CM1106HA-NS ASHRAE62.1-2022 Addendum ab Compliant Single-Channel NDIR CO2 Sensor

The CM1106H-NS is a high accuracy CO2 sensor designed to support:

  • ASHRAE 62.1-2022 Addendum ab
  • WELL
  • ASHRAE 62.1-2019 Addendum aa
  • California Title 24 Applications applications.

The sensor is ideal for indoor ventilation control and CO2 monitoring in commercial and residential HVAC applications.


  • High Accuracy Supports WELL, RESET, ASHRAE 62.1-2019 Addendum aa & California Title 24 Applications
  • Long Lifespan 15+ years
  • Maintenance Free - Automatic Baseline Calibration (ABC)
  • Temperature and Humidity Compensation Throughout The Entire Measurement Range



Accuracy +/-30ppm + 3% of reading

+/-75ppm at concentrations of 600, 1000, and 2500ppm when measured at sea level at 75 degrees Fahrenheit (25 degrees Celsius)

ASHRAE 62.1-2022 Addendum ab Compliant

Measurement Range 0 to 2,000ppm (PWM)

0 to 10,000ppm (UART / I2C)

Temperature Range 14˚F to 155˚F (-10˚C to 50˚C)
Humidity Range 0-95% RH
Supply Voltage 4.3-5.5 VDC
Supply Current <50mA
Communication Interfaces PWM, UART & I2C
Dimensions 33.5 x 19.7 x 8.9mm
Weight 5g
Life Expectancy >15 years

Operating Principle

Single Channel Non-Dispersive Infrared (NDIR) Sensors

NDIR sensors leverage Lambert-Beer’s law that states certain gasses exhibit absorption characteristics at a specific infrared wavelength.

Single Channel NDIR sensors use an single infrared light source and a single IR detector “tuned” to the specific wavelength for the target gas. The IR light is passed through an optical bench that “folds” the light within the optical bench to create a long optical path length – providing high accuracy and resolution when measuring the target gas.

As the target gas concentration increases, the amount of received IR light at the IR detector decreases, this relationship is converted to a PPM measurement within the sensor.


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