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A non full pipe flowmeter is an automatic flow measurement method that utilizes the flow rate area method to continuously measure fluid flow in open pipelines (such as half pipe sewage pipelines and large flow pipelines without overflow weirs). It can measure and display instantaneous flow rate, flow rate, cumulative flow rate, and other data. Especially suitable for measuring the discharge of municipal rainwater, wastewater, sewage, and irrigation water pipelines. A non full pipe flowmeter is composed of a flow rate sensor, a water level sensor, and a flow display instrument. It continuously measures the flow rate and liquid level of the fluid in the pipeline. As long as the user inputs the inner diameter of a circular pipeline or the width of a square pipeline, the non full pipe flowmeter will automatically calculate the flow rate in the pipeline and display measurement parameters such as instantaneous flow rate, flow rate, and cumulative flow rate in the pipeline.