Dry calibration procedure of electromagnetic flowmeter for open channels

This paper presents a simple approach to a dry calibration procedure for th e electromagnetic flowmeter for both conducting and nonconducting open-flow channels. The author focuses on two main problems: variable mater level in the measurement zone and variable water or ground conductivity and their i nfluence on a flow signal. Based on the existing numerical model of electro magnetic flowmeter, the author describes the main idea of transfer function calculation with a few exemplary results. As an approximation instrument f or a final form of correction function, the sigmoidal two-layer neural netw ork has been applied.