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In this paper the accuracy analysis of the proposed dissolved oxygen measurement system based on the dark's cell and the PSoC configurable mixed signal array chip is performed. In that process critical sources of errors are determined and associated errors are measured. The temperature, as the most affecting parameter of oxygen measurements, is analyzed in greater detail. Monitoring and regulation of temperature of the sample is crucial for precision oxygen concentration measurements. In order to achieve optimal accuracy level, system construction considerations are discussed and averaging algorithm and two point calibration methods are applied.