Table 5.
Mean and standard deviations of nodes for gas module calibration.
| Parameters | Node No. 1 | Node No. 2 | Commercial Equivalent | |||
|---|---|---|---|---|---|---|
| Mean | STDEV | Mean | STDEV | Mean | STDEV | |
| Temperature (°C) | 26.42 | 1.09 | 26.4 | 1.12 | 26.36 | 1.06 |
| Humidity (%) | 62.7 | 2.08 | 62.93 | 2.31 | 62.98 | 2.13 |
| CH4 (ppm) | 545.66 | 23.54 | 543 | 25.99 | 544.8 | 24.68 |
| CO2 (ppm) | 684.46 | 81.76 | 689.46 | 80.78 | 689.2 | 83.47 |
| CO (ppm) | 22.24 | 1.49 | 22.14 | 1.59 | 22.25 | 1.51 |
| H2S (ppm) | 35.6 | 10.44 | 35.2 | 10.88 | 34.93 | 10.51 |
| SO2 (ppm) | 19.2 | 4.22 | 20.46 | 5.04 | 20 | 4.52 |
| NO2 (ppm) | 2.33 | 0.16 | 2.27 | 0.26 | 2.28 | 0.219 |