This thesis describes the calibration process of differential pressure gas meters. Calibration procedures and methods are presented during this task. The measuring system that has been installed allows calibration of differential pressure meters at an increased line pressure. The calibration was carried out at three different line pressures, in order to check if the line pressure would have an impact on the calibrated meter. The expanded measurement uncertainty is evaluated. The results are shown in graphs and tables. They are also properly analysed and explained. It turned out that the increased line pressure had no impact on the calibrated meter used in the process.
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