Noise Sensor with RS485/Analog Output

• Parameter Measured: Sound pressure level (SPL)

• Measuring Range: 30 dB(A) to 130 dB(A)

• Frequency Range: 20 Hz to 12.5 kHz (A-weighted)

• Accuracy: ±1.5 dB

• Resolution: 0.1 dB

• Time Weighting: Fast/Slow (selectable) per IEC 61672 standard

• Dynamic Range: ≥ 100 dB

Output Interfaces

• Analog Output:

  • 4–20 mA or 0–10 V (user selectable)

  • Output proportional to 30–130 dB(A)

  • Accuracy: ±0.5% full scale

• Digital Output (RS485):

  • Protocol: Modbus RTU

  • Baud Rate: 9600 / 19200 / 38400 bps (configurable)

  • Device Address: 1–255

  • Data Format: 16-bit signed integer / floating-point

Electrical Characteristics

• Power Supply: 12–24 V DC (typical 24 V DC)

• Power Consumption: <2 W

• Electrical Protection: Reverse polarity and surge protection

• Isolation: 1500 V isolation between RS485 and power

Mechanical and Environmental

• Enclosure Material: Aluminum alloy with corrosion-resistant coating

• Protection Grade: IP65 (outdoor version with windscreen), IP40 (indoor version)

• Working Temperature: -20 °C to +70 °C

• Humidity: 0–95% RH (non-condensing)

• Mounting: Wall mount or pole mount bracket

Functional Features