Single point Doppler flowmeter

1、 Introduction

Single point Doppler flowmeterIt is a flow velocity and flow rate detection instrument applied to working conditions such as rivers, open channels, and pipelines. It adopts ultrasonic detection technology, with high measurement accuracy, high stability, little influence from environmental factors, no rotating parts, low maintenance frequency, and high work reliability. It is a product for online and portable measurement.

2、 Principle

Single point Doppler flowmeterPrinciple: When the ultrasonic sound source and the observer make relative motion, the frequency received by the observer is different from the frequency of the ultrasonic sound source. Therefore, compared to the small particles and bubbles that move with water in ultrasonic transducers, the frequency received by the transducer will also change, and it will increase with the increase of suspended motion velocity in water. Therefore, the Doppler frequency shift can be measured and converted to obtain the flow velocity of the water where the Doppler flowmeter is located. Multiply by the cross-sectional area of the channel to obtain traffic information.

Because the speed of sound propagation in water is closely related to water temperature, Doppler principle requires obtaining the speed of sound propagation in water for velocity measurement. Therefore, the device is equipped with a temperature sensor for temperature measurement, which in turn corrects the sound velocity. The liquid level depth measurement adopts a diffusion silicon pressure sensor to measure the distance between the position of the flow rate sensor and the liquid level.

3、 Characteristics

Using Modbus communication protocol and RS485 bus for communication

The installation of underwater sensor equipment is convenient; There is a metal base fixing device, easy to install

All equipment adopts electronic design, wide voltage power supply, low power consumption, and no mechanical components

It has the advantages of accurate and stable measurement, high reliability, and strong anti-interference ability

Widely applicable, it can be used in various water environments ranging from tap water to Yellow River water

4、 Technical parameters

Measurement types: point flow rate, liquid level, temperature, flow rate

Display: Instrument 12964 LCD display

Optional: Optional built-in ultrasonic level gauge and conductivity sensor

Measurement method: online

Measurement principles: Acoustic Doppler method, velocity area method

Flow rate: Range: 0.021m/s to 6.00m/s, Accuracy: ± 1.0% ± 1cm/s

Water level: Range: 0.03m~5m (customizable 10m) Working depth: 0.1~5m

Instantaneous flow range: 1L/s to 99.99 m ³/s

Cumulative flow range: 0.1m ³~999999m ³ Operating voltage: DC12-18V

Power consumption (DC12V): 1-3W

Data update cycle: 6s to 60s (adjustable)

Protection level: IP68

Output signal: Modbus RS485

Output signal content: point flow rate, instantaneous flow rate, water level, temperature

Liquid pressure requirement: 1 standard atmospheric pressure under natural environmental conditions

Reliability MTBF:>25000 hours

5、 Composition and dimensions of ultrasonic open channel flowmeter

1. Composition of instruments

The instrument is mainly divided into two parts: the host and the flow rate sensor

2. Appearance dimensions of the instrument

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