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.