The Doppler flowmeter emits high-frequency ultrasound (or radio waves) into the water, and the ultrasound scatters when it encounters suspended particles (such as sediment and plankton) in the water flow. Due to the movement of particles with water flow, the frequency of scattered waves will change (Doppler shift). The instrument calculates the water flow velocity by measuring the frequency difference between the emitted wave and the scattered wave, combined with parameters such as the sound wave propagation path and angle. Combining water level information, the fluid flow rate is obtained through the velocity area method.

Doppler flowmeterThe accuracy of flow velocity measurement can usually reach ±1%-3%The flow calculation error is small, meeting the needs of scientific research and engineering. Wide range, capable of measuring weak to strong currents, suitable for different flow rate scenarios. It can continuously monitor changes in flow velocity and provide data such as instantaneous flow velocity and average flow velocity. Support flow field distribution analysis to assist in studying the dynamic characteristics of water flow.

Precautions for use:

Medium requirement: The fluid must contain sufficient suspended particles (concentration usually ≥)5mg/L）If it is pure water (such as laboratory ultrapure water), additional additives are requiredtracerParticles can only be measured normally.

Installation angle: When measuring handheld, the transducer needs to be at a fixed angle with the direction of water flow, and angle deviation can cause measurement errors; Fixed installation requires ensuring that the transducer is facing the water flow and avoiding interference from pipe bends or valves.

Maintenance and cleaning: After long-term use, it is necessary to regularly clean the dirt on the surface of the transducer to prevent obstruction of sound wave propagation and affect measurement accuracy.