Average Helium Flow Rates for Certified He leak Standards from Different Laboratories
| Certified He Flow Rate | Average Measured He Flow Rate (n = 5) | Relative Difference in % | Span |
|---|---|---|---|
| 6.80E-09 | 5.3E-09 | −29 | 0.19 |
| 1.30E-07 | 1.3E-07 | 0 | 0.00 |
| 3.30E-07 | 3.2E-07 | −2 | 0.03 |
| 1.50E-06 | 1.4E-06 | −6 | 0.09 |
| 1.90E-06 | 1.8E-06 | −3 | 0.02 |
| 5.31E-06 | 5.2E-06 | −2 | 0.03 |
| 1.67E-05 | 1.5E-05 | −9 | 0.01 |
| 2.40E-04 | 2.1E-04 | −15 | 0.02 |