SN AQUA series SNA-TF are turbine flow transmitter specially used for various industrial applications. The flowing media engages a vane rotor causing it to rotate at an angular velocity proportional to flow rate. The pickup coil senses the spinning motion of the rotor inside the pipe & converts it into a pulsating electrical signal. Summation of the pulsating electrical signal is directly related to the total flow. The frequency is linearly proportional to flow rate which is converted to electrical signal to 4 to 20mA.