VICI D-2-I - Manual (Page 16)

12
GC Column Selection
To prevent detector contamination, we strongly recom-
mend disconnecting the column from the detector dur-
ing column bakeout procedures.
PD-D2
The PD-D2 is optimized for packed columns with OD of 1/16" or less. Some
of the stationary phases may not be compatible due to higher column bleed,
manifesting in high detector background current. If you must use a packed
column or a metal or metal-coated fused silica capillary column, consult the
factory for more information.
Best detector performance is obtained with bonded phase fused silica
capillary columns with an ID between 0.25 - 0.32 mm. Megabore columns
can be used, but the column flow rate should not exceed 15 mL/min.
Excessive column flow rates may allow diffusion of the analytes into the
discharge region.
PD-D2-IS
The PD-D2-IS is optimized for 1/8" packed columns. The column tubing
must be thoroughly cleaned and baked before the column is packed. Even
when the best care is taken in column tubing cleaning and in the support
and stationary phase selection, a new column will often bleed compounds,
resulting in a considerable increase in the detector baseline. This initial
bleed will usually be reduced to acceptable levels after the column is con-
ditioned with clean carrier gas flow for several hours at the recommended
bakeout temperature.
The PD-D2-IS can also be used with megabore columns.
System Requirements