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

33 units will be available shortly.

Express post shipping available (product is on backorder)

This full-scale oxygen sensor employs the original AO2 CiTiceL® oxygen sensor probe and features a measurement range of 0-100%Vol and I2C digital output, which can be adapted to application scenarios including oxygen generators, automobile exhaust, and air-fuel ratio detection.

The DFRobot oxygen sensor has a built-in calibration algorithm on the signal board that can quickly perform single-point or double-point calibration so as to accurately measure the oxygen concentration in the environment. Based on the principle of electrochemistry, the sensor probe comes with strong anti-interference ability, high stability and sensitivity, and up to two years of service life. It is compatible with mainstream controllers such as Arduino, ESP32, Raspberry Pi, etc. Besides, the sensor is designed with an easy-to-use Gravity interface, and with our sample codes, you can quickly build an oxygen detector.

Caution: Exposure to high concentrations of solvent vapors is avoided, both during storage, fitting into instruments, and operation.

I2C Oxygen Sensor Selection Guide

Product Gravity:Electrochemical Oxygen Sensor (0-25%Vol) - I2C

Gravity:Electrochemical O2 Sensor (Calibrated) - I2C & UART

Gravity: Electrochemical Oxygen Sensor  (0-100%Vol) - I2C
SKU SEN0322 SEN0465 SEN0496



0~25%Vol 0~25%Vol 0~100%Vol



Manual calibration Factory calibration Manual calibration
Output Signal I2C I2C,UART,Analog I2C



Electrochemical Electrochemical Electrochemical
Stability <2%/Month <2%/Month <10%/Year
Response Time ≤15S ≤15S  0.1%~20.9%<40S  20.9%~100%<5S


Pressure Range

101kPa±10% 101kPa±10% 0.5 - 2.0 Bar



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  • Strong anti-interference ability
  • High stability and sensitivity

  • Applications
  • Oxygen generators
  • Automobile exhaust
  • Air-fuel ratio detection

  • Specification
  • Physical Quantity Detected: Oxygen concentration
  • Measuring Range: 0~100%
  • Working Voltage: 3.3~5.5V DC
  • Output Signal: I2C
  • Working Pressure Range: 0.5~2.0Bar
  • Operating Temperature Range: -20°C ~ +50°C
  • Operating Humidity Range: 0-99% RH (non-condensing)
  • Response Time: <5S
  • Lifespan: >2 years (in air)
  • Size: 32mm*27mm/1.26*1.06 inch
  • Mounting Hole Size: inner diameter 3.1mm(0.12 inch)/outer diameter 6mm(0.24 inch)
  • Compatible with Arduino, ESP32, Raspberry Pi

  • Documents
  • Product wiki
  • AO2 Datasheet
  • Schematics
  • Dimension & Component Layout

  • Shipping List
  • Gravity: AO2 Oxygen Sensor Signal Adapter Board x1
  • AO2 Oxygen Sensor Probe x1
  • Gravity-4Pin Cable x1
  • Molex 2510 - PH2.0 cable (20CM)  x1
  • The Gravity: Electrochemical Oxygen Sensor (0-100%Vol) - I2C appears in the following collections:

    SKU DF-SEN0496