DFRobot - Gravity: Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C)

This Gravity electrochemical oxygen sensor adds ambient O2 concentration measurement to air-monitoring projects without requiring an external analog signal converter. The 0~25%Vol measurement range and 0.15%Vol resolution support oxygen concentration readings in portable instruments, environmental monitoring systems and warehouse observation projects. I2C output, a Gravity interface and practical sample code simplify integration with Arduino Uno, ESP32 and Raspberry Pi. A 3.3 to 5.5V DC supply range accommodates common controller platforms, while air calibration helps maintain measurement performance. This compact module measures oxygen in air, making the sensor suitable for gas-concentration projects.

Electrochemical Sensing for Ambient Oxygen Measurement

This O2 sensor uses electrochemical sensing to measure oxygen concentration in ambient air, with high sensitivity, stability and resistance to interference. The specified response time is ≤15 seconds, supporting projects that track changing oxygen levels. A 0.15%Vol resolution describes the measurement granularity, while the specified measurement range remains 0~25%Vol. These parameters help match the sensor to an air-monitoring project without confusing the separately listed maximum measurement limit with the normal operating measurement range.

Digital I2C Connection Across Common Controllers

This Gravity oxygen sensor provides concentration data through a standard I2C interface, keeping communication straightforward for compatible controllers. The 3.3 to 5.5V DC operating range supports both 3.3V and 5V microcontroller systems, and built-in polarity protection adds hardware protection during integration. The included Gravity-4pin I2C cable and sample code provide a practical starting point for connecting and reading the module. A 37 * 27 * 24.5 mm footprint supports installation in compact monitoring builds.

Air Calibration and a Specified Service Life Over Two Years

This electrochemical oxygen sensor supports calibration in air, providing a convenient reference for setting up ambient oxygen measurements. Periodic calibration is recommended according to the usage environment, rather than relying on a fixed universal interval. The specified service life is over two years in air under normal conditions. Combined with the Gravity interface and practical examples, these capabilities support repeat use in monitoring projects while keeping calibration and operating conditions part of the measurement workflow.

Selection Guide

Product Name

Gravity: Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C)

Gravity: Factory Calibrated Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C & UART)

Gravity: Electrochemical Oxygen / O2 Sensor (0-100%Vol, I2C)

Figure

SKU

SEN0322

SEN0465

SEN0496

Detection Range

0~25%Vol

0~25%Vol

0~100%Vol

Calibration Method

Manual calibration

Factory calibration

Manual calibration

Output Signal

I2C

I2C/UART/Analog

I2C

Working Principle

Electrochemical

Electrochemical

Electrochemical

Stability

Response Time

≤15S

≤15S

0.1%~20.9%

Operating Pressure Range

101kPa±10%

101kPa±10%

0.5 - 2.0 Bar

Temperature Compensation

×

√

×

Add to Cart

• Electrochemical measurement of ambient oxygen concentration over 0~25%Vol
• 0.15%Vol resolution and ≤15 seconds response time
• Standard I2C output with a Gravity interface
• Compatible with Arduino Uno, ESP32 and Raspberry Pi
• 3.3 to 5.5V DC operation for 3.3V and 5V controller systems
• Calibration in air with practical sample code
• Built-in polarity protection

• Portable air quality monitoring devices
• Environmental monitoring in industries and mines
• Ambient oxygen concentration monitoring in warehouses

• Detection of Gas: oxygen / O2
• Operating Voltage: 3.3 to 5.5V DC
• Output Signal: I2C output
• Measurement Range: 0~25%Vol
• Maximum Measurement limit: 30%Vol
• Resolution: 0.15%Vol
• Sensitivity: (0.10±0.05) mA (in the air)
• Stability:
• Repeatability:
• Response Time: ≤15 seconds
• Operating Temperature: -20～50℃
• Operating humidity: 0～99%RH (no condensation)
• Pressure Range: standard atmospheric pressure ±10%
• Lifetime: > 2 years (in the air)
• Dimension (L x W x H): 37 * 27 * 24.5 mm/1.46 * 1.06 * 0.97 inches
• Weight:0.037kg

• Gravity: Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C) x1
• Gravity-4pin I2C Cable x1
• M310 Nylon post x4
• M35 Screws x8