Agilent Technologies 8255 Nitrogen, User Manual, Page: 39 / 118

System Description
3
SCD and NCD User Manual 39
Description of Major Components
Burner assembly
The burner assembly mounts on top of the GC in a detector
location, and contains the column connection.
For the SCD, the burner provides two heated zones, one at the
base and one farther up the assembly. In the burner base region,
the column effluent mixes with the lower hydrogen flow and air
at high temperature. The resulting hydrogen flame combusts the
effluent. Low concentration components burn to form the usual
combustion products, including SO
2
for compounds containing
sulfur. The products are drawn upward through a ceramic tube,
where at even higher temperature the upper hydrogen flow
mixes with the combustion products, causing the SO
2
to reduce
into SO.
Figure 6 shows the flow paths for the SCD burner assembly.