Open channel sewage flowmeter

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1. Measurement principle of ultrasonic open channel flowmeter

1. The measurement principle of open channel flowmeter is to set up standardized weirs in the open channel, measure the water level at designated positions, and make the flow rate through the weirs and the water level in a single value relationship; Measure the water level, and convert the ultrasonic open channel flowmeter into a flow value based on the corresponding flow formula or empirical formula. The larger the flow rate in the ultrasonic open channel flowmeter channel, the higher the liquid level in the weir; The smaller the flow rate, the lower the liquid level. In general channels, there is no definite correspondence between liquid level and flow rate. Because of the same water depth, the flow rate is also related to the cross-sectional area, slope, and roughness of the channel. 2. Install a channel weir in the channel. The correspondence between upstream water level and channel flow mainly depends on the geometric dimensions of the weir due to the narrowing of the groove or trough being smaller than the cross-sectional area of the channel. The same weir is placed on different channels, and the same liquid level corresponds to the same flow rate. The weir converts flow into liquid level. There are generally two types of level gauges used in open channel flow meters, namely ultrasonic level gauges and static level gauges. Ultrasonic open channel flow meters are instruments used to measure the flow rate of liquid in self flowing open channels with incomplete pipelines. The application fields of ultrasonic open channel flowmeter include urban water supply channels, power plant cooling water drainage channels, sewage treatment inlet and outlet c

2. How to install an electromagnetic open channel flowmeter? The installation of electromagnetic open channel flowmeter should be combined with its working principle and structural characteristics to ensure measurement accuracy and equipment stability. The following are specific installation steps and precautions:

1. Before installation, prepare to confirm that the installation position is suitable for flow measurement in rectangular and trapezoidal open channels and culverts. It is necessary to choose a straight channel section with smooth water flow, no eddies, and severe fluctuations. Avoid interference sources such as bends, gates, pump stations, etc., and ensure that the length of the upstream and downstream straight channel sections meets the requirements (usually upstream ≥ 5 times the channel width, downstream ≥ 3 times the channel width). Ensure that the installation location is convenient for daily maintenance and repair. Check the integrity of the equipment and verify whether the components, including flow display, flow meter, liquid level meter, sensors, connecting cables, and installation accessories, are complete. Check if the sensor excitation system, electrodes, and processing chips are intact to avoid transportation damage. Confirm the power supply mode (220VAC or 9-36VDC) through environmental adaptability assessment, and arrange the power supply line in advance. If wireless remote transmission function is required, check the on-site GSM/GPRS

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