carbon dioxide transmitters




CDT2000 combines CO2 concentration, temperature and optional relative humidity measurements into one easy-to-use device with a touchscreen display. It offers easy installation and adjustment, several different model options and various output signals that are configurable separately for each measurement parameter. CDT2000 utilizes the industry standard NDIR measurement principle with self-calibrating ABC logic™ for CO2 measurement. CDT2000-DC is a dual channel model with a measuring channel and a reference channel that makes a continuous comparison and the necessary adjustment accordingly. CDT2000-DC is also suitable for buildings that are continuously occupied.



CDT2000 wall mount model is used to monitor and control CO2 and humidity levels in offices, public spaces, meeting rooms and classrooms. CDT2000-DC series devices can also be used in applications where there is a constant source of carbon dioxide present (for example hospitals and greenhouses).

Technical Specifications


Measuring units:



Supply voltage:


Output signal 1:

Optional output signal 2:


Output signal 3:

Optional relay output:

Operating temperature:


Protection standard:

CO2: ±40 ppm + 2 % of reading, DC model: 75 ppm or 10 % of reading (whichever is greater)

Temperature: <0.5 °C

Relative humidity: ±2…3 % rH at 0…50 °C and 10…90 % rH

Total error band includes accuracy, hysteresis and temperature effect over 5...50 °C and 10–90 % rH

ppm, °C, % rH

Automatic self-calibration, ABC LogicTM or continuous comparison (DC)

24 VDC/VAC ±10 %

0/2…10 V or 4…20 mA (linear to CO2)

0/2…10 V or 4…20 mA (linear to rH)

0/2…10 V or 4…20 mA (linear to Temp)

Potential free SPDT 250 VAC, 6 A / 30 VDC, 6 A with adjustable switching point and hysteresis

0…+50 °C