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Abstract

This paper presents the results of evaluating the metrological characteristics of a developed ultrasonic flowmeter intended for measuring water flow in open channels. The study analyzes the main sources of measurement errors and classifies them into methodological, instrumental, additional, systematic, and random components. Experimental investigations were carried out to estimate the random and systematic errors under steady-state flow conditions. Using the least-squares method, the systematic error was separated into additive and multiplicative components, providing a basis for calibration and correction of the measurement results. The reliability of the developed measuring instrument was evaluated using the failure rate method based on the reliability characteristics of its electronic components. The probability of failure-free operation and the mean time between failures were determined, confirming the suitability of the device for long-term operation in water management systems. A calibration characteristic relating the output voltage of the measuring circuit to the water flow rate was constructed from experimental data. The obtained linear approximation demonstrated a high coefficient of determination (R² = 0.995), confirming the adequacy of the mathematical model and the linearity of the measurement conversion. The obtained results indicate that the developed ultrasonic flowmeter provides reliable and accurate flow measurements and can be effectively applied in irrigation systems, water resource monitoring, and wastewater management.

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57

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64

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