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. We have a comprehensive line of water flow sensors in different diameters. Check them out to find the one that meets your need most. Feature: Compact, Easy to Install High Sealing Performance High Quality Hall Effect Sensor RoHS Compliant Transparent Specification： Mini. Wokring Voltage: DC 4.5V Max. Working Current: 15mA (DC 5V) Working Voltage: DC 5V~24V Flow Rate Range: 1~30L/min Flow Pulse: F(Hz)=(5.0*Q)±3% Q=L/Min Load Capacity: ≤10mA (DC 5V) Operating Temperature: ≤80℃ Liquid Temperature: ≤120℃ Operating Humidity: 35%～90%RH Water Pressure: ≤1.75MPa Storage Temperature: -25～+ 80℃ Storage Humidity: 25%～95%RH For any technical support or suggestion, please kindly go to our forum. TypeDimensions(DN)Working VoltageFlow Rate RangeLengthMale & FemaleLength of ThreadMaterial YF-B1 DN15 5V~15V(DC) 1~25L/min 44mm Double Male 10mm Copper YF-B2 DN15 5V~15V(DC) 1~25L/min 50mm Male in Female out 10mm Copper YF-B3 DN15 5V~15V(DC) 1~25L/min 66mm Double Male 18mm Copper YF-B4 DN15 5V~15V(DC) 1~25L/min 66mm Male in Female out 10mm Copper YF-B5 DN20 5V~15V(DC) 1~30L/min 50mm Double Male 10mm Copper YF-B6 DN20 5V~15V(DC) 1~30L/min 60mm Double Male 11mm Copper YF-B7 DN15 5V~15V(DC) 1~25L/min 66mm Double Male 10mm Copper G1&2 DN15 5V~24V(DC) 1~30L/min Double Male Plastic G3&4 DN20 5V~24V(DC) 1~60L/min Double Male Plastic G1&2 DN15 5V~24V(DC) 1~30L/min 60mm Double Male 13mm Plastic G1&8 - 5V~24V(DC) 0.3~6L/min - - - Plastic M11*1.25 - 5V~24V(DC) 0.3~6L/min - - - Plastic