With the advancement of technology, IoT technology has quietly entered our lives and work, and has been applied in various fields. Things such as hydrology and water conservancy, industrial monitoring, smart cities, and smart water management are connected to cloud servers through the Internet of Things, which improves production efficiency, flexibility, and responsiveness through big data analysis and processing.

The products originally used for measuring temperature, pressure, flow rate, and level in industry have also been directly transplanted to municipal applications by directly matching corresponding components or modules in the early days. Now, with the deep research and development of built-in communication chips, low-power design, dedicated power management solutions, and automatic sleep technology, the specialized sensing end IoT products designed for the characteristics of municipal applications are suitable for current practical applications.

With the continuous advancement of cloud services and related technologies, significant progress has also been made in remote monitoring, which can be quickly accessed through mobile apps, WeChat mini programs (which can cross mobile operating systems, even the recently popular HarmonyOS), IE, and other means to obtain relevant data and have a clear understanding of various parameters.

Doppler flow meter brings you professional service，this product is a sensor that measures the flow velocity and volume of water in natural water bodies. The working frequency of the ranging radar unit is 60GHz and adopts FMCW frequency modulation continuous wave system. The working frequency of the speed measuring radar unit is 24GHz, and the measurement point is located in front of the body without damaging the flow field; High measurement accuracy and linear flow measurement; Without rotating parts, it is not afraid of sediment blockage and water plants. The probe is sturdy and durable, without problems such as sediment blockage or entanglement of water plants and debris. It is suitable for measuring in rivers with high suspended sediment content, floating objects such as water plants, and harsh ice age conditions.

This type of radar level gauge can be widely used for flow monitoring in water level measurement stations, irrigation canals, sewage and rainwater pipe networks, etc.

main features 

1. High measurement accuracy and wide range;

2. Sensitive sensing, high resolution, not limited by start-up flow rate;

3. Fast response speed;

4. Measure linearity and there is no calibration curve for K and C values.

Working principle

The measurement principle of radar Doppler flowmeter is based on the Doppler effect in physics. According to the Doppler effect of electromagnetic waves, when there is relative motion between the wave source and the observer, the frequency of the waves perceived by the observer will be different from the frequency emitted by the wave source. The frequency change caused by relative motion is directly proportional to the relative velocity between the two objects In the radar Doppler flow measurement method, the radar sensor emits electromagnetic waves that, upon contact with the fluid surface, generate

Doppler FLOW METER brings you professional service，frequency offset and reflected back to the sensor and back to the receiver. The frequency difference between the transmitted wave and the received wave is the Doppler frequency shift of the wave generated by fluid motion. Since this frequency difference is proportional to the fluid flow velocity, measuring the frequency difference can obtain the flow velocity Furthermore, the flow rate of the fluid can be obtained Therefore, a necessary condition for radar Doppler flow measurement is that the measured fluid medium and the measuring equipment need to have a certain angle. This working condition is actually one of its major advantages, that is, this flow measurement method is suitable for measuring two-phase flow, which is a problem that other flow meters cannot solve. Therefore, as a promising two-phase flow measurement method and flowmeter, radar Doppler flow measurement method is increasingly being applied.

Technical Characteristics

1. Flow measurement range: 0.1m/s to 20.000m/s,

2. Accuracy of flow measurement: ± 0.02m/s

3. Resolution: 0.01m/s

4. Frequency range: 24 GHz

5. Radiated power: EIRP 20 dBm

6. Water level range: 0-12m.

7. Water level accuracy: 0.2% F.S

8. Flow range: 1 liter/second to 99999999 cubic meters/hour

9. Working temperature: 0-60 ℃

10. Fully enclosed design, meeting IP68 dust and waterproof requirements, high reliability

11. Distance measurement 6 °× 6 °/speed measurement 12 °× 24 °

12. Working power supply: external power supply 9-14VDC

Sensor installation method

The installation angle of the flow velocity sensor module is 30-70 degrees. The installation angle refers to the angle between the antenna plane of the flow velocity sensor module and the horizontal plane. In some uneven river flow environments, large angles are prone to jumping, and the smaller the installation angle, the better the suppression of rainfall interference and signal quality. It is recommended to install at an angle of about 50 degrees and a recommended installation height of 2-10m.

It is recommended to install the flow velocity sensor module facing upstream, with the water flow velocity close to the flow velocity sensor module and displaying a positive velocity. If there are strong reflective obstructions such as water or metal in the direction of radar transmission, it will seriously affect the effectiveness of radar testing.

Do not pull or shake the cable artificially, and do not collide with the sensor housing. Do not use connecting cables as load-bearing wires, use connecting cables to hang heavy objects. The cable must be fixed on the cement wall of the channel and cannot shake.

When extending the cable, the 485 output cable can be extended up to 200 meters using a 0.75 square millimeter two core shielded cable.