Sabio 2010D - Page 39

Installation Page 4-
6
High Point = 9 PPM * 4.7 * 10
-2
= 423 PPB
To calculate the permeation rate in ng/min for an SO
2
permeation
tube, perform the following calculations:
FC 94 * 9
Permeation Rate, P = -- = ------
K
m
0.382
= 2,214.7 ng/min
Where F = Permeation Oven Flow Rate, cc/min
C = Output Concentration, PPM
K = Molar Constant for SO
2
from Figure 4-1
For this application a 2,215 ng/min at 40
o
C SO
2
permeation tube
would be purchased.
Table 4-1 Common Molar Constants
Gas Formula K
m
________________ ___________ ______
Ammonia NH
3
1.439
Hydrogen Sulfide H
2
S 0.719
Nitrogen Dioxide NO
2
0.532
Sulfur Dioxide SO
2
0.382
If a gas blend is desired, similar calculations are required for
each of the blends.
For further information, please contact the factory.