Description: This water flow sensor is mainly composed of plastic valve body, water flow rotor component and hall sensor. The impeller is embedded with a stainless steel shaft which is wear-resistant. Sealing ring adopts upper and lower mechanical structure and never leak. Hall elements were imported from and sealed with the pouring sealant to prevent water inlet. Never aging. All materials conform to the ROHS test standard. It is installed in the water heater to detect the inflow of water. When water passes through the rotor component, the magnetic rotor rotates and the rotational speed changes as the flow changes.Hall sensor outputs corresponding pulses signal, feedback to controller. Controller control the water flow. Fitment: water heater, water vending machine, water dispenser, water fountain, flow measurement device, etc. Specification: Maximum working current: 15 mA (DC5V) Working voltage range: DC5~18 v Load capacity: ≤ 10 mA (DC5V) Wokring temperature: ≤ 80 ℃ Working humidity range: 35%~90%RH (no frost) Allowing pressure: pressure 1.75Mpa Strorage temperature: -25~+80 ° c Storage humidity: 25%~95%RH Wiring method: Red IN for positive pole, Yellow OUT for signal output line, Black GND for negative line. Material: stainless steel Size(LxWxH): approx. 45x25x25 mm / 1.77x0.98x0.98 inch Wire Length: approx. 35cm/13.77inch Package Includes: 1 piece water flow sensor