Ultrasonic Wind Speed and Direction Sensor CG-09 Multi-Element IoT Weather Station Online Investment Invitation ⊙ Product Overview The ultrasonic wind speed and direction sensor, also known as an ultrasonic anemometer, is a wind speed and direction measurement instrument developed based on ultrasonic principles. It uses transmitted sound wave pulses to measure the time or frequency (Doppler shift) difference at the receiving end to calculate wind speed and direction. This sensor can simultaneously measure instantaneous values of wind speed and direction, supporting signal outputs such as current, voltage, 485, and GPRS wireless internet. The entire unit's housing is made of ABS material, making it lightweight with no moving parts, requiring no maintenance or on-site calibration, and capable of outputting both wind speed and direction. It can be connected to computers, data collectors, or other acquisition devices compatible with RS485 or analog outputs. Ultrasonic Wind Speed and Direction Sensor ⊙ Basic Principle Ultrasonic wind measurement is an application of ultrasonic detection technology in gaseous media. It utilizes the effect of air flow (wind) on the propagation speed of ultrasonic waves in the air to measure wind speed. As an inertia-free measurement method, it accurately captures high-frequency components of gust fluctuations in natural wind. The speed of sound in air is superimposed with the airflow speed in the wind direction. If the propagation direction of the ultrasonic wave is the same as the wind direction, its speed increases; conversely, if the propagation direction is opposite to the wind direction, its speed decreases. Therefore, under fixed detection conditions, the propagation speed of ultrasonic waves in air can be correlated with the wind speed function. Wind speed and direction can be obtained through calculation. Since the speed of sound waves in air is significantly affected by temperature, the anemometer detects two opposite directions on two channels, making the influence of temperature on sound wave speed negligible. The ultrasonic wind speed and direction sensor uses four ultrasonic probes to cyclically transmit and receive ultrasonic waves in a two-dimensional plane, measuring wind speed and direction based on the time difference of ultrasonic propagation in the air. ⊙ Functional Features ◆ No starting wind speed required; operates at zero wind speed; 360° azimuth; simultaneously obtains wind speed and direction data. ◆ No moving parts, minimal wear. ◆ Utilizes acoustic phase compensation technology for fast response. ◆ Employs random error recognition technology, ensuring low discrete error even in strong winds for stable output. ◆ Engineering plastic housing, lightweight design, portable, easy to install and dismantle. ◆ Convenient signal access, supports both digital and analog signals. ◆ Requires no maintenance or on-site calibration. ⊙ Technical Parameters Wind Speed ◆ Measurement Range: 0–10 m/s, 0–30 m/s, 0–60 m/s ◆ Accuracy: ±(0.2 m/s ± 0.02*v) (v is the true wind speed) Wind Direction ◆ Measurement Range: 1–360° ◆ Accuracy: ±1° Air Temperature ◇ Measurement Range: -30°C to 70°C ◇ Accuracy: ±0.2°C ◇ Resolution: 0.1°C Air Humidity ◇ Measurement Range: 0–100% ◇ Accuracy: 3% ◇ Resolution: 0.1% Light Intensity ◇ Measurement Range: 0–200 klux ◇ Accuracy: ±5% ◇ Resolution: 0.1 klux Pressure ◇ Measurement Range: 300–1100 mbar (i.e., 30–110 kPa) ◇ Accuracy: 15-bit ◇ Resolution: 100 mbar Particulate Matter ◇ Basic Principle: Light scattering principle ◇ Measurement Range: 0.001–10.00 mg/m3 (K-value = 1, calibrated against standard particles) (0.0001–1) or 1–500 μg/m3 (K-value = 1, calibrated against standard particles) (0.0001–1) ◇ Accuracy: ±10% relative to standard particles ◆ Power Supply: DC 12V ◆ Static Power Consumption: 30 mA ◆ Operating Power Consumption: 70 mA ◆ Operating Temperature: -20°C to 70°C ◆ Signal Output: 485 Type: (9600, N, 8, 1) Modbus-RTU GPRS Type: UDP, public network, dedicated network IP, provides server reception software, automatic reception, data stored in SQL shared tables. ⊙ Modbus Protocol (Customizable) Modbus protocol commands include: Reading wind speed and direction values (factory default station number 2) Example command format for reading wind speed and direction: 02 03 00 00 00 02 CRC (CRC double-byte check) Note: The first byte 02 is the station number. If the station number has been modified, replace the subsequent 02 with the set station number. Then, recalculate the last two bytes as the 16-bit CRC check and write it. Example response format for wind speed and direction: 02 03 04 01 90 00 C5 CRC16 (CRC double-byte check) Note: Bytes 4 and 5 (0190) represent the wind speed value, and bytes 6 and 7 (00C5) represent the wind direction value. The customer should calculate whether the CRC16 check is correct. (Hex) 0x0190 = (Dec) 400 = 400/100 = 4.00 m/s (Hex) 0x00C5 = (Dec) 197 = 197° Modifying the Station Number Method 1: Knowing the current station number, send the following command: 02 10 10 00 00 01 02 00 03 CRC (double-byte) This changes the station number from 2 to 3. Note: Replace the italicized large numbers with the original station number and the regular large numbers with the desired target station number. The customer must calculate the CRC value before sending. Method 2: If the original station number is forgotten, connect the product alone to a computer (ensure no other 485 products are on the bus) and operate it using station number 0 with the following command: 00 10 10 00 00 01 02 00 03 CRC (double-byte) Ultrasonic Wind Speed and Direction Sensor CG-09 Multi-Element IoT Weather Station Online Investment Invitation