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AlphaSense O2-A2 Oxygen Sensor

AlphaSense O2-A2 Oxygen Sensor
Regular price $49.00 USD

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The AlphaSense O2-A2 oxygen sensor is an accurate and reliable way to measure up to 21% oxygen levels by volume.

The smart board and development kit converts the sensor’s analog output current to a voltage that is measured by a high-resolution analog to digital converter. The digital voltage is corrected and compensated for temperature and pressure by a microcontroller to produce an accurate gas concentration measured in ppm (parts per million). This can be read as RS485 serial output or can be logged in internal memory for later retrieval. In addition the board makes it easy to apply zero or span calibration.


  • Electrochemical (EC) sensor designed to last for up to 2 years
  • Good pressure and temperature independence
  • Small, compact & maintenance free


AP-0001 O2-A2 Sensor – Plug-in replacement sensor for many oxygen safety monitors or for integration into OEM oxygen safety products.

CM-32911 O2-A2 Sensor Development KitEasy to use, simply plug the board into your PC via USB. Use our free GasLab® software to measure and graph oxygen levels, barometric pressure, temperature, and % relative humidity. Includes on-board memory for data logging.

CM-32910 O2-A2 Sensor MX Board – Same functionality as the development kit without USB cable or software.


  • Measurement Range: 0-20.9% Oxygen
  • Output: 80-120 uA @ 20.9% Oxygen
  • Response Time: < 15 sec. t90 (s) from 20.9% to 0%
  • Linearity: 0.6% O2 deviation @ 10%
  • Output drift: < 1% change @ 3 months
  • Operating life: > 24 months unti 85% original Output of 20.9%
  • Digital Output: RS485
  • Analog Output: Available

Smart MX Board Functionality

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

Development Kits Adds

  • Free Windows software for real-time measurements, graphing


  • Dimensions (sensor): 17.4mm x 20.3mm
  • Dimensions (sensor + PCB): 40mm X 25mm x 29mm (LxWxH)
  • Power Input: 3.3-5.5 VDC
  • Current Consumption: 10ma peak, < 3mW average


  • 90 days. See terms and conditions.

Free Easy-to-use GasLab® Software

This device uses GasLab® software for setup, calibration, data logging, and real-time data analysis. GasLab® makes it easy to export data into a .CSV file that can be imported into any industry-standard software or spreadsheet. GasLab® runs on Windows XP or higher, and free to use with our products.

Download Software

System Requirements

  • Windows XP SP2 or newer
  • Microsoft .Net 3.5 Runtime Libraries

Customer Reviews

Based on 1 review
Quick and easy and got my part right away!

Easy ordering process, efficient and received the part quickly!

"Swift response and shipment. The product is easy to setup and use. It is just what I was looking for."

- Shima Tomohiro

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