Posted in | Oxygen Sensors

Accurate Oxygen Sensors with Pressure and Temperature Independence

The AlphaSense O2-A2 oxygen sensor is a reliable and precise means to quantify up to 21% oxygen levels by volume.

The sensor’s analog output current is converted by the smart board and development kit to a voltage that is quantified by a high-resolution analog to digital converter. A microcontroller corrects and compensates the digital voltage for pressure and temperature, thereby generating an accurate gas concentration measured in parts per million (ppm).

This can be read as RS485 serial output or can be recorded in internal memory for later recovery. Furthermore, the board enables zero or span calibration to be easily applied.


  • Electrochemical (EC) sensor is developed to keep working for up to two years
  • Compact, small, and requires no maintenance
  • Excellent temperature and pressure independence


AP-0001 O2-A2 Sensor — It is a plug-in replacement sensor for several oxygen safety monitors or for incorporation into OEM oxygen safety products.

CM-32911 O2-A2 Sensor Development Kit — It is user-friendly. The board can be simply plugged into the PC through USB. The free GasLab® software can be used to measure and graph barometric pressure, oxygen levels, % relative humidity, and temperature. On-board memory has been incorporated for data logging.

CM-32910 O2-A2 Sensor MX Board — It has the same functionality as the development kit but does not have any USB cable or software.


  • Output: 80–120 µA at 20.9% oxygen
  • Measurement range: 0%–20.9% oxygen
  • Linearity: 0.6% O2 deviation at 10%
  • Response time: Less than 15 seconds t90 (s) from 20.9% to 0%
  • Operating life: More than two years until 85% original output of 20.9%
  • Output drift: Less than 1% change at three months
  • Analog output: Available
  • Digital output: RS485

Smart MX Board Functionality

  • Temperature sensor
  • Carbon monoxide sensor
  • Barometric pressure sensor
  • % Relative humidity sensor
  • RS485 communication
  • 64K memory for time-stamped data logging of all measurements

Development Kits Adds

  • Free Windows software for real-time measurements and graphing


  • Dimensions (sensor + PCB): 40 mm x 25 mm x 29 mm (length x width x height)
  • Dimensions (sensor): 17.4 mm x 20.3 mm
  • Current consumption: 10 ma peak, less than 3 mW average
  • Power input: 3.3–5.5 VDC


  • 90 days

Accurate Oxygen Sensors with Pressure and Temperature Independence

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