CM14 Maintenance
Endress+Hauser 29
Calibrating the cell constant
In the cell constant calibration, always use a defined conductivity reference solution with raw
conductance values that are specified at the various temperatures. The correct calibration
always takes place without temperature compensation.
Setting: In the menus, navigate to Extended Setup → Input → T.comp.cal: Select "off".
This switches off the temperature compensation for the calibration.
The new cell constant is calculated from the new conductivity reference solution.
The method for cell constant calibration is the same for conductive and inductive conductivity.
Only the conductivity reference or standard solutions that are adapted to the measuring
ranges may be used.
For the conductive sensors (CLS15D,CLS16D and CLS21D), standard solution CLY11-A
74.02 µS/cm, CLY11-B 149.75 µS/cm.
For the inductive sensor (CLS50D), standard solution CLY11-C 1.40 mS/cm, CLY11-D
12.65 mS/cm.
1. Press "E" to call up the main menu.
2. Press the "+" button to navigate to the "Calibration" menu.
3. Press "E" to open the menu.
4. Press "E" to open the "Cell const." submenu.
The current cell constant is displayed.
5. Remove the sensor from the measurement medium, flush with distilled water and dry.
6. Press "+" to enter the conductivity reference solution "cond. Ref."
Entering the value of the conductivity reference solution at the current temperature
7. Press "+".
"Insert sensor in med." is displayed.
8. Insert the sensor into the conductivity reference solution.
9. Press "+".
"wait for stable value" is displayed.
Display reads "wait for stable value", when the value is stable, the display switches to
"New cell constant".
10. Press "+".
"Save Calib. Data" is displayed.
Press E and apply calibration data using "Yes".
8 Maintenance
No special maintenance work is required on the device.
To Next Page
Loading...
