WATER FLOW SENSOR YF-S401:
With this sensor you can easily measure the flow of liquids (water).
The sensor has a 7mm coupling on both sides and is therefore easy to connect to a 6mm hose.
The output of the sensor gives 98 pulses per second with a duty cycle of approximately 50% for each liter of fluid passing through per minute: Q [L/min] = fpulse [Hz]/98.
Voltage range: 5-24V
Pulse frequency per L/min: 98Hz
Measuring range: 0.3-6L/min (with an accuracy of +-10%)
Maximum water pressure: 0.8MPa
Working temperature: -25-80oC
Duty cycle pulse: 50% +-10%
Voltage pulse (with 5V as input voltage): 4.7V
Dimensions: See images
Red: Vcc/plus (5-24V)