Why Use an Open Channel Flow Meter?
An open channel flow meter is used when the liquid surface is exposed to the atmosphere, or when the pipe is not completely full. In these applications, conventional full-pipe flow meters may not work properly, while an open channel flow meter can provide an effective and accurate solution.
What Is the Working Principle of an Open Channel Flow Meter?
Our open channel flow meter uses ultrasonic level measurement technology combined with a flume or weir to measure flow. The system consists of a non-contact ultrasonic level sensor and a specially designed flume or weir installed in the channel.
The ultrasonic sensor emits pulses toward the liquid surface and receives the reflected echo. By measuring the time between pulse transmission and echo reception, the system can accurately determine the liquid level, also known as the head height.
Once the weir or flume is installed, the ultrasonic level sensor is mounted above it to continuously measure the liquid level. Based on the measured level and the corresponding flow equation, the system automatically calculates the flow rate.
Common weir types include V-notch weirs, rectangular weirs, and trapezoidal weirs. Different flumes and weirs use different flow calculation formulas, so the appropriate structure can be selected according to the actual application.