Features of ultrasonic open channel flowmeter:

      1. When the liquid level is lower than the lowest sound channel, it can be measured as a weir trough flow meter (a function of liquid level and flow rate).

      2. The cross-section of the measured canal (pipe, culvert) is not restricted, and the width of the measured canal can reach hundreds of meters.

      3. Since the flow rate is calculated by actually measuring the flow rate and liquid level (cross-sectional area), it is more accurate than the weir, trough, and channel flowmeters that only measure the liquid level.

      4. Multi-channel measurement can be realized, and the measurement accuracy increases with the increase in the number of channels actually involved in the measurement.

     The installation of ultrasonic open channel flowmeter should pay attention to the following issues:

     1. When the on-site straight section is insufficient, it is necessary to compensate the influence of the oblique flow on the accuracy of the flow velocity measurement by setting the sound channel at the intersection of the measurement section.

     2. The measured flow velocity is based on the premise that the channel flow pattern is relatively uniform, that is, the length of the straight section of the channel (pipe) is required to meet the requirements.

     3. If there are weirs, gates and other facilities before and after the on-site measurement section to make the vertical flow turbulent, the multi-channel measurement method should be used to accurately measure the average flow velocity of the surface.

     The number of sound channels and the height of sound channels are determined according to the requirements of measurement accuracy, and the minimum water level, the maximum water level and the working water level must also be considered.

     4. For channel flow meters, it is important to accurately measure the flow rate and water level, but the error of the channel cross-sectional area is often the biggest influence on the flow measurement.

   (For example, errors such as sedimentation at the bottom of the canal, uneven canal walls, inconsistent canal widths, etc.). Therefore, it is particularly pointed out here that the control of the channel cross-sectional area error must require the channel civil construction to be accurately constructed according to the design.