News

Your current location: Home > News

How to Choose Ultrasonic Open Channel Flow Meters

December 19, 2022

Ultrasonic open channel flow meter is an ideal device for monitoring the flow of channels and rivers. Generally for the measuring range, we have 1m and 2m types. Then how to determine its range and what we should note when installing?Today we will explain in details.

First let's see how many different shapes and types of channels and weirs we have.

Triangle weir Rectangular weir Trapezoidal weir Parshall flume Parabolic weir Channel without weir

differential shapes of channels and weirs

 

No.1. Triangle weir

Choose the open channel flow meter with 1m range. The triangle weir can be made of FRP, PVC or stainless steel.

1. The weir should be smooth, flat without distortion;

2. The triangular lip platform should be straight and smooth;

No.2. Rectangular weir

Choose the open channel flow meter with 2m range. The rectangular weir can be made of FRP, PVC or stainless steel. Note the following:

1. The weir should be smooth, flat without distortion;

2. The triangular lip platform should be straight and smooth.

No.3 Trapezoidal weir

Choose the open channel flow meter with 2m range.

No.4, Parshall flume

For Parshall flumes 1 to 4, choose the open channel flow meter with 1m range; For Parshall flumes 5 to 25, choose the open channel flow meter with 2m range.

No.5, Parabolic weir

1m or 2m range can be selected.

No.6. Channel without weir

Prerequisites for Measurement of Channels Without Weirs

1. Sufficient slope is required between upstream and downstream. If the water is blocked upstream, the water in the channel will flow away naturally, and there will be no accumulation of water in the channel. Standing water 1 to 2 cm deep is negligible.

2. Downstream water will not flow back.

3. There are 10 times straight channels upstream of the installation point and 5 times straight channels downstream.

4. Stones, aquatic plants, garbage and other debris within the range of 5 times the straight channel upstream and downstream of the installation point should be cleaned up.

For more technical documents and solutions for flow monitoring, contact Holykell.