CO2 concentration detector in NDIR technology

You’re probably wondering what an NDIR sensor is. In Wikipedia we read that it is nondispersive infrared sensor. Nondispersive - without element that splits light into components. There is no prism or diffraction grating. The NDIR sensor is a spectroscopic sensor that uses a light source and usually an additional optical filter. The point is to choose a very narrow spectral range that most closely matches the absorption area of the gas. Any gas absorbs light at different wavelengths in a different way. Based on this, we can identify the gas and estimate its concentration.

Specification:

• Manufacturer: Winsen
• Model: MH-Z14A
• Output:
  • Serial UART (TTL)
  • PWM
  • Analog (0.4 - 2V)
• Range (%): 0 - 5%
• Range (ppm): 0 - 5000 ppm
• Accuracy: ±(50ppm +3% reading value)
• Supply voltage: 4.5 V - 5.5V DC
• Current consumption (average): <60mA (@5V)
• Current consumption (peak): 150mA (25V)
• Logic: 3.3V (5V compatible)
• Work temperature: 0 - 50C
• Weight: 15g
• Lifespan: >5 lat

Links:

• Manufacturers Product Page