The water flow sensor is applied for water heater, imprinter, automatic water machine, and other flow metering equipment.
With stainless steel ball inside of the impeller, wear-proof
Up and down structure stress applied for the seal ring, avoid to leak
with imported Hall element, and adopt pouring sealant encapsulation to avoid to leak and age
Install vertically, angle of inclination should not be exceeded 5 degree
Medium temperature should not be exceeded 120degree
Wiring:

Red - In - Connect positive
Yellow - Out - Signal output
Black - GND - Connect negative
Technical Parameters:

Working range: 0.3-6L/min
Water pressure: ≤0.8MPa
Minimum rated working voltage: DC4.5 5V-24V
Maximum working current: 15 mA（DC 5V）
Working voltage range: DC 5～18 V
Load capacity: ≤10 mA（DC 5V）
Operating temperature range: ≤80℃
Operating humidity range: 35%～90%RH (no frost)
Storage temperature: -25～+ 80℃
Storage humidity: 25%～95%RH
Size (L x W x H): Approx. 5.8 x 3.4 x 2.7cm / 2.28 x 1.34 x 1.06 inch
Output interface diameter: Approx. outer 7mm, inner 3mm