In this study, the repeatability, response time and linearity analysis of PID sensor (PID-AH), H₂S sensor (H₂S-B4) and MOS sensor (TGS2602) using iso-C4H8 and H₂S standard gas was performed for the development of real-time monitoring system of odor.
Three PID sensors, three H₂S sensors, and three MOS sensors were prepared for this study. The repeatability and response time were investigated by 0.5 ppm and 1.0 ppm standard gas, according to calibration specification for volatile organic compounds photo ionization detectors and verification regulation of sulfur hydrogen gas detectors applied in China. The analysis of linearity for standard sample gases of 7 concentrations calculated the coefficient of determination (R²) by the least square method.
The repeatability in measuring iso-C4H8 of three PID sensors (PID-AH) was about 0.2%, response time 10 seconds, and the coefficient of determination over 0.99.
The repeatability of three H₂S sensors (H₂S-B4) was at least 0.292% and at most 0.627%. The response time was about 60 seconds and the coefficient of determination was over 0.99.
The repeatability of the three MOS sensors (TGS2602) was at least 0.161% and at most 0.693%, and the response time is about 30 seconds on iso-C4H8 measurement and about 45 seconds on H₂S measurement.
Repeatability of PID sensor (PID-AH), electrochemical H₂S sensor (H₂S-B4) and MOS sensor (TGS2602) used in this study were reviewed by referring to the performance criteria used in China. The results of response time and linearity analysis was also satisfied the criteria applied in China.
So it is estimated that real-time odor monitoring system using sensors used in this study could be very helpful to manage odor in China and Korea.