Table 8 Uncertainty in sampling of SPM by HVS
Uncertainty components | Distribution | Calibration uncertainty reported in certificate | Standard uncertainty u(x) |
|---|---|---|---|
Uncertainty in flow rate of HVS at 95% confidence level | Normal; k = 2 (Type 'B') | 1.0 ± 0.2 (m3/minute) | 0.2/2 = 0.1 |
Uncertainty due to time (in minutes) recording by time tracker recorder at 95% confidence level | Normal; k = 2 (Type 'B') | 1.0 ± 0.05 (minute) | 0.05/2 = 0.025 |
Uncertainty in ambient pressure measurement at 95% confidence level | Normal; k = 2 (Type 'B') | 994.2 ± 0.6 (mbar) | 0.6/2 = 0.3 |
Uncertainty in measuring *temperature of the site at 95% confidence level | Normal; k = 2 (Type 'B') | 30 ± 3 (°C) | 3/2 = 1.5 |
- Combined uncertainty due to
