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9.2.2 Wet Calibration / Determination of Cell Constant
The conductivity of a calibration solution (of a conductivity that is known exactly) is
measured (see chapter 3.6.2 for calibration solutions). The display is adjusted to the
conductivity of the calibration solution, and the instrument computes the cell constant.
Procedure:
Two-circuit measurement:
Choose the measuring cell to be calibrated.
Clean the measuring cell.
Immerse the measuring cell and if applicable the temperature sensor, in the
calibration solution.
Start the calibration with the “E” key.
Display: measured value of calibration solution, ATC/MTC, temperature, Tc of
calibration solution.
Wait for the measured value to stabilize.
Accept measured value with “E” key.
Enter the setpoint.
Enter the exact value of the calibration solution with the arrow keys.
Confirm your entry by pressing the E key.
The computed cell constant is displayed.
Terminate or repeat calibration.
When End cal. is chosen, the newly determined cell constant is stored, and the
instrument switches to the measuring mode.
Note!
To carry out a highly accurate calibration, it is necessary to eliminate the
temperature influence which is due to the temperature difference from the
reference temperature, i.e. the calibration should be performed at the reference
temperature. If this is not possible, the calibration temperature or Tc value of the
calibration solution can be entered in the Commissioning / Calibration menu.
To assure accurate temperature registration, the temperature sensor should be
checked and calibrated before each calibration of the conductivity measurement
with the aid of the Commissioning / Temperature menu.
Warning!
The hold function does not stop ongoing Chemoclean cleaning cycles. Disable
the Chemoclean function in the Commissioning / Chemoclean menu (see
chapter 7.5) prior to calibration.
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