What is the principle and function of ultrasonic open channel flowmeter?

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1. Principle of Ultrasonic Open Channel Flow Meter

The principle of ultrasonic open channel flow meter is based on the conversion relationship between liquid level and flow rate of the measuring weir tank. It measures the water level in the weir tank and calculates the flow rate using a preset formula. The specific principle and key points are as follows: the core composition and structure are composed of ultrasonic probe (measuring liquid level) and flow calculation transmitter, which are divided into integrated and split types according to the structure. The probe is responsible for real-time monitoring of the water level height in the weir tank, and the transmitter converts the liquid level data into flow values. The function of the water measuring weir groove needs to be used in conjunction with standardized weir grooves (such as Bacher grooves, rectangular grooves, triangular weirs). The geometric dimensions (gaps or constrictions) of the weir groove are smaller than the cross-sectional area of the channel, forming a single value correspondence between the upstream water level and flow rate, that is, the same liquid level corresponds to the same flow rate, eliminating the interference of channel cross-sectional area, slope, roughness and other factors on flow rate. Typical weir groove type: Bacher groove: suitable for high flow measurement, stable water flow, and strong anti clogging ability. Triangle weir: With a simple structure, it is suitable for low flow or low velocity scenarios. Rectangular groove: a middle type weir groove that balances flow range and installation convenience. Principle of Liquid Level Flow Conversion for Water Level Measurement: Ultrasonic probes emit sound waves towards the liqu

id level, and the liquid level height is calculated based on the reflection time. Formula calculation: Based on the type of weir, call the preset flow formula or empirical formula (such as Bachers formula, triangular weir formula) to convert the liquid level value into a flow value. Dynamic response: When the flow rate increases, the liquid level in the weir tank rises; When the flow rate decreases, the liquid level drops, forming real-time dynamic monitoring. Level gauge type Ultrasonic level gauge: non-contact measurement, suitable for corrosive or high viscosity liquids, but vulnerable to foam and steam interference. Static pressure level gauge: measures liquid level through a pressure fiber force sensor, with a simple structure and low cost, but requires contact with liquid and may be affected by sediment. Application scenarios and advantages Applicable scenarios: reservoirs, rivers, water conservancy projects, urban water supply, sewage treatment, farmland irrigation, etc. Rectangular, trapezoidal, U-shaped open channels. Core advantages: No need to cut off water flow, easy installation, low maintenance cost. Suitable for non full pipes and open discharge channels, with a wide measurement range (from small flow to large flow). Strong anti-interference ability, capable of long-term stable operation in harsh environments. The difference between ultrasonic open channel flow meters and ordinary open channel flow meters is that the liquid level and flow rate of ordinary open channel flow meters have no definite relationship (due to factors such as channel shape and slope), while ultrasonic open channel flow meters are designed with a standardized weir and buffer groove, which strictly corresponds the liquid level and flo

1. Principle of Ultrasonic Open Channel Flow Meter

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