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How does a Doppler ultrasonic flowmeter measure water flow rate? What is the principle of measurement?
Doppler ultrasonic flowmeter is a contact measurement device widely used for flow measurement in sewage, wastewater, rivers, channels, reservoir discharge and other scenarios. Its measurement of water flow is mainly divided into three steps, and the measurement principle is based on the Doppler effect difference and velocity area method. Specifically, the flow velocity measurement principle is as follows: Based on the Doppler effect, the Doppler flowmeter probe emits a beam of ultrasonic waves obliquely upwards. When the ultrasonic waves propagate in the fluid, they will be reflected by impurities such as bubbles or particles contained in the fluid.. Due to the fact that these impurities can be considered to be consistent with the water flow velocity, the reflected ultrasound will produce a Doppler frequency shift Δ f, which is proportional to the flow velocity. Process: By measuring the Doppler frequency shift Δ f, the flow velocity V of the fluid can be calculated based on its proportional relationship with the flow velocity. Water level measurement and flow area calculation. Water level measurement: Use a pressure type water level gauge to measure the water level H. Flow area calculation: Determine the flow area S based on the pre collected cross-sectional data of the river or channel (i.e., the correspondence between water level and cross-sectional area data), combined with the measured water level H. Flow calculation method: Use the velocity area method to measure the flow, and the flow rate formula of the fluid is Q=V × S, where V is the flow velocity, S is the flow area, and Q is the instantaneou
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2. What are the winning bidders for ultrasonic Doppler flow meters?
The main winning bidders for ultrasonic Doppler flow meters are as follows:
1. Main winning bidders - Shanghai Zhonghe Weisi Automation System Co., Ltd. - Shandong Sidate Measurement and Control Equipment Co., Ltd. - Shanghai Zhenjiang Qiaolan Instrument Technology Co., Ltd. - Shanghai Eko Measurement and Control Technology Co., Ltd. 2 Technical parameter comparison: If you need to understand specific product differences, you can provide the following key parameter comparisons: Measurement accuracy: generally up to ± 1% FS Applicable pipe diameter: DN15-DN6000 Output signal: 4-20mA/RS485 3. Industry application The above enterprise products all cover the fields of municipal water affairs and industrial process monitoring before collision, among which Shanghai Eco has special technical patents in high corrosive medium measurement. Note: The data is sourced from the 2023 public bidding information and the enterprise lead cleaning technology white paper.
3. What type of flowmeter should be used for flow monitoring in municipal drainage networks?
It is recommended to use Doppler ultrasonic flow meters (also known as ultrasonic Doppler flow meters or sewer flow meters) for monitoring the flow of municipal drainage pipe networks. The specific analysis is as follows: the reasons for application are that municipal drainage pipe networks have characteristics such as large flow changes, complicated flow patterns, poor water quality, and poor equipment installation enviro
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