Thermo Scientific 43iQ, Instruction Manual

Page: 260 / 284

Optional Equipment
Internal Permeation Span Source
9-22 43iQ Instruction Manual Thermo Scientific
Figure 9–13. Installing Glass Tube pt 4
10. Latch oven cover handles.
The computation of SO
2
output level is shown in the following
information. Note that is assumed that all devices are properly calibrated
and that all flows are corrected to 25 °C and 1 atm.
Permeation Tube:
Q
(K) (R)
= (ppm) Output
o
Where:
R = permeation rate in ng/min
Q
0
= flow rate of gas (scc/min) into the charcoal scrubber during span mode
K = constant for the specific permeant = 24.45 / MW
MW = molecular weight
Computation of
Concentrations