Automatic Cond Calibration - Dostmann pH 7 Vio Manuel D'utilisation

P3.6 COND Calibration Data
Access this menu to get information on the last calibration performed. The following screens will
automatically scroll on the display.
• First screen: beakers indicating the buffers used for calibration.
• Second and possibly third, fourth and fifth screens: value of the actual cell constant in the
measurement range indicated by the beaker.
Note: The instrument accepts calibrations with a maximum tolerance of 40% on the nominal
value of the cell constant only.
P3.8 COND parameter Reset
If the instrument does not work properly or incorrect settings have been made, confirm YES with the key
to return all the parameters of the pH menu to the default settings.
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.
Series 7 Vio ENG Version 2.0 April 2020
to correct the temperature offset value and confirm with
press the key
27
to enter the calibration mode.
appears: confirm the calibration with the key
EN
.