Products IN-STOCK ready to Ship Next Day for orders placed by 2pm EST. Use Code SENSE for 10% OFF.

CO-A1 Alphasense 5,000ppm Carbon Monoxide 20mm Smart EC Sensor

CO-A1 Alphasense 5,000ppm Carbon Monoxide 20mm Smart EC Sensor
Precio habitual $161.00

POs or wholesale quantity discounts click here

The CO-A1 AlphaSense 5,000ppm Carbon Monoxide sensor is designed to detect highly dangerous toxic gas that poses a significant threat to those working in its presence. The circuit board's microprocessor provides zero and span calibration as well as barometric pressure, temperature and % relative humidity sensors. Features on-board memory to log data when used in a remote device.

This sensor can also integrate within various applications such as fixed systems to monitor indoor air environments and industrial safety applications.


  • Electrochemical Sensor Measures up to 5,000ppm Carbon Monoxide
  • Smart EC Board includes Barometric Pressure, Temperature and % Relative Humidity Sensors
  • Smart EC Board adds Serial UART output
  • Smart EC Board adds RS485 output with optional RS485 cable
  • Easy Integration; Compact & Low Power


    CO-A1 Alphasense 5,000ppm CO Sensor Only  for integration into high-volume OEM products, 20mm diameter, the industry standard size for portable gas detectors.

    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. Includes on-board memory for data logging.

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


    • Range: 0-5,000ppm carbon monoxide
    • Sensitivity: 55 to 90 nA/ppm in 400ppm CO
    • Response Time: < 25 sec. t90 (s) from zero to 400ppm
    • 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 0-1,000ppm
    • Zero drift: < 0.2ppm change per year
    • Sensitivity drift: < 8% change / year
    • Operating life: > 24 months until 80% original signal
    • Digital Output: Serial UART
    • Analog Output: Available

    Smart EC Board Adds

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

    Development Kit Adds

    • Smart EC Board
    • Serial USB Cable
    • Free GasLab Windows software for real-time measurements, data logging, graphing, sensor configuration.
    • RS485 output with optional RS485 cable


    • Dimensions (sensor): 16.5mm x 20.2mm
    • 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 CO2Meter Terms and Conditions

    Free Easy-to-use GasLab® Software

    The Smart EC Board 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. Tube cap adapters are not pre-installed. For accurate results you must mount the tube cap permanently.

    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.

    Probe Enclosure for Development Kits gives a strong and secure container to mount the sensor. Hydrophobic filters available for enclosure for outdoor use.



    • Data Sheets

    • Manuals

    • Technical Documents

    • Videos

    • Additional Resources

    • Case Studies

    Customer Reviews

    Be the first to write a review

    "Easy to install, easy to set up, and easy calibration - just what I was looking for."

    - Phillip Farrar
    Water Plant Superintendent

    Read More Reviews...