Ultrasonic open channel flowmeter is a fully intelligent open channel flowmeter developed by our company with the most advanced technology at home and abroad. The product has the advantages of simple structure, convenient installation, good measurement accuracy and reliability, wide range ratio, etc. it can be used not only for the measurement of wastewater discharge, but also for the water measurement of farmland irrigation and the drainage reconstruction project in urban area. Ultrasonic open channel flowmeter is composed of three parts: Flow Totalizer, appropriate measuring weir slot and ultrasonic probe. The principle is that the ultrasonic probe can directly measure the change of the liquid level in the weir groove, and the change of the liquid level in the weir groove can be converted into the flow in the weir groove by the corresponding liquid level flow conversion of the flow totalizer.