Sensirion — CO2 and RH/T Sensor Module for HVAC and Indoor Air Quality Applications

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CMOSens® Technology for IR detection enables highly accurate carbon dioxide measurement at a competitive price.

Along with the NDIR measurement technology for CO2 detection, a best in class Sensirion humidity and temperature sensor is also integrated on the same sensor module. Ambient humidity and temperature can be outputted by Sensirion’s algorithm expertise through modeling and compensating of external heat sources without the requirement for any additional components. Thanks to the dual-channel principle for the measurement of carbon dioxide concentration, the sensor compensates for long-term drifts automatically by design. The very small module height allows easy integration into different applications.

Carbon dioxide is a key indicator of indoor air quality. Thanks to new energy standards and better insulation, houses have become increasingly energy efficient, but the air quality can deteriorate rapidly. Active ventilation is needed to maintain a comfortable and healthy indoor environment, and to improve the well-being and productivity of the inhabitants. Sensirion’s SCD30 offers accurate and stable CO2, temperature and humidity monitoring. This enables customers to develop new solutions that increase energy efficiency and simultaneously support well-being.


  • Demand-controlled ventilation
  • HVAC equipment
  • Air conditioners
  • Air purifiers
  • Smart home
  • IoT devices

  • Outstanding stability due to compensation of long-term drifts by dual channel principle
  • Three sensor signals based on Sensirion’s CMOSens Technology
    - Absolute carbon dioxide concentration
    - Relative humidity and temperature
  • Small form factor and thinnest package


  • NDIR measurement principle
  • Built-in reference channel
  • Temperature compensation of CO2 sensor signal
  • Inhouse detector based on Sensirion’s CMOSens Technology
  • On-board temperature and humidity sensor
  • Fully calibrated and linearized. UART and I2C interface

  • Accurate and reliable CO2 measurement
  • Superior long-term stability
  • Best temperature stability
  • Best performance-to-price ratio
  • Saves effort regarding system design and qualification
  • Easy interfacing and read-out


Evaluation Kit SEK – Environmental Sensing
Test Sensirion’s environmental sensors with Sensirion’s evaluation kit SEK-Environmental Sensing. The kit is designed for a quick, easy and cost efficient evaluation of Sensirion’s environmental sensors. This facilitates to evaluate sensors and develop innovative sensor applications. It combines plug-and-play hardware with an easy-to-use viewer software for in-depth evaluation. Each evaluation kit includes a Sensirion SensorBridge, all required connector cables, as well as various sensor samples. The SensorBridge features two independent I2C channels that allow simultaneous evaluation of two environmental sensor samples. The ControlCenter viewer software makes it possible to display and log the sensor signals for multiple sensors connected to several SensorBridges on the same PC.