Product Introduction:
The Doppler ultrasonic flow meter is a sensor that uses the Doppler effect principle of ultrasound to measure the flow rate of water. It transmits high-frequency ultrasound through the transmitting probe (ultrasonic transducer). The ultrasound is reflected when it encounters particles or bubbles in the water. The reflected ultrasound is received by another probe (ultrasonic transducer). The flow rate can be calculated by measuring the frequency difference between the transmission and reception. There is no drift in the measurement data, and no calibration is required for long-term operation.
Digital measurement, no drift, simple installation and operation, easy to manage, can provide a complete set of solutions, including power supply system, data acquisition terminal, data cloud platform.
Typical applications:
Channels and rivers, urban drainage networks, rainwater and sewage networks, factory sewage, irrigation channels, irrigation area informatization, smart city drainage monitoring, etc.
Product images:
Key Features:
Internally integrated pressure water level gauge, no need for external water level gauge, achieving integrated monitoring of water level, flow rate, and water temperature;
Standard RS485 interface, long communication distance;
The flow rate range can be configured to achieve the best match between sampling accuracy and speed;
The accompanying configuration program makes debugging and configuration easier;
The measurement accuracy of flow velocity is high, and there is no drift, no need for calibration;
IP68 waterproof rating ensures the reliability of underwater operation;
Compact size, easy installation, and less obstruction to water bodies;
Can be paired with our company's telemetry terminal to achieve remote data transmission, while providing a free platform to view data;
Technical parameters:
Power supply range
DC 12V/24V (maximum DC 6-28V) Recommended DC12V
Working current
<45 mA @ DC12V 25℃①
working temperature
0℃~60℃
Storage temperature
-40℃~85℃
Flow velocity range
0-12m/s (adjustable range 0-4m/s; 0-6m/s; 0-8m/s; 0-12m/s) ②
Flow velocity accuracy
1% (accuracy within 1m, 1cm/s)
Flow velocity resolution
1mm/s
Depth range
0-10m
Depth accuracy
±0.5%
Depth resolution
1mm
Water temperature range
0℃~60℃
Water temperature accuracy
±0.5℃
Waterproof grade
IP68
Working power consumption
<0.5W @DC12V
Power protection
Anti reverse connection protection, electrostatic discharge protection
Extreme working temperature
-30℃~70℃
communication interface
RS485 interface (baud rate 9600,8, N, 1), effective transmission distance 1000m (>300m requires an external connection of 150)
Matching resistor ③
Communication Protocol
Standard Modbus RTU protocol, function code
Compensation method
Sound speed compensation, user parameter compensation
Ultrasonic frequency
1MHz±30Hz
Features:
Internally integrated pressure water level gauge, no need for external water level gauge, achieving integrated monitoring of water level, flow rate, and water temperature;
Standard RS485 interface, long communication distance;
The flow rate range can be configured to achieve the best match between sampling accuracy and speed;
The accompanying configuration program makes debugging and configuration easier;
The measurement accuracy of flow velocity is high, and there is no drift, no need for calibration;
IP68 waterproof rating ensures the reliability of underwater operation;
Compact size, easy installation, and less obstruction to water bodies;
Can be paired with our company's telemetry terminal to achieve remote data transmission, while providing a free platform to view data;
On-site case:
Measuring principle:
Depth measurement principle : The flow meter is integrated with a pressure water level gauge, which can measure the water pressure. The water depth can be calculated by the formula: p=ρgh (p: absolute water pressure, ρ: density, g: gravity acceleration; h: water depth); the equipment cable is internally connected to an air pipe, one end of which is connected to the pressure sensor, and the other end is connected to the air. In this way, the pressure sensor can be connected to the air through the air pipe, and then the air pressure can be measured to calculate the absolute water pressure. Since water pressure = absolute water pressure + atmospheric pressure, and the atmospheric pressure is changing;
Speed measurement principle : There are two ultrasonic transducers at the front end of the flow meter, one converts electrical signals into ultrasonic signals, and the other converts received ultrasonic signals into electrical signals; the flow meter transmits an ultrasonic signal of fixed frequency into the water body through one transducer, and the suspended matter and bubbles in the water will reflect the ultrasonic signal, and the received ultrasonic signal is converted into an electrical signal through another transducer, and then the received signal is processed and filtered, and finally processed by the internal DSP chip to calculate the frequency difference between the transmitted and received signals. This frequency difference is the frequency shift caused by the Doppler effect, and the magnitude of this frequency shift is proportional to the relative speed of the object, that is, the movement speed of the suspended matter and bubbles in the water body. Since these suspended matter and bubbles are small enough, it can be considered that the speed of these suspended matter and bubbles is the speed of the water flow, and the flow rate of the water body is obtained by measuring the speed of the suspended matter or bubbles.
