Teledyne 6400EH - Sulfur Dioxide Analyzer - Manual (Page 35)

UV Fluorescence SO2 Analyzer Optional Hardware/Software
Teledyne Analytical Instruments 23
Figure 5-3: Hydrocarbon Scrubber (Kicker) – OPT 65
The scrubbed air from the inner tube is returned to be used as the
purge gas in the outer tube after it passes through the analyzers reaction
cell. This means that when the analyzer is first started, the concentration
gradient between the inner and outer tubes is small and the scrubber’s
efficiency is relatively low. When the instrument is turned on after
having been off for more than 30 minutes, it takes a certain amount of
time for the gradient to become large enough for the scrubber to
adequately remove hydrocarbons from the sample air.
Figure 5-4: 6400EH Internal Pneumatic Diagram with
Hydrocarbon Scrubber Installed