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A sewage flow meter is a commonly used flow measurement instrument, primarily employed in sectors such as municipal water supply, steel manufacturing, petroleum, chemicals, power generation, industry, water resources management, and water policy to measure the volumetric flow of liquids. So what are the requirements for users when installing sewage flow meters? 1) Site selection: It is necessary to keep as far away as possible from devices with strong electromagnetic fields, such as large motors, large transformers, and large frequency converters. The installation site should be free from severe vibrations, the pipes must be securely fixed, and the ambient temperature should remain stable (to prevent phase changes between solid and liquid states). The installation environment should facilitate installation and maintenance. 2) Location selection The installation location must ensure that the pipeline is always filled with the liquid to be measured. Choose a location with low liquid flow pulsation, away from pumps, valves, elbows, and other components that cause local resistance. When measuring biphasic (solid, liquid and gas, liquid) liquids, a location that does not easily cause phase separation should be selected. The inner diameter or circumference of the pipeline under test should be easy to measure, and its ellipticity should be low. 3) Length of straight pipe section: The length of the straight pipe section on the upstream side of the pipeline where the sensor is installed should be greater than or equal to 10D, while it should be at least 5D on the downstream side (D being the diameter of the pipeline being measured). 4) Flow control valves and regulating valves: Flow control valves should be installed within the pipeline under test, on the upstream side of the sensor, while flow regulating valves should be installed on the downstream side of the sensor. During flow, the flow control valve should usually be in the fully open position. Flow metering is one of the components of measurement science and technology, and it is closely related to the national economy, national defense construction, and scientific research. Doing this job well plays an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology. Especially in today’s era of energy crises and increasing automation in industrial production, the significance and role of flow meters in the national economy have become even more evident.