to stabilize; when the icon
appears, use the keys
and
to adjust the value by entering that of the standard solution (e.g.: 5.00 µS/cm), as
indicated by the string “
ADJUST THE VALUE
” and by the icon
.
•
When the icon
appears again, confirm the calibration point by pressing the key
.
•
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 low conductivity range.
Automatically, the device returns to measure mode.
•
For each cell constant (P3.1), the instrument stores the calibration in order 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 parameter P3.1 (cell constant) and P3.2 (type
of calibration solutions) selected.
