WS302 Sound Level Sensor

Milesight WS302 LoRaWAN® Sound Level Sensor

The WS302 is a compact and powerful LoRaWAN® sensor designed to measure environmental sound levels with precision. It offers selectable frequency and time weighting modes, ideal for noise monitoring in smart cities, offices, and factories.

• 30 to 120 dBA Measurement Range
• ±3 dB Accuracy and 0.1 dB Resolution
• A-Weighting and C-Weighting Modes
• Fast-Time Weighting Option (125 ms)
• Measures SPL Actual, Leq, and Lmax
• Up to 4 Years Battery Life
• Visual LED Alarm Indicator
• Easy NFC Configuration

A & C Weighting

Switch between A-weighting for quieter environments and C-weighting for louder areas, enabling accurate monitoring based on the noise conditions.

Fast-Time Weighting

Fast-time weighting applies a 125 ms time constant, perfect for measuring fluctuating or unstable noise.

Note: Fast weighting is disabled by default. Enabling it reduces battery life.

Multiple Sound Metrics

The WS302 supports measurement and reporting of:

• Sound Pressure Level (SPL)
• Maximum Sound Level (Lmax)
• Equivalent Continuous Sound Level (Leq)

Technical Specifications

• Technology: LoRaWAN®
• Frequency Bands: CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1/2/3/4
• Tx Power: 16 dBm (868 MHz) / 22 dBm (915 MHz) / 19 dBm (470 MHz)
• Sensitivity: -137 dBm @ 300 bps
• Mode: OTAA/ABP Class A
• Measurement Range: 30 dBA to 120 dBA; 35 dBC to 120 dBC
• Accuracy: ±3 dB (0°C to +45°C)
• Resolution: 0.1 dB
• Frequency Range: 30 Hz to 8 kHz
• Weighting: A and C (software switchable)
• Time Weighting: Fast
• Measurement Units: SPL Actual, Leq, Lmax
• Configuration: NFC
• Button: 1 × Power/Reset
• LED: 1 × Status/Alarm Indicator
• Power Supply: 2 × 2700 mAh ER14505 Li-SOCl? (replaceable)
• Battery Life: 1.5 to 4 years (depending on usage)
• Operating Temperature: -20°C to +60°C
• Relative Humidity: ?95% (non-condensing)
• Ingress Protection: IP30
• Dimensions: 68 × 65 × 20.5 mm (2.68 × 2.56 × 0.81 in)
• Material & Color: PC+ABS, White
• Installation: Screws or 3M tape on flat surfaces

Documentation:

WS302 Datasheet

WS302 User Guide