Calibration Transfer Among Sensor Arrays Designed for Monitoring Volatile Organic Compounds in Indoor Air Quality

Sensor arrays were constructed using commercially available heated tin oxide sensors (Figaro TGS2602) and exposed to a wide variety of volatile organic compounds (VOCs) in air streams at concentration levels in the range of 0.01-0.30 ppm, which is a range typical of indoor air quality studies. Partial least squares calibration models were developed using steady-state sensor array responses. These calibration models were used to detect, differentiate, and quantify different VOCs. The authors were able to successfully transfer single-component calibrations by sorting the sensors in each array by sensitivity prior to transfer. Future work will explore multicomponent calibration transfer.