Multifunctional CO2 transmitters for building automation systems

Siro-CO2 is a carbon dioxide transmitter with a modern design and new hardware, including sensors. The transmitter combines CO2 concentration, temperature and optional relative humidity and VOC measurements into one easy-to-use device. It offers easy installation and adjustment, several different model options and various output signals that are configurable separately for each measurement parameter. Siro-CO2 utilizes the industry standard NDIR measurement principle with self-calibrating ABC logic™ for CO2 measurement.

Available in Q1/2021.


Technical details

Measuring units: CO2 ppm, °C
Optional measuring units: % rH, VOC ppm
Calibration: Automatic self-calibration, ABC LogicTM
Supply voltage: 24 VDC/VAC ±10 %
Output signal 1: 0…10 V (linear to CO2) or optional 4…20 mA (linear to CO2)
Output signal 2: 0…10 V (linear to Temp) or optional 4…20 mA (linear to Temp)
Optional output signal 3: 0…10 V (linear to rH) or optional 4…20 mA (linear to rH)
Optional output signal 4: 0…10 V (linear to VOC) or optional 4…20 mA (linear to VOC)
Operating temperature: 0...+50 °C
Protection standard: IP20




Product series

Carbon dioxide transmitter

VOC sensor

With VOC sensor
Without VOC sensor

Relative humidity sensor

With relative humidity sensor
Without relative humidity sensor (option not available with VOc sensor)


Voltage output
Voltage and current output


With display
Without display

Other Carbon dioxide transmitters: