Industrial Duct Air Velocity & Wind Speed Sensor with LCD Display & RS485 Output

Specifications

• Operating Voltage: 12V - 24V DC 
• Measurement Range: 0 - 30 m/s
• Output Signals: RS485 
• Display: Built-in LCD screen for real-time velocity monitoring
• Probe Length: 200mm 
• Accuracy: ±3% full scale
• Response Time: < 1 second 
• Housing Material: Industrial Aluminum / Polycarbonate 
• Operating Temperature: -20°C to +60°C  

Minimum hardware to get started:

• 12V–24V DC Power Supply : the sensor's robust industrial circuitry requires a higher voltage source and will not power on from standard 3.3V or 5V microcontroller pins.
• RS485 to TTL / USB Converter Module : required if you are using an Arduino, ESP32, or a PC, to translate the sensor's industrial differential signal into standard serial data.
• Shielded Twisted Pair (STP) Cable : to prevent electromagnetic interference (EMI) from corrupting the sensor's data lines, especially important in noisy industrial or factory environments.

Safety Warnings:

• Voltage Isolation: This sensor operates on 12V–24V DC. Never connect the sensor's main power lines directly to the GPIO pins of an Arduino, ESP32, or Raspberry Pi, or you will instantly destroy the microcontroller.
• Analog Scaling: If using the 0-10V analog output, ensure your ADC (Analog-to-Digital Converter) or PLC is rated to accept 10V. Standard ESP32/Arduino ADCs max out at 3.3V or 5V and will require a voltage divider.

Accessories
Included in the Box:

• 1× Pipe Air Velocity / Speed Sensor with LCD Screen
• 1× Mounting Flange / Hardware

Frequently Asked Questions

• Is this pipe speed sensor compatible with standard Arduino or ESP32 boards? Yes, but it requires external hardware like an RS485-to-TTL converter (MAX485) and a separate 12V-24V power supply, as the sensor cannot be powered directly by the microcontroller.
• Can this sensor measure liquid flow inside a pipe?
  No, this is an anemometer-style velocity sensor designed exclusively for air and non-corrosive gas flow measurement inside ducts and pipes.
• Does the built-in screen work independently of the output signals?
  Yes, the LCD screen will display real-time air velocity readings as long as the sensor is supplied with 24V DC power, even if no data lines are connected.
• Can I connect this directly to an industrial PLC?
  Yes, the sensor is fully compatible with standard industrial PLCs using either the RS485 Modbus RTU interface.
• What is the required operating voltage for this sensor?
  This industrial sensor requires a standard 12V to 24V DC power supply to operate reliably and power the internal LCD screen.
• Can I power this sensor from a 5V USB power bank?
  No, a 5V supply is insufficient to power the sensor's logic circuitry or the 4-20mA current loop; it will not turn on.
• How much current does the sensor draw during operation?
  While exact current draw depends on the output mode used, a standard 24V 1A or 2A industrial power supply is more than sufficient for stable operation.
• Can I use both the RS485 and the 4-20mA analog outputs at the same time? Typically, only one output mode should be wired to your controller at a time to prevent signal interference or ground loop issues.
• How far can I run the cables from the sensor to my control panel?
  Using the RS485 Modbus output with shielded twisted pair (STP) cable, you can reliably transmit data up to 1000 meters in a typical industrial environment.
• Do I need a common ground if I am using an isolated RS485 module?
  Yes, you should always ensure a common ground reference between the sensor's power supply and your receiving module to prevent floating signals and communication errors.
• Which Arduino library should I use to read the RS485 data?
  The standard ModbusMaster library (available in the Arduino Library Manager) is highly recommended for reading Modbus RTU holding registers from this sensor.
• Where can I find the Modbus register map for this sensor?
  The holding register addresses for velocity data, baud rate settings, and unit ID are typically provided in the standard manufacturer datasheet shipped with the unit.
• How do I convert the 4-20mA signal into a velocity reading in my code?
  You will map the analog input value corresponding to 4mA as 0 m/s, and the value corresponding to 20mA as the sensor's maximum rated velocity (e.g., 30 m/s).