Are optochemical oxygen sensors comparable?
Despite differing configurations and instruments, conducting systematic experiments under controlled conditions can reveal a consistent comparability in measurement results across all optochemical sensor types.
As oxygen measurements are a significant part of quality control, beverage producers across different industries have specific requirements that must be met. There are three different oxygen parameters can be of interest:
- Dissolved oxygen – DO (liquid phase)
- Headspace oxygen – HSO (gaseous phase)
- Total package oxygen – TPO
The measurement of these parameters can be based on different techniques:
- Chemical analysis (Winkler titration)
- Electrochemical method (Clarke electrode)
- Optochemical method (Optode)
The most prominent and convenient technique is the optochemical method including luminescence quenching.
This report highlights not only the remarkable accuracy of oxygen meters, but also the comparability among them. Furthermore, it is discussed which and how various factors can negatively impact the measurements, resulting in inconsistencies and reducing the comparability of results.
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