Product Overview

The velocity measurement of the Doppler Flow Velocity Meter is based on the Doppler effect. The velocity sensor emits ultrasonic waves at an upward angle, which propagate through the fluid. The fluid contains impurities such as bubbles or particles (which can be assumed to move at the same speed as the water flow). When the ultrasonic waves encounter these impurities, the reflected waves undergo a Doppler frequency shift Δf. This Doppler frequency shift Δf is proportional to the flow velocity, allowing the fluid velocity V (m/s) to be measured by detecting Δf.

Water level measurement utilizes a built-in pressure sensor to determine the distance from the Doppler Flow Velocity Meter to the water surface. The built-in temperature sensor measures the water temperature to further calibrate the water level reading.

By inputting channel parameters and combining them with the measured water level H (m), the cross-sectional area S (m2) of the water flow is calculated. The instantaneous flow rate (Q = V * S) is derived by multiplying the cross-sectional area by the flow velocity V (m/s). The cumulative flow is then calculated by multiplying the flow rate by the accumulated time.

The product features an integrated ABS housing, ensuring effective waterproofing and sealing. It is particularly suitable for low-water-level applications and can perform accurate measurements even when the water level is as low as 5 cm.

Product Features

1. Utilizes Modbus communication protocol with RS485 interface.

2. Easy installation with a metal base fixing device for straightforward setup.

3. Fully electronic design with wide voltage supply, low power consumption, and no mechanical components.

4. Provides accurate, stable, and highly reliable measurements with strong anti-interference capabilities.

5. Widely applicable for measurement and monitoring in non-full pipes, sewage outlets, culverts, box culverts, manholes, and open channels.