What is the NDIR principle and why do we use it in our sensors?

How does this principle work?

NDIR sensors are based on the principle of absorption of infrared radiation at a specific wavelength by CO₂ molecules in accordance with the Beer-Lambert law*. In the measuring chamber, there is a source of infrared radiation and a detector. The more CO₂ molecules present in the air in the measuring chamber, the less infrared radiation reaches the detector from the source. The signal from the infrared detector is then amplified and converted to CO₂ concentration in ppm, see the image on the right.

With Protronix CO₂ sensors, you have no worries

What benefits do our carbon dioxide concentration sensors offer?

• reliable advanced NDIR principle
• long-term stability
• requires no maintenance
• automatic calibration
• sensors are compatible with most ventilation units on the market
• wide power supply range 12-24 V / 230 V
• new NL-ECO-CO2 series
  • automatic LED turn-off at night
  • smart features such as – BOOST button, optional measurement range, alarm
• sensors for overlay with a custom cover or a sensor designed specifically for classrooms