Features: Designed for professionals in different fields, the flow meter is suitable for use by engineers, technicians. Its compact structure, high reliability, and wide of applications make it a versatile tool. Quality material, stable performances, has long service life. Widely applicable for landscape irrigation, water plant, district traffic control, etc. The water flow sensor is composed of body, water flow rotor assembly and Frosted sensor. Installed in the water heater input end, used to detect the input flow rate, when the water through the flow rotor assembly, the magnetic rotor rotate and speed changes with flow rate, Hall sensor output the corresponding pulse signal, feedback to controller, by controller to determine the size of the water flow and control. Specifications: Material: Nylon Interface: 1.25'', DN32 Voltage: 3.5-24VDC Inner Outer Diameter: 30mm/41.5mm Thread: 26mm Frequency: F＝0.45xQ(L/Min) Current: Less Equal to 10MA(DC5V) Flow Ranges: 2-120L/Min±2% Working Temperature: Less Than 80℃ Working Humidity: 35%-90%RH(without Frosted) Pressure Resistant: Lower Than 1.75MPA Wiring Method: RED IN to Positive, YELLOW OUT to Signal Output, Black to Negative Size: Approx. 12x7.3x5.1cm/4.72x2.89x2in Package Includes: 1x Flow Meter note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.