Abstract
Electromagnetic (EM) flow velocity probes have some important advantages over normal full scale flow meters when being used in pipe flow measurement. To predict the sensitivity of an electromagnetic probe, with the effect of electrode and magnetic coil arrangement, properties of pipe wall and probe wall, work has been done recently on a mathematical model of an electromagnetic flow velocity probe [1]. This paper gives a brief description of the model. Then the model is used to calculate the pipe wall effect where the pipe wall of different properties is near the sensing head of the probe. The result of the calculation gives a suggested minimum distance between the pipe wall and the electrodes of the probe to keep the error of sensitivity within an accepted degree.
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