Patented quality product (patent no. DE 10 2014 010 719.1)The maintenance-free microprocessor-controlled AERASGARD® KLQ is designed for duct installation and is used to detect the air quality or air quality based on a mixed gas sensor ⁄ VOC sensor. The measurement signals are converted to standard signals of 0 -10 V or 4...20 mA.It is used- For air quality measurement in offices, hotels, meeting rooms and convention centres, apartments, stores, and restaurants, etc.- For quantitative evaluation of room air pollution with contaminating gases (cigarette smoke, body perspiration, exhaled breathing air, solvent vapours, emissions from building members and cleaning agents)- For adjustable sensitivity regarding the maximum air contamination to be expected- For room ventilation as-needed, enabled by air changes only taking place when air is polluted while conserving energy at the same time.