3-Cup Anemometer, 0~30 m/s Wind Speed, RS 485 Output

The three-cup anemometer is specifically designed to accurately and reliably measure wind velocity under the adverse environmental conditions. Output signals include pulse, current 4-20mA, RS-485, voltage 0-2V/5V/10V. The wind speed sensor has built-in digital circuit, with strong anti-RFI and EMI ability and automatic temperature compensation function. Measurement value and horizontal wind speed are linear relation.

Specification

Features

• Shell of the 3-cup anemometer is made of high-strength aluminum alloy, wind cups are made of 304 stainless steel, and the PCB board is coated with anti-corrosion coating. Waterproof and corrosion resistant.
• The wind speed sensor has a sealing ring inside and at the rotating position, which has good sealing performance and prevents water, salt spray and dust from entering.
• The three-cup air velocity meter has low starting threshold, strong corrosion resistant ability, massive all-metal construction, easy Installation.

3-Cup Anemometer Output Characteristics

• Pulses Output

Characteristic transfer function:

V = 0.667*F

(where V = wind speed (m/s), F = output frequency (Hz) )

• Current Output

• Voltage Output

Characteristic transfer function:

V = U/ (full scale voltage - zero point voltage) * 30

(where V = wind speed (m/s), U = output voltage (V) )

• RS-485 Output

lf the transmission distance is over 100m, please add a 120Q terminal matching resistances on the front endand back end of bus interface respectively. See the modbus communication protocol specification.

3-Cup Anemometer Dimension Diagram (Unit: mm)

Tips: 4-20mA output signal conversion calculation for 3-cup anemometer.

When the 3-cup anemometer range is 0~30 m/s and the output is 4~20mA, if the output signal is 12mA, how to calculate the current wind speed value?

The span of this wind speed range is 30m/s, expressed by 16mA current signal,
30 m/s ÷ 16mA = 1.875/mA, that is, a current of 1mA represents a wind speed change of 1.875m/s.

The measured value is 12mA － 4mA = 8mA. 8mA*1.875m/s /mA = 15m/s. The current wind speed is 15m/s. The calculation formula is:

Wind speed = 1.875*current － 7.5, current value unit is mA.