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A capacitive CO2 sensor system with suppression of the humidity interference

Ein kapazitiver CO2 Sensor mit einer Unterdrückung der Feuchte-Querempfindlichkeit

White, N.M. ; Univ. of Southampton:
Eurosensors XII. Proceedings of the 12th European Conference
Bristol: IOP Publishing, 1998
ISBN: 0-7503-0536-3
ISBN: 0-7503-0536-3
Eurosensors <12, 1998, Southampton>
Conference Paper
Fraunhofer IFF ()
Fraunhofer IFT; 2000 dem IZM eingegliedert
CO2 sensor; heatable transducer; heteropolysiloxane; humidity interference; IDC transducer; indoor air quality; interdigital capacitor; monitoring; numerical suppression; sensor system

This paper presents a capacitive CO2 sensor system with an effective numerical suppression of the humidity interference. The system consists of an heatable Interdigital transducer with a CO2 indicator (heteropolysiloxane coating), a capacitive humidity sensor and (op-tional) a temperature sensor. The CO2 measurement range has a high resolution between from 100 - 3000 ppm CO2 and covers with a lower resolution 100 - 10000 ppm CO2 (twice TLV). These specifications follow the needs of ventilation systems (indoor air quality monitoring). The software algorithm for the humidity interference rejection can be scaled down to a microcontroller (i.e. 0851 family). The oral presentation was awarded with the conference's silver medal.