Light weight, small size, easy to install. Inlaid with stainless steel impeller shaft, durable portable. Seal seal with superior strength structure and bottom never leak. Mainly used for water heater, water machine, card machine, various types of water filling and control equipment < p>Model: YF-S201 Black color Material: PVC The water flow sensor is composed of a valve body made of plastic, a water rotor and a Hall effect sensor. When water flows through the rotor, it rolls. Its speed changes with different flow rate. The Hall effect sensor outputs the corresponding pulse signal. Application: Mainly used for water heater, water machine, card machine, various types of water filling and control equipment Features: Light weight, small size, easy to install. Inlaid with stainless steel impeller shaft, durable portable. Seal joint with the upper and lower strength structure does not never leak. Precautions: Non-violent shock and chemical erosion. No throwing or knocking. Vertically mounted, do not should not exceed 5 degree inclination. The temperature of the medium should not exceed 120C Cord connection: Red: positive (+ ); yellow: signal output; black: negative (-) The lowest rated working voltage: DC4.5 5V-24V. Maximum working current: 15mA (DC 5V). Operating voltage range: DC 5 ~ 18 v. Load capacity: