MH - MF/MP wall-mounted ultrasonic open channel flow meter is a kind of high precision using the ultrasonic measurement of venturi channel or trough bashir's flow meters, its measuring sound waves bounce back after channels of access to the surface of the time, and then according to the formula to calculate the channel flow, it can provide flow output, according to the velocity and display the total flow, water level, this instrument and measuring weir trough with, mainly used to measure the free stream conditions within the channels of sewage flow, instrumentation, sensors and not be flow body contact, avoid the canal sewage contamination and corrosion, used to measure sewage flow, can be better than other forms of the instrument,With higher reliability.