Water flow sensor consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow. The hall-effect sensor outputs the corresponding pulse signal. This one is suitable to detect flow in water dispenser or coffee machine. FeaturesCompact, Easy to InstallHigh Sealing PerformanceHigh Quality Hall Effect SensorRoHS Compliant SpecificationsMini. Wokring Voltage: DC 4.5VMax. Working Current: 15mA (DC 5V)Working Voltage: DC 5V~24VFlow Rate Range: 2~100L/minLoad Capacity: ≤10mA (DC 5V)Operating Temperature: ≤80℃Liquid Temperature: ≤120℃Operating Humidity: 35%～90%RH Water Pressure: ≤1.75MPaStorage Temperature: -25～+ 80℃Storage Humidity: 25%～95%RH DocumentsMechanic Dimensions British Standard Pipe (BSP)Water Flow rate display on LCDHow Magnetic Reed Liquid Level Sensors WorkReading Water Flow rate with Water Flow Sensor