Do ultrasonic open channel flowmeters have to be equipped with weirs?

What weirs can be equipped with an ultrasonic open channel flowmeter? 
Information that should be considered including the size of the flow in the channel, the flow pattern of the water in the channel, whether it can constitute a free flow. In layman's terms,
after the water flows through the weir, there is a satisfying drop, it will flow away freely, it will not stay in the downstream, and the downstream water will not be full.
1. The maximum flow rate of ultrasonic open channel flowmeter is less than 40 liters/second (144 tons/hour). It is recommended to use right-angled triangular weir; 
2. When it is greater than 40 liters/second, it is recommended to use Parshall trough; 
3. The upstream path is shorter and the maximum flow rate is more than 40 liters/second recommend ectangular weir. 
4. The reference zero point must be calibrated first when using the instrument to measure. The reference zero point is the interval between the probe and
the zero point of the weir trough water level.
There is another way for ultrasonic open channel flowmeters to reduce your worries, that is, it does not need to be equipped with weirs for measurement. 
However, the following prerequisites must be met:
1. There is a satisfactory drop between the upstream and downstream, the upstream gate is closed, there is no water flowing down, the downstream has no water or the water level is negligible.
2. Install at the first 10 times and then 5 times the width of the path, and the water flow should be gentle and the horizontal plane should be relatively stable.
3. The waste, floating objects, stones, and water plants in the way before and after the installation place should be cleaned up, generally within 3 to 5 meters.


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