The difference between mono and three channel ultrasonic flowmeters is the transducer
Yes, 3 channels, 6 transducers. Under reasonable distribution, the more sound channel, the higher precision, but the data processing requirements of the software is higher.
The difference seems to be the number of transducers, in fact, multi-channel ultrasonic flowmeter, a lot of accuracy. In software and hardware design, it is also very different.
The three channel is the 6 transducer