I have SCK 2.1 deployed outdoors in an industrial part of a city where TVOC and ECO2 values occasionally flat-line and, I assumed, max out. In referring to the AMS datasheet for CCS881 sensor (p. 12), I found the following:
• “The equivalent CO2 (eCO2) output range for CCS811 is from 400ppm up to 29206ppm. “
• “The equivalent Total Volatile Organic Compound (eTVOC) output range for CCS811 is from 0ppb up to 32768ppb.”
Yet, the max for my eCO2 is 32768ppb while the maximum value for eTVOC on my sensor is 29206 ppm. Furthermore, the minimum for my ECO2 is 400 ppm. At first I thought maybe the smart citizen web interface had values reversed, but it doesn’t appear to be that simple, as my EC02 range is 400ppm to 32678 ppm (not 0 – 32678 ppm nor 400 – 29206 ppm).
Do you have any idea whether this is a mistake on the datasheet or an issue in the smart citizen web interface?
While the 2 values are indeed, highly correlated, they do often peak at different times. As I am trying to relate their values to some other air quality data in the area, I’d just like to confirm the values on the web interface are indeed coming from their stated sensor. Thanks!