3 Cups Wind Speed Sensor Ultrasonic Sensor Weather Resistant High Accuracy Strong Pressure Resistance DC9 to 30V Item Type: Wind Speed Sensor Material: ABS Size: Approx. 158 x 180 x 70mm / 6.2 x 7.1 x 2.8in Power Supply Voltage: DC9-30V Signal Output: 0-5V Measurement Range: Wind speed 0-45m/s Extension Line Length: 0.8m Accuracy: ±(0.5+0.02V)m/s (V represents real time wind speed value) Resolution: 0.1m/s Starting Wind Speed: ≤0.8m/s Maximum Power Consumption: 0.48W Load Capacity: DC12V power supply, current output impedance ≤350Ω Voltage and Impedance: DC24V power supply, current output impedance: ≤900Ω, voltage output impedance ≥1KΩ Operating Environment: Temperature -35℃ to 60℃, humidity ≤100%RH without condensation Protection Level: IP64 Widely Used: Greenhouses, environmental protection, weather stations, ships, docks, aquaculture, advertising gate bars, meteorology, marine, environmental, airports, ports, laboratories, industrial and agricultural, and transportation environments for wind speed measurement. Weight: Approx. 272.00g / 9.59ozCalculation formula: 0-5V: F=V/5 A+B F: Represents the wind speed value, m/s; V: Sensor output voltage value, V; A: Sensor range width (upper range minus lower range); B: The minimum range value of the sensor (lower range limit); Wiring method (wire sequence is respectively): Red line:  power supply positive (output signal voltage) Black line: power supply negative (output signal voltage) Yellow line: signal (output signal voltage) Distribution diameter: Approx. 63mm / 2.48in Installation diameter: Approx. 3.2mm / 0.13in Aviation plug diameter: 15mm/0.59in (it is recommended to reserve 25mm for wiring, wire first, and then install and fix the sensor) Troubleshooting: 1. The wind blades do not rotate properly and have a large lag. Due to long term use, there may be foreign objects or jamming inside the bearing. Please send the sensor back to the company for processing; 2. The display value of the analog signal instrument is incorrect. Possible wiring issues or serial port failures may result in the inability to obtain correct data. Please check if the wiring is correct and secure, if the serial port is occupied, and if the serial port settings are correct;