RLQ-CO2 Room air quality and CO2 sensor

Room air quality and CO2 sensor

Power supply 24 V AC/DC, output 2x 0..10 V ~ 0..2000 ppm (CO2, optical sensor NDIR), 100..0% AQ referred to calibration gas (quality, sensor VOC), IP30


The microprocessor-controlled RLQ-CO2 sensor with autocalibration is used to detect the air quality regarding VOC. The CO2 content in the air is determined by a two-ray NDIR sensor (non-dispersive infrared technology) in the range of 0...2000 ppm, 0...5000 ppm or 0...10000 ppm. The output signal is proportional, 0...10 V DC.

  • Quantitative assesment of air pollution in rooms with contaminating gases (cigarette smoke, body odour, exhaled breathing air, emission from detergents and building materials).
  • For demand-based ventilation controls in those rooms.

To measure the CO2 concentration, a non-dispersive infrared (NDIR) sensor is used. 

Room air quality is to be understood as subjective air quality felt by human beings with their olfactory organs. As perception varies from person to person, no general definition of air quality is available. The air quality sensor does not trace concentration of any individual gas; it assesses the mixed gas and thus it is not possible to specify gas concentrations in the ppm units. A broadband VOC (volatile organic compounds) sensor is used to provide as universal value as possible. 

Detectable gases: Mixed gas, vapours of alkanoles, automobile exhaust gases, exhaled breathing air, combustion smoke (from wood, paper, plastics). The sensor can be reset by means of zero point and final value potentiometers.

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