The liquid in the tube is not full due to insufficient back pressure or poor installation position of the flow sensor, so that the liquid in the measuring tube is not filled, and the failure phenomenon is different due to the degree of imperfection and the flow condition. If a small amount of gas is stratified or wavy in the water pipe, the fault phenomenon shows an increase in error, that is, the flow measurement value does not match the actual value; if the flow is a bubble flow or a plug flow, the fault phenomenon does not match the actual value. In addition, the output sloshing occurs due to the vapor phase instantaneously covering the surface of the electrode; if the gas phase of the cross-sectional area of ​​the horizontal pipe is increased in the stratified flow, that is, the liquid is not full, the output sloshing may occur if the liquid is not full. The situation is so serious that the liquid level is below the electrode and the output is full.
Example 1 A shipyard has a DN80mm electromagnetic flowmeter to measure the water flow. The operator reports that the flow rate is zero when the valve is closed, and the output reaches the full scale value. On-site inspection found that there was only a short tube downstream of the sensor, the water was directly discharged into the atmosphere, and the shut-off valve was installed upstream of the sensor. After the valve was closed, the water in the sensor measuring tube was completely drained. By modifying the valve to position 2, the fault is solved. The cause of such failures is often encountered in the case of the after-sales service of the manufacturer, which is an engineering design error.
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