Research on Direct Calibration of Electromagnetic Flowmeter in Partially Filled Pipes

The methodology of the direct calibration for the electromagnetic flowmeter in partially filled pipes is presented in this paper. Based on the principle of the electromagnetic flowmeter, two main respects, including the flow liquid level and the weight function in partially filled pipes are introduced briefly, and the calibration technologies of the sensor, which consist of the device arrangements, the accurate measurement of the liquid level and the calibration of the flow discharge, are emphasized on, with the methodology based on the piecewise interpolation employed. The experimental results demonstrate that the methodology of the direct calibration is simple and effective for the real flow calibration of the electromagnetic flowmeter in partially filled pipes, with the stable measurement and the accuracy requirement satisfied.