Ventilation Technology

Improvement of a developed air quality sensor by means of field testing

The project's aim is to reduce the energy consumption of indoor air control systems by using air quality sensors to adjust operation to the air quality. To this end, the researchers optimise the sensor properties of an already developed air quality sensor through field testing and improve the control technology.


Utilisation of air quality sensors can guarantee a pleasant indoor climate and appropriate indoor air quality at substantially reduced energy consumption. The sensors serve to record the air components within a room and contribute to a requirements-controlled optimisation of climate control.

This sub-project examined the capacity of the air quality sensor developed by the "Luqas" research collaboration for quantitative recording of individual indoor-air components. To this end, the seven fire gases CO2, CO, NH3, acetone, VOC and water vapour were selected as quality markers and indicators for various relevant indoor emitters.

Certain weaknesses, such as measurement signal fluctuations under humidity variation and changing flow rates, were to be eliminated. Furthermore, the air quality sensors in all flow areas were to be linked with the respective motors in order to create a control system that further optimises indoor air quality and energy consumption.


  • Unlike their predecessors, the third-generation sensors displayed no susceptibility to changes in indoor humidity and temperature.
  • The influx flow rate of the room air, supply air or exhaust air no longer affected the sensor's output signal. The sensor can thus be employed in any flow area, i.e. both in turbulent air flows as well as in low-turbulence flows.
  • Fifth-generation sensors can be installed even in ducts with small pipe diameters without problem.
  • At identical load, the absolute signal changes and the signal changes expressed in percent of the output signal are equal.
  • The sensors react very rapidly to changes in concentrations.

Project Participants

Implementing Institutions

Caverion Deutschland GmbH, Krantz Komponenten

Cooperation Partner

UST Umweltsensortechnik GmbH

Universität Essen, Institut für Thermodynamik und Klimatechnik (IATK)

Eurem GmbH

ETR Elektronik Technologie Rump GmbH

More Project Information

Project number: 0329795D

Project period: 1997 - 2001

Project region: Germany (North Rhine-Westphalia)

Project contact:

Herr Dipl. Ing. Wetzel

View Publication

Source: German National Library of Science and Technology Hannover (TIB)