Oxygen index measuring instrument is used to measure the minimum oxygen concentration required for sample combustion in a mixture of oxygen and nitrogen gas under specified test conditions. However, there is no national calibration specification for the instrument, the metrological traceability system for oxygen index measuring instrument has not been established in China currently, and there is no means to evaluate the metrological performance of the instrument. This article proposes an effective calibration method for oxygen index measuring instrument by determining and studying its key technical parameters, basing on the analysis of the structure and measurement principle of oxygen measuring instrument, and combining with the national standard GB/T 2406.1-2008 Plastics - Determination of burning behavior by oxygen index - Part 1: Guidance. The experimental results show that the proposed calibration method is scientific and feasible. Furthermore, the uncertainty of the calibration results is evaluated, which proves that the calibration method is scientific and practical and provides reliable technical support for the quality insurance of oxygen index measuring instrument.
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Wang et al. (2024) studied this question.
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