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Evaluation of a new Optical Sensor for Measuring dissolved Oxygen by Comparison with Standard Analytical Methods
Titze, J., Walter, H., Jacob, F., Friess, A., Parlar, H.

The determination of the concentration of dissolved oxygen (O2) plays an important role in different stages of beer production. Only precise, stable and fast measurement procedures for determining the oxygen content in beer are therefore suitable for the use in breweries. A research project was carried out in order to evaluate the newly developed oxygen measurement system built in the CO2/O2 Gehaltemeter type c-DGM of Haffmans BV by comparison with other standard analytical references such as the Orbisphere 3650 from Hach Ultra Analytics GmbH and the DIGOX?6 from Dr. Thiedig & Co. The purpose of this study was to determine the precision and accuracy as two main criteria for the evaluation of a suitable oxygen measurement in the brewing industries, since the precision describes the quality of a measurement procedure and the accuracy the level of agreement between the indicated and real value. The measurement system of the c-DGM was compared with the certified reference systems during a series of tests. The measurement methods of the reference systems are specified in Brautechnische Analysenmethoden, volume II of the Mitteleurop?ische Brautechnische Analysenkommission (MEBAK) and are considered to be the recognized procedure for oxygen regulation in the brewing industry. It was observed that in comparison to the reference systems, the oxygen measurement system built in the c-DGM exhibited an effective work performance regarding precision and accuracy, and moreover signalized a fast response and low calibration efforts.

BrewingScience - Monatsschrift fr Brauwissenschaft, 61 (March/April 2008), pp. 66-80