Teledyne 6400EH - Sulfur Dioxide Analyzer - Manual (Page 51)

UV Fluorescence SO2 Analyzer Theory of Operation
Teledyne Analytical Instruments 39
 On the other hand the typical 6400EH application often includes
much higher concentrations of Nitric Oxide (NO), which
fluoresces in a spectral range near that of SO
2
. Therefore a 360
nm filter replaces the 330nm UV filter located between the PMT
and the reaction cell in order to more efficiently reject for
interference due to the higher concentrations of NO.
9.2 Pneumatic Operation
9.2.1 Sample Gas Flow
The flow of gas through the 6400EH UV Fluorescence SO
2
Analyzer is created by a small external pump that pulls air through the
instrument. The 6400EH has no kicker to scrub hydrocarbons from the
sample stream. Typical applications for the 6400EH do not have
hydrocarbons in the sample stream.
Figure 9-2: Pneumatic Diagram of the6400EH – Base
Configuration