VICI TCD2 - Manual (Page 12)

8
2 13 ⁄
16
"
5 5
⁄
8 "
1 1
⁄
4
"
3"
6"
1 1
⁄
2
"
1"
Figure 5: Detector assembly mounting dimensions
However, while nitrogen as a carrier yields excellent response to hydrogen,
the response to oxygen and carbon dioxide is diminished compared to the
levels that could be achieved with helium or hydrogen. Argon would yield
poor response to carbon dioxide and water, but would be adequate for other
components.
There is no absolute “best choice” of carrier gas. For any situation, the choice
must take into account all of the parameters involved: column
characteristics, components of interest and their concentrations, safety
considerations, carrier cost, etc.
GC Column Selection
Cell volume has been minimized to accommodate capillary, megabore, and
micropacked columns, and to optimize the sensitivity of the detector at low
flow rates. However, standard packed columns may also be used if sensitiv-
ity is not an issue.
System Requirements