Doppler Flow Meter

I. Product Overview

Doppler flow meter principle: when an ultrasonic sound source and an observer move relative to each other, the frequency received by the observer differs from the frequency of the ultrasonic sound source. Therefore, small particles and small bubbles moving with the water relative to the ultrasonic transducer will also change the frequency received by the transducer, and this change increases with the movement speed of suspended matter in the water. The Doppler frequency shift is thus measured, and in turn the flow velocity of the water at the point where the Doppler flow meter is located is determined. It is mainly used in irrigation open channels, municipal sewer pipes, hydrological basins and similar occasions. It is particularly suitable for low-water-level occasions: it can work when the water level exceeds 15 cm. In regular pipes and channels, the water depth is measured by the pressure sensor on the flow meter and the flow velocity by the ultrasonic sensor, so the flow rate can be conveniently calculated.

The product measures flow velocity based on the ultrasonic Doppler effect principle, and can measure the water level via a pressure sensor and the water body temperature via a temperature sensor. The housing is made of PVC plastic for effective waterproof sealing. The housing is 25 cm long, 3 cm high and 7 cm wide. It can measure flow velocity in open channels and relatively large pipes.

II. Product Features

1. Handheld design, battery-powered, compact and lightweight, balancing mobile testing needs;

2. Bidirectional monitoring of flow velocity and flow rate; data is displayed on the instrument in real time, and cumulative totals in both directions as well as total flow are calculated;

3. High-performance quad-core processor, Android system, friendly interface, simple and smooth operation;

4. WiFi networking function: test information can be uploaded to the platform for data statistics and regulatory early-warning;

5. Monitors flow velocity and flow rate; data is displayed on the instrument in real time, and cumulative total flow is calculated;

6. Built-in GPS positioning for real-time display of the monitoring location, facilitating data analysis;

7. Automatic storage function; the automatic storage interval can be set, replacing manual data collection;

8. Test result storage capacity of 1 million records, supporting data storage and retrieval;

9. Test results can be exported as an Excel spreadsheet and viewed on a computer;

10. Real-time display of current water level, current temperature, cross-sectional area and total flow;

11. Equipped with a 6000 mAh large-capacity lithium battery to ensure monitoring endurance;

12. Adopts the Modbus communication protocol and communicates via the RS485 bus;

13. The underwater sensor is easy to install, with a metal base fixing device for simple mounting;

14. The equipment is entirely electronically designed, with wide-voltage power supply, low power consumption and no mechanical parts;

15. Offers the advantages of accurate and stable measurement, high reliability and strong anti-interference capability;

16. Wide application range: can be applied in various water environments from tap water to Yellow River water;

17. ★ Overall instrument dimensions not exceeding 25 cm × 7 cm × 3 cm, ensuring lightweight use for operators;

18. Standard Type-C charging; the device can be charged directly with a mobile phone charger;

19. Flow velocity correction and water level correction functions;

20. Continuous testing, with data acquisition time settable in seconds;

21. Interface settings allow modification of the title and footer information, flexibly displaying instrument information;

22. Automatic backlight adjustment function and sleep time setting function;

23. The device displays remaining battery power;

24. IP65 protection rating.

III. Technical Parameters