Solutions for [signal reception issues] in electromagnetic flowmeters

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Electromagnetic flowmeters are primarily used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines, including the measurement of the volumetric flow rate of highly corrosive liquids such as acids, alkalis, and salts. Electromagnetic flowmeters can generally operate properly for a long time after installation without any maintenance, but later on maintenance and regular inspections are required. Not being able to receive a signal or having a weak signal are minor issues. So it’s not surprising if this happens; by following the steps below carefully, you can resolve it easily. 　　1. First, confirm whether the pipeline is filled with fluid. 　　2. For metal pipes with severe scaling on their inner walls, electromagnetic flowmeters can be used to cause the scaled areas to fall off or develop cracks by applying impact; however, it should be noted that this method may sometimes do no good for ultrasonic transmission, as gaps may form between the scale and the inner wall. 　　3. Carefully select the dense part of the pipe, polish it thoroughly, apply an adequate amount of coupling agent, and then install the probe. 4. If the pipe is too close to the wall, it is possible to install the probe on the diameter of the pipe at an inclined angle, rather than necessarily on the horizontal diameter; in such cases, the Z-method should be used for installing the probe. 5. Slowly move each probe around the installation site carefully to locate the point with the strongest signal, thereby preventing missed installation sites where a stronger signal can be received due to scaling on the inner wall of the pipe or local deformation of the pipe that causes the ultrasonic beam to reflect away from the intended area