can be shipped within 14 days

Price without VAT or delivery
Delivery weight: 200 g

  • Indoor air quality
  • Dual Wavelength NDIR measurement methods
  • Range 0...2000 ppm CO2
  • Ad in 6 stages over LED green-yellow-red
  • Output 0/4...20 mA or 0...10 V
  • Wall enclosure for mounting on flush-mounted switch box
  • Power supply 24 Vac or 24 Vdc


Better air quality reduces fatigue and loss of concentration!

In many environments, the motivation decreases when the air quality deteriorates. The simplest solution is to open a window! However, this is not in any work environment possible. The CO2 monitor CM2 helps to keep the air quality at a constant level and to counteract fatigue. It measures the CO2 content in the air, displays it via a LED strip. In addition it initiated directly an automatic window opening or closing.

The measurement of CO2  content is based on the dual wavelength NDIR method. An infrared emitter emits light in a cuvette of two adjacent wavelengths on a receiver. CO2  is located in the beam path, is the characteristic wavelength of the CO2  weakened and provides a signal for the evaluation. The evaluation provides an output signal of 0/4...20 mA corresponding 0...2000 ppm CO2 . Furthermore, in the front cover of the unit, the CO2  content visually displayed on a 6-segment LED display in the colors green, yellow and red. The electronics is in a white plastic case mounted for wall mounting. The case can also be mounted on a flush-mounted box. The device is powered with 24 Vac or 24 Vdc.



Range: 0...2000 ppm CO2
Measuring methode: Dual Wavelength NDI
Response time (t63): < 30 s
Time interval measurements: 1,5 s
Optical display: 6 LED

  • < 400 ppm green 1
  • > 400 ppm green 2
  • > 600 ppm yello 1
  • > 1000 ppm yello 2
  • > 1500 ppm red 1
  • > 2000 ppm red 2

Outputssignal: 0/4...20 mA, max. burden 500 Ω or 0...10 V
Supply voltage: 24 Vac or 24 Vdc
Current consumption: approx. 100 mA
Case: plastic, white, wall mounting or mounting on a switch box
Dimensions: 75 x 127 x 25 mm (w x h x d)
Ambient temperature: 0...50 °C
Rel. humidity: 0...80 %, no condensation
Tolerancy: ± 4 % v.E. + 3 % v.M.


Additional product information

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