Sabio 2010D, Operation Manual

Page: 39 / 182

Installation Page 4-6
High Point = 9 PPM * 4.7 * 10-2
= 423 PPB
To calculate the permeation rate in ng/min for an SO2 permeation
tube, perform the following calculations:
FC 94 * 9
Permeation Rate, P = -- = ------
Km 0.382
= 2,214.7 ng/min
Where F = Permeation Oven Flow Rate, cc/min
C = Output Concentration, PPM
K = Molar Constant for SO2 from Figure 4-1
For this application a 2,215 ng/min at 40o C SO2 permeation tube
would be purchased.
Table 4-1 Common Molar Constants
Gas Formula Km
________________ ___________ ______
Ammonia NH3 1.439
Hydrogen Sulfide H2S 0.719
Nitrogen Dioxide NO2 0.532
Sulfur Dioxide SO2 0.382
If a gas blend is desired, similar calculations are required for
each of the blends.
For further information, please contact the factory.