Features: To prevent particles and sundries from entering the sensor, a filter screen must be installed at the sensor inlet. The water flow sensor shall be installed inside the equipment or indoors, and shall not be exposed outdoors or wet for a long time-under high temperature and other harsh environments, the installation of water flow sensor must avoid the environment and application of vibration and shaking so as not to affect the measurement accuracy of the sensor. When the magnetic material or the material that generates magnetic force to the sensor close to the sensor, its characteristics may occur change. Do not disassemble the water flow sensor without authorization to prevent damage. Any water flow sensor disassembled without authorization not in the scope of-warranty. This structural sensor has not been used, and there may be discomfort when used for direct replacement, please put forward. Package Includes: 1x Flowmeter Specifications: Interface Size: 4 points (G1/2) Working Voltage: DC3.5-24V Outer Diameter: 20.3mm Thread Length: 11mm Material: Brass Water Pressure Resistance: 1.75MPa Output Pulse: High LevelDC4.7V (input voltage DC5V) Output Pulse: Duty Cycle 50%10% Flow Range: within 1-25LIMIT3% Working Water Flow Range: 1-25L/MIN3% Flow-Pulse Characteristic: 11x0) =L/Min3% Size: Approx. 2.2x6.6cm/0.87x2.60in note: Severe impact and chemical-erosion are strictly prohibited. Strictly prohibited to throw, move or collision. Vertical installation, with a gradient of no more than 5. The medium temperature should not exceed 120. Wire Method: Red IN connected to positive pole. Yellow OUT signal output line. Black GND connect to negative pole.