AlphaSense CO-AF Carbon Monoxide Sensor

AlphaSense CO-AF Carbon Monoxide Sensor
Regular price $109.00 USD

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The AlphaSense CO-AF Carbon Monoxide Sensor provides an accurate and reliable way to measure up to 5,000 ppm CO 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 micro-controller to produce an accurate gas concentration measured in ppm (parts per million).

This can be read as serial UART output or can be logged in internal memory for later retrieval. In addition the board makes it easy to apply zero or span calibration.


  • Excellent response time to changes in CO levels
  • Low sensitivity to temperature changes
  • Easy integration; compact & low power


    CO-AF: Sensor Onlyfor integration into high-volume OEM products.

    CM-31911 Development KitEasy to use, simply plug the EC Board into your PC via the included Serial UART to USB cable. Use our free GasLab® software to measure and graph carbon dioxide, barometric pressure, temperature, and % relative humidity. 

    CM-31910 Smart EC BoardSame functionality as the development kit without USB cable or software.

    Sensor Specifications

    • Range: 0-5,000ppm carbon monoxide
    • Sensitivity: 55 to 90 nA/ppm in 400ppm CO
    • Response Time: < 25 sec. t90 (s) from zero to 400 ppm
    • Zero current: -5 to +4ppm equivalent in zero air
    • Resolution: < 0.5 RMS noise (ppm equivalent)
    • Linearity: +15 to +25ppm error rate at full scale from 0-1,000 ppm
    • Zero drift: < 0.2ppm change per year
    • Sensitivity drift: < 8% change / year
    • Operating life: > 24 months until 80% original signal
    • Digital Output: UART 

    Smart EC Board Functionality

    • Temperature, %RH  sensor on board
    • Barometric pressure sensor
    • 64K memory for time-stamped data logging of all measurements
    • RS485 output with optional RS485 cable

    Development Kits Adds

    • Serial UART to USB cable
    • Free Windows software for real-time measurements, graphing


    • Dimensions (sensor): 16.5mm x 20.2mm
    • Dimensions (sensor + Board): 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.

    Cross Reference Chart for Replacement Sensors

    Model Part Number
    Sensor Type 4R CO 
    Semeatech 4CO-500 051-0000-000
    RAE 4RCO-500 032-0100-000
    Solidsense 4C0-500 CLE-0052-400
    City 4CM CiTiceL 2112B2005
    Sensoric CO 3E 500S 025-134-30049
    Alphasense (0-1000) CO-AF
    Membrapor n/a CO/MF-500
    DDS (0-500) GS+4CO

    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 Latest Software Here

    System Requirements

    • Windows XP SP2 or newer
    • Microsoft .Net 3.5 Runtime Libraries
    Tube cap adapters easily convert 20mm standard gas sensors from diffusion to sampling sensors. Molded polymer grips sensor for easy fit and removal while maintaining a good seal.

    RS485 Cable. Custom USB cable enables RS485 communication to GasLab Software for EC Sensor Board and Development Kit.

    Micro-Pump Kit includes all the tools you need to utilize the tube-cap adapters as part of a sampling sensor system.

    Nafion tubing is a highly selective, semi-permeable membrane to water vapor. If gases inside Nafion tubing are wetter than gases surrounding the tubing, drying will occur. If the surrounding gases are wetter, humidification will occur.

    Micro gas sampling pumps provide a constant flow of air across the sensor with a tube cap - perfect for bench-top testing of sensors for closed-loop sampling applications.

    Sensor Pin Sockets - Manufacturers do not recommend soldering to the pins. Pin sockets can be purchased from Andon distributors. Click here to search for your sensor's socket. Select the brand PDF, find your sensor, then search for the Andon part number for your sensor's socket.

    Customer Reviews

    Based on 1 review
    Eric Stivender

    Works fine, need time to see how long they will last

    "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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