Jenway 3540 - Manual (Page 33)

4.10 Conductivity Calibration Set Up
The conductivity calibration set up menu contains options for setting the Cell
Constant (K factor), the EC ratio for TDS measurement, the Reference temperature
and co-efficient as well as the ultra-pure water compensation algorithm. There are
also sub-menus for entering Calibration standard values and for the calibration
reminder. Access the Conductivity Calibration Set Up menu by carrying out
paragraphs 4.01 to 4.05, then use the up or down arrow keys to move the highlight
over the Calibration Set Up option then press the Enter key. The Calibration Set Up
screen below will be displayed…
Conductivity calibration Set Up screen
4.11 Cell Constant (K)
Most conductivity probes are supplied with a cell constant (K factor) that has been
calculated during manufacture. This offers a quick and basic method for calibration
without the need for standard solutions. It should be noted that this cell constant is
dependent on the condition of the plates in the probe; wear and the quality of routine
maintenance will affect these. This method of calibration should be used with care.
The cell constant that is shown in this menu is up-dated whenever a calibration is
carried out with standard solutions so can be used to re-calculate this value.
To set the cell constant to that indicated on the conductivity probe in use, press the
down arrow to highlight Cell Constant (K) in the Conductivity Calibration set Up
screen then press the Enter key to move the highlight to the current selection. A data
entry box will appear in the centre of the screen (as shown below). The box around
the least significant digit will be flashing to indicate that this digit can be changed by
pressing the up or down arrow keys. When this is set to the desired value the right or
left arrow keys can be used to move the flashing highlight to the other digits, which in
turn can be adjusted to the desired levels with the up or down arrow keys.
Data entry box for setting the Cell Constant (K)
When all digits are set to the desired levels press the Enter key to confirm the setting
and return the highlight to the left-hand side of the menu. Use the Escape [ESC] key
to return to other menu levels or continue with the conductivity calibration set up as
follows.