Doppler flow sensor

1. Product principle of Doppler flow velocity sensor :

Doppler flow sensor, also known as Doppler flow meter, is a device used to measure fluid flow velocity and is widely used in water conservancy monitoring, environmental monitoring, weather forecasting and other fields. In the field of acoustics, when there is relative movement between the sound source and the receiver (i.e., the probe and the reflector), the frequency of the echo will change. This change in frequency is called a frequency shift, or the Doppler effect. The frequency of sound waves becomes higher as it moves toward the observer and becomes lower as it moves away from the observer. A Doppler flow meter calculates flow velocity by calculating changes in frequency.

2. Technical parameters of Doppler flow velocity sensor

1. Power supply: DC10-15V

2. Working current: about 10mA in standby, 60mA in measurement

3. Sound wave frequency: 2MHZ

4. Blind area: 10 cm

5. Flow velocity range: 0.02-10 meters/second

6. Water depth range: 0.02-5 meters

7.Temperature: 0-50°

8.Measurement period: 20 seconds

9. Sensor material: ABS, stainless steel

10.Output interface: RS485

11. Working water depth: 0.2m-5m

3. Doppler flow velocity sensor installation instructions:

Normal installation must be 20CM below the lowest water level to avoid exposure to water.

Sensor installation instructions:

4. Precautions for Doppler flow velocity sensor

1. The sensor needs to avoid mud and collision with stones and other objects. In areas with a lot of aquatic plants, grilles need to be installed to avoid entanglement of aquatic plants.

2. Sensor installation direction, the sensor emission surface needs to be installed in the direction of the flow.

3. The sensor has an acoustic blind zone. Try to ensure that the sensor is below 20 cm underwater (the sensor may be half-exposed underwater or blocked by sludge. False data may appear. The probability is very low. Usually the data will appear in large numbers, such as more than 2 meters/second. , it is recommended that secondary developers using sensors can block large flow velocity values based on the water level, or in actual applications where the water flow rate is not that large, they can directly block flow rates greater than 2 meters).

4. The cable vent pipe is not difficult to break and affects the water level measurement.

5. Try to do a good job in signal and power lightning protection.

6. If the sensor cable is long, you need to add a 485 relay to avoid interference from the frequency converter.