The sensor is fitted with two energy converters, one for transmission, one for receiving. On the premise that the sensor is facing the water flow direction, i.e. countercurrent direction:

1.When water is static, the transmission and receiving frequencies are the same.

2.The faster the velocity is, the faster frequency the sensor receives signal, and it will be higher than transmission signal.

3.The slower the velocity is, the slower frequency the sensor receives signal, and it will be lower than transmission signal.

On the premise that the sensor is on the water flow direction, i.e. current direction:

1.When water is static, the transmission and receiving frequencies are the same.

2.The faster the velocity is, the faster frequency the sensor receives signal, but it will be lower than transmission signal.

3.The slower the velocity is, the slower frequency the sensor receives signal, but it will be lower than transmission signal.

Hardware and software can calculate water flow direction and velocity.

The sensor has to be installed facing the water flow direction