The UB-Flow AV is a Doppler sensor which aims to monitor average velocity in sewer networks (between -1 and 4m/s). This sensor measures precisely very low velocities and starting from 30mm water depth, including in low particle laden water. In addition to the average velocity, other information are given to guide the user in the flow rate estimation, such as standard deviation, minimal and maximal measured velocities, and to estimate the measurement quality, such as Doppler quality and echo quality indicators.

The fast booting time and fast measurement acquisition time allows to reach an autonomy on battery of more than a year.

An accelerometer gives pitch and roll angles to check the right orientation of the device (+/-1°). A temperature sensor gives a value in °C (+/- 1°C) of the environment temperature around the sensor.