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Calibration
Calibration adapts the device to the individual sensor characteristics.
It is always recommended to calibrate in air.
Compared to water, air is a calibration medium which is easy to
handle, stable, and thus safe. In the most cases, however, the sensor
must be removed for a calibration in air.
When dealing with biotechnological processes which require sterile
conditions, the sensor cannot be removed for calibration.
Here, calibration must be performed with aeration directly in the
process medium (e.g. after sterilization).
In the fi eld of biotechnology, for example, often saturation is mea-
sured and calibration is performed in the medium for reasons of
sterility.
For other applications where concentration is measured (water control
etc.), calibration in air has proved to be useful.
Note:
• All calibration procedures must be performed by trained person-
nel. Incorrectly set parameters may go unnoticed, but change the
measuring properties.
• If a 2-point calibration is prescribed for trace-oxygen measurement,
the zero calibration should be performed prior to slope calibration.
See main user manual.
Common combination: process variable / calibration mode
Measurement
Saturation
Concentration Air
In the following, the calibration procedure for a slope calibration in air
is described. Of course, other combinations of process variable and
calibration mode are possible.
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Calibration
Water
Application
Biotechnology; sensor cannot be
removed for calibration (sterility)
Waters, open basins