NDIR CO2 Sensors

Non-dispersive infrared (NDIR) CO₂ sensors

• Infrared absorption of CO2 molecules at a specific wavelength of 4.26 μm
• Sensor consists of IR source, light path, active detector and reference detector
• Concentration of CO₂ determines intensity of light striking active detector
• Reference detector provides a real-time signal to compensate the variation of light intensity due to ambient or sensor itself/

Carbon dioxide

• Associated with:
  • Confined space entry (produced by microbial decomposition)
  • Wineries / breweries (byproduct of fermentation)
  • Oil industry (injected into ground to decrease viscosity and aid extraction in old fields)
  • Vessel inertion (used in form of dry ice as well as compressed gas)
  • Greenhouses
  • Mushroom farms