Water flow sensor consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow. The hall-effect sensor outputs the corresponding pulse signal. This one is suitable to detect flow in water dispenser or coffee machine.
YF - S401 frequency: F = 98* Q (L/Min)
error: plus or minus 2%
voltage: DC3.5-12V, current should not exceed 10 ma, 5880 pulse output flow through a litre
The frequency calculation = constant flow rate (L/min) 98 * unit time (in seconds).
Flow range: 0.3-6l/min.