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When measuring liquids with an electromagnetic flowmeter in a pipe that is not filled, there are two scenarios: either the liquid level is above the level of the measuring electrodes or below it. a. In an electromagnetic flowmeter, when the liquid level inside the pipe is above the level of the electrodes, and if there are straight sections of pipe before and after it, the measurement value provided by the electromagnetic flowmeter will generally vary somewhat. However, the volume of liquid measured by the flowmeter includes the volume of the unfilled part of the pipe,; thus this type of measurement has significant advantages. b. When the liquid level inside the tube is below the electrode contour of the electromagnetic flowmeter, the electrodes are exposed to the atmosphere, and the measurement circuit is effectively in an open-circuit state. The measurement value and output of the electromagnetic flowmeter take on a random pattern, constantly fluctuating around the full scale. In non-full-pipe conditions, it is usually a direct discharge outlet with no back pressure, either due to the flow of fluid itself or because there is no flow meter present. 1. The aforementioned method using bubbles can be employed; in this case, measuring the electrode resistance with an analog multimeter will result in a significantly higher loop resistance of the electrode. 2. When installing an electromagnetic flowmeter, it should be placed as low as possible in the pipeline; the outlet should be raised, or the flowmeter can intentionally be installed in a U-shaped pipe. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content! http://www.yb1518.com/UploadFiles/2012717174126829.jpg