18
If the temperature coefficient of the medium is not known, it can be
determined
�
In an IO-Link environment, existing tempcos of the media can be stored as
recipe in the controller so that the accuracy of the values to be detected is
improved�
8.6 Determination of the temperature coefficient tempco
1�
Set the parameters [T.Cmp] and [dAP] to zero: [T.Cmp] = [0], [dAP] = [0].
►
Write the changed values to the sensor�
2� Adjust the medium temperature to 25 °C and take down the value of the
conductivity after 2 min�
3� Heat up the medium to 45 °C and take down the value of the conductivity
after 2 min�
Example of values taken down: medium at 25°C = 500 µS/cm; medium at
45°C = 800 µS/cm
Temperature change = 20 K
4� Calculate the change of the conductivity in percent�
The conductivity has increased by 300 µS/cm. The percentage change is
300/500 = 60 %.
5� Calculate the temperature coefficient tempco: The tempco is calculated from
the change in percent and the temperature change: Tk = 60% / 20 K = 3 % / K
6� The calculated tempco can now be adopted into the parameter [T�Cmp]�
Example: [T.Cmp] = [3]. If necessary, set the damping (parameter [dAP]) again.
►
Write values to the sensor�
9 Operation
9.1 Function check
After power-on the device is in the operating mode� It carries out its measurement
and evaluation functions and generates output signals according to the set
parameters�
►
Check whether the unit operates reliably�