Feature: The water flow sensor is applied for water heater, imprinter, automatic water machine, and other flow metering equipment. With stainless steel ball inside of the impeller, wear-proof Up and down structure stress applied for the seal , avoid to leak with imported Hall element, and adopt pouring sealant encapsulation to avoid to leak and age Install vertically, angle of inclination should not be exceeded 5 degree Medium temperature should not be exceeded 120degree Wiring: Red - In - Connect positive Yellow - Out - Signal output Black - GND - Connect negative Technical Parameters: Working range: 0.3-6L/min Water pressure: ≤0.8MPa Minimum rated working voltage: DC4.5 5V-24V Maximum working current: 15 mA（DC 5V） Working voltage range: DC 5～18 V Load capacity: ≤10 mA（DC 5V） Operating temperature range: ≤80℃ Operating humidity range: 35%～90%RH (no frost) Storage temperature: -25～+ 80℃ Storage humidity: 25%～95%RH Size (L x W x H): Approx. 5.8 x 3.4 x 2.7cm / 2.28 x 1.34 x 1.06 inch Output interface diameter: Approx. outer 7mm, inner 3mm Package Includes: 1 x Water Flow Sensor Switch Meter Flowmeter Coffee Dispenser Counter