Sensor CO2 1W-UNI

Sensor CO2 1W-UNI is a combined Temperature (-0 to +50 °C), Relative Humidity (RH 0-95%) and CO2  (300 - 40000 ppm) sensor in one box for the indoor environment.  Can be connected via RJ11 interface (1-Wire UNI bus) with all HW group monitoring devices.

Housed in a small elegant plastic box, this sensor can be mounted on a wall or a ceiling or placed on a desk. It is small and lightweight so it can be secured in place with a piece of double-sided adhesive tape. A detachable cable with RJ11 jacks is used for the connection. Connection cable 3m included in the package.





  • Communication interface: 1-Wire UNI (RJ11)
  • Maximum lenght from the active 1-Wire port: 30 m
  • Temperature measurement: In the range -0 to +50 °C, accuracy: 0.8 °C
  • Humidity measurement: In the range – 0-95 %RH (Relative Humidity)
  • Measurement CO2: In the range 300 to 40000 ppm
  • 5V power from the 1-Wire port
Applications and usage: 

Thanks to its ability to monitor CO2, Temperature, and RH (Relative Humidity), this sensor can be used in many areas. In addition to monitoring air quality in households, commercial buildings and school buildings, it will also help you in various measurement and regulation projects.

Installation and use

  1. Connect the sensor to any HW group monitoring device (RJ11 cable included).
  2. Switch on the device power & search for the sensors.
  3. Temperature and humidity values are available immediately.
  4. Internal CO2 sensor needs to be first calibrated in the environment. The calibration takes 7 days; during this time, it is necessary to air the premises regularly and thoroughly, at least 3 times a day.


Air quality levels

Less than 500 ppm Excellent
500-800  ppm Very good
800-1200  ppm Good
1200-1500  ppm Bad
More than 1500  ppm Unhealthy


Horizontal menu

The information about time related sensors precision and the need for calibration can be found in this application note.

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