The common method of measuring flow through an open channel is to measure the height or HEAD of the liquid as it passes over an obstruction (a flume or weir) in the channel. Using ultrasonic level technology, Open channel flow meters include a non-contacting sensor mounted above the flume or weir. By measuring the time from transmission of an ultrasonic pulse to receipt of an echo, the water level or “Head” is accurately measured.
Flumes and weirs are specially designed channel shapes that characterize the flow of water. Common types are Rectangular Weirs, V-Notch Weirs, Parshall flumes and Palmer Bowlus flumes. The choice of flume or weir type depends on the application: flow rate, channel shape and solids content of the water.
- Measure Flow rate using Level Sensors
- Weirs and Flumes Flow Measurement
- Area Velocity Flow Meter Principle
- Interview Questions on Differential Pressure Flow Transmitter
- DP Type Level Measurement at transmitter installed below tapping point for open tank
- DP Type Level Measurement at transmitter installed above tapping point for open tank
- Cable Float Level Switch Working Principle
- Air Purge or Air Bubbler Level Measurement
- Advantages & Disadvantages of Different Flow Meters
- Applications of Temperature Scanner