Good Doppler open channel flowmeter| water flow rate meter

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1. Issues with open channel flow meters

1. There should be a straight section upstream of the channel that is greater than 5 times the width of the channel, so that the water flow can smoothly enter the channel.

2、 The slots are made according to standard dimensions, and the cross-sectional area and flow rate can be calculated based on the level of liquid. The built-in flow accumulator of the open channel flowmeter can accumulate the instantaneous flow rate of the front chain group.

3、 The water is in a static state, and the flow rate should be zero. It depends on the settings of the internal data parameters of your instrument. 4. Installation issues of the level gauge: whether the position is correct, whether the highest water level enters the blind zone of the level gauge (ultrasonic level gauge). If it is a static pressure level gauge, it depends on whether the pressure hole of the sensor probe is blocked. 2. Working principle and advantages and disadvantages of radar open channel flowmeter. Radar open channel flowmeter measures the surface velocity and water depth of the water flow, and calculates the flow rate of the water section by combining hydraulic models. Its core principle is based on Doppler frequency shift effect and velocity area method, and it has the characteristics of high-precision and non-contact monitoring. Working principle: Doppler frequency shift effect: Based on the Doppler frequency shift effect in physics, when the water flows or moves relative to the flowmeter, the frequency of the radar wave signal emitted by the instrument is shifted. The frequency offset is directly proportional to the flow velocity of water, and the surface flow velocity of water can be calc

ulated by measuring the frequency offset. Synchronous measurement of water level and flow velocity: using pulse radar to measure water level, combined with cross-sectional data to calculate dynamic discharge area; After converting the surface velocity into the average velocity at the beginning of the cross-section through the model, the instantaneous flow rate is calculated using the velocity area method (flow rate=average velocity x water area). System composition: It consists of a radar flowmeter, a radar water level gauge, and a flow calculation terminal, which synchronously obtain water level and flow velocity data through non-contact means. Advantages of all-weather monitoring capability: Using high-frequency microwave ranging technology, it can achieve 24-hour continuous monitoring and adapt to harsh weather conditions such as rain, snow, and haze. Strong anti-interference ability: not affected by environmental factors such as temperature, humidity, and wind, with high measurement stability. High precision sensor: The flow velocity measurement accuracy can reach ± 0.01m/s, and the water level measurement accuracy can be ± 1mm, meeting the needs of hydrological monitoring. Non contact measurement: No mechanical wear parts, avoiding corrosion or blockage problems caused by contact with water flow in habitual equipment. Wide adaptability to water quality: The measurement results are independent of water quality and are not affected by floating ice, sediment, floating objects, etc. High cost-effectiveness: easy installation and maintenance, equipment lifespan of over 10 years, and low overall operation and maintenance costs. Wide flow velocity measurement range: capable of measuring flow velocities ranging from 0.15m/s

Good Doppler open channel flowmeter

1. Issues with open channel flow meters

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