open channel flow meter types

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whatsapp:008618049841995

Open channel flowmeter is an instrument used to measure the flow of water in open channels (such as rivers, irrigation channels,

 drainage ditches, etc.). According to its measurement principle, structure and application characteristics, open channel flowmeter

 can be divided into many types. The following are some common types of open channel flowmeters:

1. Classification by measurement principle

Ultrasonic open channel flowmeter

Principle: Use the propagation time difference or phase difference of ultrasonic waves in the air to measure the water surface 

height (liquid level), and combine the geometric dimensions of the channel (such as width, slope, etc.) to calculate the flow.

Features: Non-contact measurement, easy installation, suitable for a variety of channel shapes and flow ranges.

Technical parameters: wide measurement range, such as 0.1m³/h-99999.99m³/h (determined by different weirs); high liquid level 

measurement accuracy; with a variety of power supply methods, such as 220V/24V/12V, battery power supply, solar power supply, 

etc.; high protection level, such as display instrument IP66, probe IP68.

Doppler open channel flowmeter

Principle: Using the principle of Doppler effect, by transmitting and receiving ultrasonic signals reflected by tiny particles (such as 

suspended matter and bubbles) in the water flow, the movement speed of these particles is measured, so as to deduce the average

 speed of the water flow, and then calculate the flow rate in combination with the channel cross-sectional area.

Features: Suitable for measuring fluids containing solid particles or bubbles, with high measurement accuracy.

Technical parameters: wide water level measurement range, such as 0.02~3m, 0.02~10m; wide flow rate range, such as 0.03m/s~5.0m/s;

 high measurement accuracy of the whole machine, such as system error ±3‰.

Multi-channel open channel flowmeter

Principle: Use multiple channels to measure water flow velocity at the same time, and improve measurement accuracy through data

 processing.

Features: High measurement accuracy, suitable for occasions with high measurement accuracy requirements.

Technical parameters: high flow rate measurement accuracy, such as 1.0%; wide flow rate range, such as ±10m/s; large channel width 

measurement range, such as 0.5~10 meters for time difference method.

2. Classification by installation method

Insertion open channel flowmeter

Features: Usually composed of measuring tube and measuring head, it can be easily installed in existing pipelines and adapt to fixed 

pipelines of various calibers.

Fixed open channel flowmeter

Features: It consists of measuring slot and measuring head, with high measurement accuracy and stability, so it is more suitable for 

large-scale water conservancy projects and important water supply areas.

3. Classification by measuring medium

Liquid open channel flowmeter

Composition: It consists of pipeline, weir, timer, etc., and is divided into closed and open types according to the type of liquid. The

 closed type is suitable for measuring liquids with higher viscosity, and the open type is suitable for measuring liquids with stronger 

fluidity.

Gas-liquid open channel flowmeter

Composition: It consists of pipeline, throttling device, pressure sensor, etc., and is divided into constant temperature difference and 

mass flowmeter according to the different types of measured gas.

If you want to buy an open channel flowmeter and want to know the specific selection and quotation, please consult winny:

Email:sales01@cxflowmeter.com

whatsapp:008618049841995