Not registered yet? Take advantages of registration:
Products saving in a binding to the projects
Online consultation from experts

Privacy policy

Blauberg CD-2

CO2 sensor.
EAN codeEAN4058448014413
  • Description
  • Downloads
  • Technical data
  • Sensor wiring diagram

Indoor carbon dioxide concentration measurement. Air flow control of the Vento and Freshbox ventilation units based on CO2 levels. Efficient energy saving device.


The sensor has two separate outputs, a normally opened dry relay contact and an analogue output 0–10 V that is adjustable fo 2–10 V/0–20 mA/4–20 mA. The relay output is used to turn the fan on/off depending on indoor CO2 concentration and the analogue output is used for smooth fan speed control for a fan with EC motor or a fan with extra speed controller with 0–10 V input. In case of smooth fan speed control the fan speed varies proportionally to carbon dioxide emissions. Due to the relay and analogue outputs the sensor is compatible with any ventilation system. The self-calibration system ensures reliable sensor operation during the sensor service life.


CD-1: integrated LED lights for indication of CO2 concentration and a touch button for operation mode switching (mode 1: on, mode 2: off, mode 3: operation according to CO2 concentration). The button is used to turn the fan on or turn it off when CO2-based ventilation is not required. CD-2: no integrated LED-lights and no touch button. This model is recommended for premises requiring permanent ventilation as school classes and other public premises.


Wall surface mounting. 24 VAC low current power supply. The sensor has a socket for AT power unit offered as an accessory (AT-220/25 or AT-120/25 models).

Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
CD-1/CD-2 - data sheet (pdf 208.61Kb)
CD-2 - user manual (pdf 279.47Kb)
CD-2 - image (png 292.74Kb)
Technical data
Technical data
Parameters Value
Power supply / Consumption 24 VAC (50 (60) Hz ± 10 %) / 24 VDC/1.6 W Max
Gas sensing element Non-dispersive infrared detector (NDIR) with self-calibration system
СО2-measuring range 0–2.000 ppm (parts per million)
Accuracy at 25 °C, 2.000 ppm ±30 ppm + 3 % of reading
Response time max. 2 min
Warm up time for each turning-on 2 hours (first time), 2 minutes (operation)
Analogue output 0–10 VDC (default), 4–20 mA selectable by jumpers
On/Off output 1×2A switch load Four set points selectable by jumpers
Operating conditions / Storage regulations 0–50 °C; 0–95 % RH non condensing / 0–50 °C
Weight / Dimensions 0.12 kg / 100 mm × 80 mm × 30 mm
Sensor wiring diagram
Sensor wiring diagram