15.APPENDIX E: CALCULATION OF DYNACALIBRATOR H2S CONCENTRATION
UNIT DEFINITIONS mole / 6.02@1023 molecules
nanogram (ngm) = gm 10 9
PPMv /
CALCULATIONS
| (molar volume @ 25 oC) ∗ (tube permeation rate) |
|
|
| (molecular weight of H 2S) |
| = PPM volume/volume |
| (total gas flow rate) |
| |
|
|
|
| | ∗ |
|
|
|
| ltr |
|
|
|
|
| ||||
| 24.45 |
|
|
|
|
| | |
|
| | |||||
|
|
|
|
|
|
|
| |||||||||
| |
|
|
|
| mole | | |
|
| ngm | |||||
|
|
|
|
|
|
|
|
| ∗ | 5090∗ | | |||||
| |
|
|
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
| gm | |
|
| min | |||||
| 34.07 | ∗ |
|
|
|
| | |
|
| | |||||
|
|
|
|
|
|
|
|
|
| |||||||
| |
|
|
|
|
| mole |
|
|
|
| = 0.512 PPMv | ||||
|
|
|
| | 7138∗ | ml |
| |||||||||
|
|
|
|
|
| |||||||||||
|
|
|
| |
|
| |
|
| |||||||
|
|
|
|
|
|
|
| |||||||||
|
|
|
| |
|
|
|
| min |
|
|
Mole units divide out, as do mass units, leaving volume per minute in both the numerator and the denominator. This leaves a unitless quantity scaled by 1 x 106 in the denominator that is the definition of PPM.
Page 48 of 50 | AZI Customer Service |