High Precision Doppler Velocity Flow Meter for Open Channels Pipe Networks

Doppler Velocity‑Flow Meter is an integrated hydrological monitoring device developed based on the ultrasonic Doppler effect. It integrates velocity, water level, temperature and flow monitoring functions, and is specially designed for complex working conditions such as open channels, pipe networks and culverts. Breaking the limitations of traditional monitoring equipment, it supports accurate measurement at low water levels. Featuring high precision, great stability and low power consumption, it is widely used in municipal sewage discharge, water conservancy irrigation, water environment monitoring and other scenarios, serving as core equipment for intelligent hydrological flow data collection. 

Relying on the well‑established Doppler effect principle, the Doppler Velocity‑Flow Meter conducts flow velocity monitoring. Its sensor emits ultrasonic waves obliquely upwards and captures reflected frequency‑shift signals generated by air bubbles and suspended particles in water flow. Real‑time flow velocity is calculated by precisely measuring the frequency‑shift difference. Meanwhile, a built‑in high‑precision pressure sensor and temperature sensor collect real‑time water‑level data and perform water‑temperature correction to avoid measurement errors caused by temperature variations. After users input channel parameters, the device automatically calculates the cross‑sectional flow area. The instantaneous flow rate is obtained by multiplying flow velocity by cross‑sectional flow area, and cumulative flow statistics are completed synchronously with fully automatic calculation for accurate and efficient data output. 

The Doppler Velocity‑Flow Meter delivers outstanding performance with wide measuring ranges and superior precision. Flow velocity measurement ranges from 0.021 m/s to 10.00 m/s with a resolution of 0.001 m/s and measurement accuracy of ±1.0%FS. Water‑level ranges from 0.02 m to 10 m with accuracy of 0.5%FS, enabling accurate monitoring at an ultra‑low water level of 5 cm and suiting various shallow‑water and low‑flow monitoring scenarios. Flow measurement covers 0.001 m³/s ~ 999.99 m³/s with a broad cumulative flow metering range, fully meeting long‑term monitoring requirements for diverse applications. Operating temperature ranges from 0 ℃ to 60 ℃ and storage temperature from ‑20 ℃ to 80 ℃, granting strong environmental adaptability.

Adopting an all‑electronic mechanical‑free structure, the Doppler Velocity‑Flow Meter eliminates wear, jamming and other defects of conventional mechanical components, ensuring stable operation and strong anti‑interference capability. It supports wide‑voltage power supply of 7.5‑15 V DC with total power consumption ≤20 mA@12 V. Ultra‑low power consumption makes it suitable for long‑term unattended outdoor monitoring. Equipped with RS485 interface and standard Modbus‑RTU protocol, it realizes stable data transmission and excellent compatibility for easy connection with various monitoring platforms.

Boasting robust structure, the device features an integrated sealed ABS housing with IP68 protection grade, providing waterproof, dust‑proof and corrosion‑resistant performance for harsh conditions including humid environments and sewage. Fitted with a dedicated metal base fixture, it allows simple base‑mount installation without complicated construction. It fits numerous monitoring sites such as partially‑filled pipes, sewage outlets, culverts, box culverts, manholes and open channels with remarkable installation adaptability.

Overall, the Doppler Velocity‑Flow Meter combines multiple merits including high precision, great stability, easy installation, low power consumption and wide compatibility. It addresses pain points of traditional hydrological monitoring equipment such as failure in low‑water‑level measurement, frequent mechanical faults and large data errors, and delivers accurate, reliable and efficient flow‑monitoring solutions for water conservancy & water services, environmental monitoring, municipal engineering and other industries.