A factory-calibrated electrochemical sulfur dioxide (SO2) sensor with I2C, UART, and analogue output modes. Part of the DFRobot Gravity gas sensor series, this module quickly and accurately measures SO2 concentration for industrial monitoring and environmental protection applications.

The electrochemical probe offers strong interference resistance, high stability, and high sensitivity with a lifespan of over two years. The signal conversion board features 32 configurable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function. Compatible with Arduino, ESP32, and Raspberry Pi via the Gravity 4-pin connector.

Key Features

• Factory Calibrated – Ready for accurate measurement out of the box
• Triple Output – I2C, UART (0–3V), and analogue voltage
• Electrochemical Sensing – High sensitivity with strong anti-interference capability
• 32 I2C Addresses – Configurable for multi-sensor setups on a single bus
• Temperature Compensation – Integrated algorithm for consistent readings
• Threshold Alarm – Built-in alert function for concentration limits
• 2+ Year Lifespan – Long-lasting probe in normal air conditions
• Gravity Interface – Plug-and-play 4-pin connector

Ideal For

• Industrial SO2 emissions monitoring
• Environmental air quality systems
• Safety and compliance detection equipment
• Multi-gas monitoring stations (compatible with 12 sensors in the DFRobot series)

Specifications

• Detection Gas – Sulfur Dioxide (SO2)
• Detection Range – 0–20 ppm
• Working Voltage – 3.3–5.5V DC
• Working Current – <5mA
• Output Signal – I2C, UART (0–3V), analogue voltage
• Working Temperature – –20°C to +50°C
• Working Humidity – 15–90% RH (non-condensing)
• Storage Temperature – –20°C to +50°C
• Lifespan – >2 years (in air)
• Board Size – 37 × 32mm
• Compatibility – Arduino, ESP32, Raspberry Pi

Package Contents

• 1× Gravity SO2 Signal Conversion Board
• 1× SO2 Sensor Probe
• 1× Gravity 4-Pin Cable

Resources

• Product Wiki