Features： 1、For Flow Control: When the water passes through the water flow rotor assembly, the magnetic rotor rotates and the speed changes with the flow rate. The Hall sensor outputs the corresponding pulse signal and feeds it back to the controller to judge the size of the water flow and adjust it. 2、Water Flow Meter: Mainly consisted of a valve body, a water flow rotor assembly and a Hall sensor. 3、Wide Application: Can be used for water heater, credit card machine, water vending machine and so on. 4、Stable Working: Resistant to high temperature, enables stable working as well as low pressure starting. 5、Easy to Install: Designed to have a light weight and a small size, very easy to store and install. Specification： Item Type: Water Flow Sensor Output Signal: Output NPN pulse signal. Model: YF-B10 Interface Size: 1.3in british system male external thread. Inner Diameter: Approx. 24.38mm / 1in Outer Diameter: Approx. 32.9mm / 1.3in Thread Length: Approx. 13mm / 0.5in Material: Brass Water Pressure Resistance: >1.75MPa Output Pulse Duty Cycle: 50%±10% Load Capacity: ≤10mA (DC5V) Insulation Resistance: >100MΩ Flow Range: 2~50 L/min ± 5% Tightness: Close each hole, add 1.7Mpa water pressure test for 1 minute, no leakage and deformation. Flow Pulse Characteristics: F=(8xQ-4)±5%, F is frequency, Q is L/Min. Package List： 1 x Water Flow Sensor