Water flow sensor is mainly consists of plastic body, rotor assembly and hall current sensor. It is installed in the hot water inlet end for detecting water flow. When water through the flow rotor assembly, magnetic rotor will rotate and will change as the flow change. Hall current sensor output corresponding pulse Signal and feedback to controller, then the controller will control the flow. Can be used for water heaters, credit machines, water vending machine, flow measurement device. Features - The water flow sensor for water heater, imprinter, automatic water machine, and other flow measuring systems applied. - With stainless steel ball inside the impeller, wear-resistant. - Applied to and from structural stress for the sealing ring, avoid licking with imported hall element, and to adopt pouring sealant to avoid encapsulation to lick, and age. - Install vertical, the tilt angle should not be exceeded 5 degrees. - Medium temperature should not exceed 120degree. Cord Connection - Red: Positive(+) - Yellow: Signal output. - Black: Negative(-) Specifications - Workspace: 0.3-6L / min - Water pressure: le; 0.8 MPa - Minimum nominal operating voltage: DC4.5 5V - 24V - Maximum Operating Current: 15 mA (DC 5V) - Working voltage range: DC 5 - 18V - Load capacity: le; 10 mA (DC 5V) - Operating temperature range: le; 80 - Humidity range: 35% - 90% RH (no frost) - Storage temperature: -25 - + 80 - Storage humidity: 25% - 95% RH - Size (L * W * H): Approx 5.8 * 3.4 * 2.7 cm - Output interface diameter: Ca. Outside 7mm, inside 3mm