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15.1.4.3
Calibration of zero point
Calibrating the controller diaLog DACb
CAL Cl
Calibration successful
Slope
Zero point
continue with <CAL>
Fig. 61: Calibrating the reference value
6.
Transfer the result of the calibration into the controller
memory by pressing
ð The controller displays the continuous display again and
operates with the results of the calibration.
Incorrect calibration
An error message appears if the result of
the calibration lies outside the specified
tolerance limits. In this case, the current
calibration is not applied.
Check the prerequisites for calibration
and clear the error. Then repeat calibra‐
tion
Permitted calibration range
The permitted calibration range is 20 ... 300% of
the sensor's rated value.
Example of a shallow slope: Blocking of the sensor
membrane leads to a low slope (low slope = low
sensor sensitivity)
Example of a steep slope: Surfactants make the
sensor membrane more permeable, leading to a
steeper slope (steep slope = high sensor sensi‐
tivity)
Necessity for calibrating the zero point
Calibration of the zero point is not generally neces‐
sary. A calibration of the zero point is only neces‐
sary if the sensor is operated at the lower limit of
the measuring range or if the 0.5 ppm sensor ver‐
sion is used.
A1047
97
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