Features USE ENVIRONMENT: The sensor flow range is 0.2-8L/min, with good pressure resistance, and the operating temperature does not exceed 80 degrees. 3P CONNECTION: The water flow sensor is 3 wire design, the red wire is positive pole, the black wire is negative pole, and the yellow wire is a pulse signal. GOOD WATERPROOF: Hall element waterproof design, excellent material inlaid inside the impeller, wear resistant and durable, greatly prolong the service life. COMPACT SIZE: The water flow sensor is small in size and light in weight, easy to install and takes up less space, has a wide range of applications. MULTIPLE USAGES: With G1/4in PE pipe interface, standard in size, widely used in water heaters, water dispensers, etc., can be used as a flow switch. Specification: Item Type: Water Flow Sensor Material: POM Interface Size: G1/4in PE pipe Voltage Range: DC3.5-24V Inner Diameter: Approx. 6.5mm / 0.26in Flow Range: 0.2-8L/min Pulse Frequency: F=(18xQ)±5% Withstand Pressure: ≤1.75map Output Pulse High Level: ≥DC4.6V (input voltage DC5V) Output Pulse Low Level: ≤DC0.5V (input voltage DC5V) Maximum Operating Current: 15mA (DC5V) Operating Temperature Range: ≤80℃ Package List:1 x Water Flow Sensor Note:A filter must be installed at the entrance of the sensor to prevent particles and debris from entering the sensor. Package List 1 x Water Flow Sensor