Feature:1. USE PRINCIPLE: When the water passes through, the magnetic rotor rotates and the speed changes, the sensor outputs the corresponding pulse signal and feeds it back to the controller to judge the water flow.2. SENSOR SPECIFICATION: The water sensor has 3in male thread interface, the working voltage range is DC5-18V, and the output NPN pulse signal.3. EASY INSTALLATION: The water sensor is light in weight and small in size, with standard size and good sealing, easy to install and does not take up space.4. GOOD PERFORMANCE: The water flowmeter sensor is stable in operation, resistant to high temperature, and can be started at low water pressure, with strong practicability.5. MULTIPLE USAGES: Can be used in water heaters, credit card machines, water vending machines, measurement equipment, etc., with a wide range of applications.How to Use:Wiring: The red IN is connected to the positive pole, the yellow OUT is the signal output line, and the black GND is connected to the negative pole.Specification:Item Type: Water SensorMaterial: AluminumSurface Treatment: ElectroplatingOutput Signal: Output NPN Pulse SignalModel: YF -DN80Interface Size: 3in Male ThreadWorking Voltage Range: DC5-18VInner Diameter: Approx. 77mm / 3inOuter Diameter: Approx. 87mm / 3.4inThread Length: Approx. 21mm / 0.8inWater Pressure Resistance: 1.75MPaOutput Pulse High Level: >DC 4.5V (input voltage DC 5V)Output Pulse Duty Cycle: 50%±10%Load Capacity: ≤10mA (DC5V)Insulation Resistance: >100MΩFlow Range: 20~500L/MINAirtigh