Table 2.
Laboratory test results of NO2 and CO sensors and POM on dry gas.
| Sensor | Equation | R2 | Lower Detection Limit |
|---|---|---|---|
| NO2-B4 (NO2) | Y = 1.08X − 15.14 | 0.99 | 6 ppb |
| CO-B4 (CO) | Y = 0.0026X − 0.99 | 0.99 | 0.02 ppm |
| POM (O3) | Y = 1.14X + 2.06 | 0.99 | 4 ppb |
Note: for NO2-B4, X is the sensor response voltage in mV, and Y is the concentration of the input NO2 gas in ppb; for CO-B4, X is the sensor response voltage in mV, and Y is the concentration of the input CO gas in ppm; for POM, X is the reading of POM in ppb, and Y is the concentration of the input O3 gas in ppb.